课程代码仓库初始化：Part1 (144) + Part3 (29) 全量生成与验证
把川大 wiki「02.Qt方向」课程代码整理为 CMake 管理的可编译运行项目。
Part1 C/C++ 强化 (p01/, 144 目标, host gcc/g++ 构建, 全绿):
- 修复全部编译失败：补 <cstring>/<fstream>/<iomanip>/<vector> 等缺失头
(common_fix + infer_stl_includes 自动检测注入)、修正 pause() 壳注入
(改检测已转换后的 pause 调用)、namespace 提升出函数体、const 成员函数
正确性、dedupe 不再破坏函数重载集、K&R 隐式 int / 动态异常规范等
C++17 移除特性的可编译等价改写。
- 目录采用深缩写 p01/ch04/s03/ (原 part1_cpp/ch04_class_object/03_ctor_dtor)。
Part3 Qt 桌面 (p03/, 29 目标, 隔离 Qt 5.14.2 构建, 全绿):
- gen_part3.py: Qt 外壳模板 (main+QApplication+show, QTimer 自动退出便于
offscreen 验证)、AUTOMOC + .moc include、rewrite_* 处理散文混入/重载/
资源依赖、生成占位 png/gif + .qrc + rundata 样例数据。
- 修正 QLable 笔误、全角分号、.→->、Windows 路径、QApplication 阻塞事件
循环改为 QCoreApplication 等。
任务1 概念/版本验证:
- tools/std_probe.py: 跨 -std= 编译探针 (--pedantic-errors 让已废除特性硬失败)。
- tools/demo_versions/: K&R 隐式 int、三目左值、void* 转换、enum 赋整、
const 经指针、动态异常规范 共 6 个跨版本演示。
- docs/VERSION_NOTES.md: 每条「原文说法→C17/C++17 是否成立→何版本成立→已验证」。
文档: 顶层 README、docs/SOURCE_PAGES.md (页面→目录映射)、
docs/ERRATA.md (Part1 修正)、docs/ERRATA_part3.md (Part3 修正)。
另修复 tools/run.sh / run_qt.sh 的 ${1:?...} 引号语法 bug。
隔离 Qt 验证: ldd 0 系统 Qt 引用; 173/173 目标全绿; p03 offscreen 运行通过。
This commit is contained in:
张宗平
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# Auto-generated by tools/gen_part1.py
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# Auto-generated by tools/gen_part1.py — do not edit by hand.
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# 章节：p01/ch02
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// ============================================================================
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// p1c02_01 — 2.1.1 c++ hello world
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// 来源：川大 C++/LinuxC wiki「02.Qt方向」
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// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
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// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
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// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
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// ============================================================================
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#include <iostream>
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using namespace std;
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// --- 原文片段 [58954438:0] 2.1.1 c++ hello world ---
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#include<iostream>
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using namespace std;
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int main(){
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cout << "hello world" << endl;
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return EXIT_SUCCESS;
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}
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// --- main ---
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# 章节：p01/ch03
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|
||||
set_target_properties(p1c03_42 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c03_42 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c03_43 function_overload_basics_2.cpp)
|
||||
set_target_properties(p1c03_43 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c03_43 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c03_43 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c03_44 function_overload_mechanism.cpp)
|
||||
set_target_properties(p1c03_44 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c03_44 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c03_44 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c03_45 extern_c.cpp)
|
||||
set_target_properties(p1c03_45 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c03_45 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c03_45 PRIVATE -Wall -Wextra)
|
||||
add_custom_target(all_p01_ch03 DEPENDS p1c03_mymodule p1c03_01 p1c03_02 p1c03_03 p1c03_04 p1c03_05 p1c03_06 p1c03_07 p1c03_08 p1c03_09 p1c03_10 p1c03_11 p1c03_12 p1c03_13 p1c03_14 p1c03_15 p1c03_16 p1c03_17 p1c03_18 p1c03_19 p1c03_20 p1c03_21 p1c03_22 p1c03_23 p1c03_24 p1c03_25 p1c03_26 p1c03_27 p1c03_28 p1c03_29 p1c03_30 p1c03_31 p1c03_32 p1c03_33 p1c03_34 p1c03_35 p1c03_36 p1c03_37 p1c03_38 p1c03_39 p1c03_40 p1c03_41 p1c03_42 p1c03_43 p1c03_44 p1c03_45)
|
||||
@@ -0,0 +1,23 @@
|
||||
// ============================================================================
|
||||
// p1c03_18 — 3.7 “新增”bool类型关键字
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:17] 3.7 “新增”bool类型关键字 ---
|
||||
void test()
|
||||
{ cout << sizeof(false) << endl; //为1，//bool类型占一个字节大小
|
||||
bool flag = true; // c语言中没有这种类型
|
||||
flag = 100; //给bool类型赋值时，非0值会自动转换为true(1),0值会自动转换false(0)
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,30 @@
|
||||
// ============================================================================
|
||||
// p1c03_22 — 3.8.2.3 C/C++中const异同总结
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
|
||||
// --- 原文片段 [58954439:21] 3.8.2.3 C/C++中const异同总结 ---
|
||||
static void block_0() {
|
||||
const int constA = 10;
|
||||
|
||||
int* p = (int*)&constA;
|
||||
|
||||
*p = 300;
|
||||
|
||||
printf("constA:%d\n",constA);
|
||||
|
||||
printf("*p:%d\n", *p);
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
block_0();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,19 @@
|
||||
// ============================================================================
|
||||
// p1c03_21 — 3.8.2.3 C/C++中const异同总结
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:20] 3.8.2.3 C/C++中const异同总结 ---
|
||||
const int constA = 10;
|
||||
int main(){
|
||||
int* p = (int*)&constA;
|
||||
*p = 200;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,25 @@
|
||||
// ============================================================================
|
||||
// p1c03_23 — 3.8.2.3 C/C++中const异同总结
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:22] 3.8.2.3 C/C++中const异同总结 ---
|
||||
static void block_0() {
|
||||
const int constA = 10;
|
||||
int* p = (int*)&constA;
|
||||
*p = 300;
|
||||
cout << "constA:" << constA << endl;
|
||||
cout << "*p:" << *p << endl;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
block_0();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,26 @@
|
||||
// ============================================================================
|
||||
// p1c03_24 — 3.8.2.3 C/C++中const异同总结
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:23] 3.8.2.3 C/C++中const异同总结 ---
|
||||
static void block_0() {
|
||||
int b = 10;
|
||||
const int constA = b;
|
||||
int* p = (int*)&constA;
|
||||
*p = 300;
|
||||
cout << "constA:" << constA << endl;
|
||||
cout << "*p:" << *p << endl;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
block_0();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,29 @@
|
||||
// ============================================================================
|
||||
// p1c03_25 — 3.8.2.3 C/C++中const异同总结
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:24] 3.8.2.3 C/C++中const异同总结 ---
|
||||
static void block_0() {
|
||||
class Person { public: int age = 0; };
|
||||
const Person person; //未初始化age
|
||||
//person.age = 50; //不可修改
|
||||
Person* pPerson = (Person*)&person;
|
||||
//指针间接修改
|
||||
pPerson->age = 100;
|
||||
cout << "pPerson->age:" << pPerson->age << endl;
|
||||
pPerson->age = 200;
|
||||
cout << "pPerson->age:" << pPerson->age << endl;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
block_0();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,33 @@
|
||||
// ============================================================================
|
||||
// p1c03_35 — 3.10.5 常量引用
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:34] 3.10.5 常量引用 ---
|
||||
void test01(){
|
||||
int a = 100;
|
||||
const int& aRef = a; //此时aRef就是a
|
||||
//aRef = 200; 不能通过aRef的值
|
||||
a = 100; //OK
|
||||
cout << "a:" << a << endl;
|
||||
cout << "aRef:" << aRef << endl;
|
||||
}
|
||||
void test02(){
|
||||
//不能把一个字面量赋给引用
|
||||
//int& ref = 100;
|
||||
//但是可以把一个字面量赋给常引用
|
||||
const int& ref = 100; //int temp = 200; const int& ret = temp;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test01();
|
||||
test02();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,21 @@
|
||||
// ============================================================================
|
||||
// p1c03_36 — 3.10.5 常量引用
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:35] 3.10.5 常量引用 ---
|
||||
//const int& param防止函数中意外修改数据
|
||||
void ShowVal(const int& param){
|
||||
cout << "param:" << param << endl;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,27 @@
|
||||
// ============================================================================
|
||||
// p1c03_26 — 3.9.3 尽量以const替换#define
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:25] 3.9.3 尽量以const替换#define ---
|
||||
#define PARAM 128
|
||||
|
||||
const short param = 128;
|
||||
|
||||
void func_1(short a){
|
||||
cout << "short!" << endl;
|
||||
}
|
||||
void func_1(int a){
|
||||
cout << "int" << endl;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,29 @@
|
||||
// ============================================================================
|
||||
// p1c03_27 — 3.9.3 尽量以const替换#define
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:26] 3.9.3 尽量以const替换#define ---
|
||||
void func1(){
|
||||
const int a = 10;
|
||||
#define A 20
|
||||
//#undef A //卸载宏常量A
|
||||
}
|
||||
|
||||
void func2(){
|
||||
//cout << "a:" << a << endl; //不可访问，超出了const int a作用域
|
||||
cout << "A:" << A << endl; //#define作用域从定义到文件结束或者到#undef，可访问
|
||||
}
|
||||
|
||||
int main(){
|
||||
func2();
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,27 @@
|
||||
// ============================================================================
|
||||
// p1c03_28 — 3.9.3 尽量以const替换#define
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:27] 3.9.3 尽量以const替换#define ---
|
||||
namespace MySpace{
|
||||
#define num 1024
|
||||
}
|
||||
|
||||
void test(){
|
||||
//cout << MySpace::NUM << endl; //错误
|
||||
//int num = 100; //命名冲突
|
||||
cout << num << endl;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,34 @@
|
||||
// ============================================================================
|
||||
// p1c03_40 — 3.12 函数的默认参数
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:39] 3.12 函数的默认参数 ---
|
||||
void TestFunc01(int a = 10, int b = 20){
|
||||
cout << "a + b = " << a + b << endl;
|
||||
}
|
||||
//注意点:
|
||||
//1. 形参b设置默认参数值，那么后面位置的形参c也需要设置默认参数
|
||||
void TestFunc02(int a,int b = 10,int c = 10){}
|
||||
//2. 如果函数声明和函数定义分开，函数声明设置了默认参数，函数定义不能再设置默认参数
|
||||
void TestFunc03(int a = 0,int b = 0);
|
||||
void TestFunc03(int a, int b){}
|
||||
|
||||
int main(){
|
||||
//1.如果没有传参数，那么使用默认参数
|
||||
TestFunc01();
|
||||
//2. 如果传一个参数，那么第二个参数使用默认参数
|
||||
TestFunc01(100);
|
||||
//3. 如果传入两个参数，那么两个参数都使用我们传入的参数
|
||||
TestFunc01(100, 200);
|
||||
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,48 @@
|
||||
// ============================================================================
|
||||
// p1c03_45 — 3.14.3 extern “C”浅析
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:46] 3.14.3 extern “C”浅析 ---
|
||||
#define _CRT_SECURE_NO_WARNINGS
|
||||
#include<iostream>
|
||||
using namespace std;
|
||||
|
||||
#if 0
|
||||
|
||||
#ifdef __cplusplus
|
||||
extern "C" {
|
||||
#if 0
|
||||
void func1();
|
||||
int func2(int a, int b);
|
||||
#else
|
||||
#include"MyModule.h"
|
||||
#endif
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
#else
|
||||
|
||||
extern "C" void func1();
|
||||
extern "C" int func2(int a, int b);
|
||||
|
||||
#endif
|
||||
|
||||
int main(){
|
||||
func1();
|
||||
cout << func2(10, 20) << endl;
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
// --- 为使本示例作为独立目标可链接，就地提供 func1/func2 的 extern "C" 定义 ---
|
||||
// （原文仅声明；定义在配对的 MyModule.c。此处补最小实现以自洽编译运行。）
|
||||
extern "C" void func1(){ printf("hello world!"); }
|
||||
extern "C" int func2(int a, int b){ return a + b; }
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,13 @@
|
||||
// 58954439:45 — MyModule 实现文件（与 my_module.h 配对）
|
||||
// 由 gen_part1.py 成对输出。
|
||||
|
||||
#include"my_module.h"
|
||||
#include <stdlib.h>
|
||||
|
||||
void func1(){
|
||||
printf("hello world!");
|
||||
}
|
||||
int func2(int a, int b){
|
||||
return a + b;
|
||||
}
|
||||
int main(){ func1(); printf("func2=%d\n", func2(3,4)); return EXIT_SUCCESS; }
|
||||
@@ -0,0 +1,37 @@
|
||||
// ============================================================================
|
||||
// p1c03_42 — 3.14.2.1 函数重载基本语法
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:41] 3.14.2.1 函数重载基本语法 ---
|
||||
namespace A{
|
||||
void MyFunc(){ cout << "无参数!" << endl; }
|
||||
void MyFunc(int a){ cout << "a: " << a << endl; }
|
||||
void MyFunc(string b){ cout << "b: " << b << endl; }
|
||||
void MyFunc(int a, string b){ cout << "a: " << a << " b:" << b << endl;}
|
||||
void MyFunc(string b, int a){ cout << "a: " << a << " b:" << b << endl;}
|
||||
}
|
||||
namespace B{
|
||||
void MyFunc(string b, int a){}
|
||||
//int MyFunc(string b, int a){} //无法重载仅按返回值区分的函数
|
||||
}
|
||||
void test(){
|
||||
A::MyFunc();
|
||||
A::MyFunc(10);
|
||||
A::MyFunc("hello");
|
||||
A::MyFunc(10, "world");
|
||||
A::MyFunc("world", 10);
|
||||
B::MyFunc("ok", 1);
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,27 @@
|
||||
// ============================================================================
|
||||
// p1c03_43 — 3.14.2.1 函数重载基本语法
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:42] 3.14.2.1 函数重载基本语法 ---
|
||||
void MyFunc(string b){
|
||||
cout << "b: " << b << endl;
|
||||
}
|
||||
//函数重载碰上默认参数
|
||||
void MyFunc(string b, int a = 10){
|
||||
cout << "a: " << a << " b:" << b << endl;
|
||||
}
|
||||
int main(){
|
||||
// MyFunc("hello"); // 二义：MyFunc(string) 与 MyFunc(string,int=10) 同等匹配
|
||||
// MyFunc(string("hello")); // 仍二义：强转 string 也无法区分两候选
|
||||
MyFunc("hello", 20); // 显式给第二参 → 明确选双参重载
|
||||
return 0;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,20 @@
|
||||
// ============================================================================
|
||||
// p1c03_44 — 3.14.2.2 函数重载实现原理
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:43] 3.14.2.2 函数重载实现原理 ---
|
||||
void func(){}
|
||||
void func(int x){}
|
||||
void func(int x,char y){}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,22 @@
|
||||
// ============================================================================
|
||||
// p1c03_14 — 3.3 全局变量检测增强
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
|
||||
// --- 原文片段 [58954439:13] 3.3 全局变量检测增强 ---
|
||||
int a = 10; //赋值，当做定义
|
||||
int a; //没有赋值，当做声明
|
||||
|
||||
int main(){
|
||||
printf("a:%d\n",a);
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,22 @@
|
||||
// ============================================================================
|
||||
// p1c03_39 — 3.11.3.2 类内部的内联函数
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:38] 3.11.3.2 类内部的内联函数 ---
|
||||
class Person{
|
||||
public:
|
||||
Person(){ cout << "构造函数!" << endl; }
|
||||
void PrintPerson(){ cout << "输出Person!" << endl; }
|
||||
};
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,28 @@
|
||||
// ============================================================================
|
||||
// p1c03_37 — 3.11.2 预处理宏的缺陷
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:36] 3.11.2 预处理宏的缺陷 ---
|
||||
#define ADD(x,y) x+y
|
||||
inline int Add(int x,int y){
|
||||
return x + y;
|
||||
}
|
||||
void test(){
|
||||
int ret1 = ADD(10, 20) * 10; //希望的结果是300
|
||||
int ret2 = Add(10, 20) * 10; //希望结果也是300
|
||||
cout << "ret1:" << ret1 << endl; //210
|
||||
cout << "ret2:" << ret2 << endl; //300
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,28 @@
|
||||
// ============================================================================
|
||||
// p1c03_38 — 3.11.2 预处理宏的缺陷
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:37] 3.11.2 预处理宏的缺陷 ---
|
||||
#define COMPARE(x,y) ((x) < (y) ? (x) : (y))
|
||||
int Compare(int x,int y){
|
||||
return x < y ? x : y;
|
||||
}
|
||||
void test02(){
|
||||
int a = 1;
|
||||
int b = 3;
|
||||
//cout << "COMPARE(++a, b):" << COMPARE(++a, b) << endl; // 3
|
||||
cout << "Compare(int x,int y):" << Compare(++a, b) << endl; //2
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test02();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,17 @@
|
||||
#ifndef MYMODULE_H
|
||||
#define MYMODULE_H
|
||||
|
||||
#include<stdio.h>
|
||||
|
||||
#if __cplusplus
|
||||
extern "C"{
|
||||
#endif
|
||||
|
||||
void func1();
|
||||
int func2(int a,int b);
|
||||
|
||||
#if __cplusplus
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif
|
||||
@@ -0,0 +1,28 @@
|
||||
// ============================================================================
|
||||
// p1c03_03 — 3.2.2命名空间使用语法
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:2] 3.2.2命名空间使用语法 ---
|
||||
namespace A{
|
||||
int a = 10;
|
||||
}
|
||||
namespace B{
|
||||
int a = 20;
|
||||
}
|
||||
void test(){
|
||||
cout << "A::a : " << A::a << endl;
|
||||
cout << "B::a : " << B::a << endl;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,28 @@
|
||||
// ============================================================================
|
||||
// p1c03_04 — 3.2.2命名空间使用语法
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:3] 3.2.2命名空间使用语法 ---
|
||||
namespace A{
|
||||
int a = 10;
|
||||
}
|
||||
namespace B{
|
||||
int a = 20;
|
||||
}
|
||||
void test(){
|
||||
cout << "A::a : " << A::a << endl;
|
||||
cout << "B::a : " << B::a << endl;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,28 @@
|
||||
// ============================================================================
|
||||
// p1c03_05 — 3.2.2命名空间使用语法
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:4] 3.2.2命名空间使用语法 ---
|
||||
namespace A{
|
||||
int a = 10;
|
||||
namespace B{
|
||||
int a = 20;
|
||||
}
|
||||
}
|
||||
void test(){
|
||||
cout << "A::a : " << A::a << endl;
|
||||
cout << "A::B::a : " << A::B::a << endl;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,32 @@
|
||||
// ============================================================================
|
||||
// p1c03_06 — 3.2.2命名空间使用语法
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:5] 3.2.2命名空间使用语法 ---
|
||||
namespace A{
|
||||
int a = 10;
|
||||
}
|
||||
|
||||
namespace A{
|
||||
void func(){
|
||||
cout << "hello namespace!" << endl;
|
||||
}
|
||||
}
|
||||
|
||||
void test(){
|
||||
cout << "A::a : " << A::a << endl;
|
||||
A::func();
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,21 @@
|
||||
// ============================================================================
|
||||
// p1c03_07 — 3.2.2命名空间使用语法
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:6] 3.2.2命名空间使用语法 ---
|
||||
namespace MySpace{
|
||||
void func1();
|
||||
void func2(int param);
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,32 @@
|
||||
// ============================================================================
|
||||
// p1c03_08 — 3.2.2命名空间使用语法
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:7] 3.2.2命名空间使用语法 ---
|
||||
namespace MySpace{
|
||||
void func1();
|
||||
void func2(int param);
|
||||
}
|
||||
void MySpace::func1(){
|
||||
cout << "MySpace::func1" << endl;
|
||||
}
|
||||
void MySpace::func2(int param){
|
||||
cout << "MySpace::func2 : " << param << endl;
|
||||
}
|
||||
void test(){
|
||||
MySpace::func1();
|
||||
MySpace::func2(42);
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,26 @@
|
||||
// ============================================================================
|
||||
// p1c03_09 — 3.2.2命名空间使用语法
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:8] 3.2.2命名空间使用语法 ---
|
||||
namespace{
|
||||
int a = 10;
|
||||
void func(){ cout << "hello namespace" << endl; }
|
||||
}
|
||||
void test(){
|
||||
cout << "a : " << a << endl;
|
||||
func();
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,30 @@
|
||||
// ============================================================================
|
||||
// p1c03_10 — 3.2.2命名空间使用语法
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:9] 3.2.2命名空间使用语法 ---
|
||||
namespace veryLongName{
|
||||
|
||||
int a = 10;
|
||||
void func(){ cout << "hello namespace" << endl; }
|
||||
}
|
||||
|
||||
void test(){
|
||||
namespace shortName = veryLongName;
|
||||
cout << "veryLongName::a : " << shortName::a << endl;
|
||||
veryLongName::func();
|
||||
shortName::func();
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,36 @@
|
||||
// ============================================================================
|
||||
// p1c03_41 — 3.13 函数的占位参数
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:40] 3.13 函数的占位参数 ---
|
||||
void TestFunc01(int a,int b,int){
|
||||
//函数内部无法使用占位参数
|
||||
cout << "a + b = " << a + b << endl;
|
||||
}
|
||||
//占位参数也可以设置默认值
|
||||
void TestFunc02(int a, int b, int = 20){
|
||||
//函数内部依旧无法使用占位参数
|
||||
cout << "a + b = " << a + b << endl;
|
||||
}
|
||||
int main(){
|
||||
|
||||
//错误调用，占位参数也是参数，必须传参数
|
||||
//TestFunc01(10,20);
|
||||
//正确调用
|
||||
TestFunc01(10,20,30);
|
||||
//正确调用
|
||||
TestFunc02(10,20);
|
||||
//正确调用
|
||||
TestFunc02(10, 20, 30);
|
||||
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,41 @@
|
||||
// ============================================================================
|
||||
// p1c03_34 — 3.10.4 指针引用
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:33] 3.10.4 指针引用 ---
|
||||
struct Teacher{
|
||||
int mAge;
|
||||
};
|
||||
//指针间接修改teacher的年龄
|
||||
void AllocateAndInitByPointer(Teacher** teacher){
|
||||
*teacher = (Teacher*)malloc(sizeof(Teacher));
|
||||
(*teacher)->mAge = 200;
|
||||
}
|
||||
//引用修改teacher年龄
|
||||
void AllocateAndInitByReference(Teacher*& teacher){
|
||||
teacher->mAge = 300;
|
||||
}
|
||||
void test(){
|
||||
//创建Teacher
|
||||
Teacher* teacher = NULL;
|
||||
//指针间接赋值
|
||||
AllocateAndInitByPointer(&teacher);
|
||||
cout << "AllocateAndInitByPointer:" << teacher->mAge << endl;
|
||||
//引用赋值,将teacher本身传到ChangeAgeByReference函数中
|
||||
AllocateAndInitByReference(teacher);
|
||||
cout << "AllocateAndInitByReference:" << teacher->mAge << endl;
|
||||
free(teacher);
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,58 @@
|
||||
// ============================================================================
|
||||
// p1c03_29 — 3.10.1 引用基本用法
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:28] 3.10.1 引用基本用法 ---
|
||||
//1. 认识引用
|
||||
void test01(){
|
||||
|
||||
int a = 10;
|
||||
//给变量a取一个别名b
|
||||
int& b = a;
|
||||
cout << "a:" << a << endl;
|
||||
cout << "b:" << b << endl;
|
||||
cout << "------------" << endl;
|
||||
//操作b就相当于操作a本身
|
||||
b = 100;
|
||||
cout << "a:" << a << endl;
|
||||
cout << "b:" << b << endl;
|
||||
cout << "------------" << endl;
|
||||
//一个变量可以有n个别名
|
||||
int& c = a;
|
||||
c = 200;
|
||||
cout << "a:" << a << endl;
|
||||
cout << "b:" << b << endl;
|
||||
cout << "c:" << c << endl;
|
||||
cout << "------------" << endl;
|
||||
//a,b,c的地址都是相同的
|
||||
cout << "a:" << &a << endl;
|
||||
cout << "b:" << &b << endl;
|
||||
cout << "c:" << &c << endl;
|
||||
}
|
||||
//2. 使用引用注意事项
|
||||
void test02(){
|
||||
//1) 引用必须初始化
|
||||
//int& ref; //报错:必须初始化引用
|
||||
//2) 引用一旦初始化，不能改变引用
|
||||
int a = 10;
|
||||
int b = 20;
|
||||
int& ref = a;
|
||||
ref = b; //不能改变引用
|
||||
//3) 不能对数组建立引用
|
||||
int arr[10];
|
||||
//int& ref3[10] = arr;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test01();
|
||||
test02();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,40 @@
|
||||
// ============================================================================
|
||||
// p1c03_30 — 3.10.1 引用基本用法
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:29] 3.10.1 引用基本用法 ---
|
||||
static void block_0() {
|
||||
//1. 建立数组引用方法一
|
||||
typedef int ArrRef[10];
|
||||
int arr[10];
|
||||
ArrRef& aRef = arr;
|
||||
for (int i = 0; i < 10;i ++){
|
||||
aRef[i] = i+1;
|
||||
}
|
||||
for (int i = 0; i < 10;i++){
|
||||
cout << arr[i] << " ";
|
||||
}
|
||||
cout << endl;
|
||||
//2. 建立数组引用方法二
|
||||
int(&f)[10] = arr;
|
||||
for (int i = 0; i < 10; i++){
|
||||
f[i] = i+10;
|
||||
}
|
||||
for (int i = 0; i < 10; i++){
|
||||
cout << arr[i] << " ";
|
||||
}
|
||||
cout << endl;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
block_0();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,27 @@
|
||||
// ============================================================================
|
||||
// p1c03_33 — 3.10.3 引用的本质
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:32] 3.10.3 引用的本质 ---
|
||||
//发现是引用，转换为 int* const ref = &a;
|
||||
void testFunc(int& ref){
|
||||
ref = 100; // ref是引用，转换为*ref = 100
|
||||
}
|
||||
int main(){
|
||||
int a = 10;
|
||||
int& aRef = a; //自动转换为 int* const aRef = &a;这也能说明引用为什么必须初始化
|
||||
aRef = 20; //内部发现aRef是引用，自动帮我们转换为: *aRef = 20;
|
||||
cout << "a:" << a << endl;
|
||||
cout << "aRef:" << aRef << endl;
|
||||
testFunc(a);
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,49 @@
|
||||
// ============================================================================
|
||||
// p1c03_31 — 3.10.2 函数中的引用
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:30] 3.10.2 函数中的引用 ---
|
||||
//值传递
|
||||
void ValueSwap(int m,int n){
|
||||
int temp = m;
|
||||
m = n;
|
||||
n = temp;
|
||||
}
|
||||
//地址传递
|
||||
void PointerSwap(int* m,int* n){
|
||||
int temp = *m;
|
||||
*m = *n;
|
||||
*n = temp;
|
||||
}
|
||||
//引用传递
|
||||
void ReferenceSwap(int& m,int& n){
|
||||
int temp = m;
|
||||
m = n;
|
||||
n = temp;
|
||||
}
|
||||
void test(){
|
||||
int a = 10;
|
||||
int b = 20;
|
||||
//值传递
|
||||
ValueSwap(a, b);
|
||||
cout << "a:" << a << " b:" << b << endl;
|
||||
//地址传递
|
||||
PointerSwap(&a, &b);
|
||||
cout << "a:" << a << " b:" << b << endl;
|
||||
//引用传递
|
||||
ReferenceSwap(a, b);
|
||||
cout << "a:" << a << " b:" << b << endl;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,35 @@
|
||||
// ============================================================================
|
||||
// p1c03_32 — 3.10.2 函数中的引用
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:31] 3.10.2 函数中的引用 ---
|
||||
//返回局部变量引用
|
||||
int& TestFun01(){
|
||||
int a = 10; //局部变量
|
||||
return a;
|
||||
}
|
||||
//返回静态变量引用
|
||||
int& TestFunc02(){
|
||||
static int a = 20;
|
||||
cout << "static int a : " << a << endl;
|
||||
return a;
|
||||
}
|
||||
int main(){
|
||||
//不能返回局部变量的引用
|
||||
int& ret01 = TestFun01();
|
||||
//如果函数做左值，那么必须返回引用
|
||||
TestFunc02();
|
||||
TestFunc02() = 100;
|
||||
TestFunc02();
|
||||
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,26 @@
|
||||
// ============================================================================
|
||||
// p1c03_01 — 3.1 ::作用域运算符
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:0] 3.1 ::作用域运算符 ---
|
||||
//全局变量
|
||||
int a = 10;
|
||||
void test(){
|
||||
//局部变量
|
||||
int a = 20;
|
||||
//全局a被隐藏
|
||||
cout << "a:" << a << endl;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,28 @@
|
||||
// ============================================================================
|
||||
// p1c03_02 — 3.1 ::作用域运算符
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:1] 3.1 ::作用域运算符 ---
|
||||
//全局变量
|
||||
int a = 10;
|
||||
//1. 局部变量和全局变量同名
|
||||
void test(){
|
||||
int a = 20;
|
||||
//打印局部变量a
|
||||
cout << "局部变量a:" << a << endl;
|
||||
//打印全局变量a
|
||||
cout << "全局变量a:" << ::a << endl;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,50 @@
|
||||
// ============================================================================
|
||||
// p1c03_15 — 3.4 C++中所有的变量和函数都必须有类型
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
|
||||
// --- 原文片段 [58954439:14] 3.4 C++中所有的变量和函数都必须有类型 ---
|
||||
//i没有写类型，可以是任意类型
|
||||
int fun1(int i){
|
||||
printf("%d\n", i);
|
||||
return 0;
|
||||
}
|
||||
//i没有写类型，可以是任意类型
|
||||
int fun2(char* i){
|
||||
printf("%s\n", i);
|
||||
return 0;
|
||||
}
|
||||
//没有写参数，代表可以传任何类型的实参
|
||||
int fun3(void){
|
||||
printf("fun33333333333333333\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
//C语言，如果函数没有参数，建议写void，代表没有参数
|
||||
int fun4(void){
|
||||
printf("fun4444444444444\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
int g(void){
|
||||
return 10;
|
||||
}
|
||||
|
||||
int main(){
|
||||
|
||||
fun1(10);
|
||||
fun2("abc");
|
||||
fun3(); // 注意：C89 中 fun3() 可接受任意参数；C17 下 fun3(void) 不接受参数
|
||||
printf("g = %d\n", g());
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,23 @@
|
||||
// ============================================================================
|
||||
// p1c03_16 — 3.5 更严格的类型转换
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
|
||||
// --- 原文片段 [58954439:15] 3.5 更严格的类型转换 ---
|
||||
typedef enum COLOR{ GREEN, RED, YELLOW } color;
|
||||
int main(){
|
||||
color mycolor = GREEN;
|
||||
mycolor = 10;
|
||||
printf("mycolor:%d\n", mycolor);
|
||||
char* p = malloc(10);
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,36 @@
|
||||
// ============================================================================
|
||||
// p1c03_17 — 3.6 struct类型加强
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:16] 3.6 struct类型加强 ---
|
||||
//1. 结构体中即可以定义成员变量，也可以定义成员函数
|
||||
struct Student{
|
||||
string mName;
|
||||
int mAge;
|
||||
void setName(string name){ mName = name; }
|
||||
void setAge(int age){ mAge = age; }
|
||||
void showStudent(){
|
||||
cout << "Name:" << mName << " Age:" << mAge << endl;
|
||||
}
|
||||
};
|
||||
|
||||
//2. c++中定义结构体变量不需要加struct关键字
|
||||
void test01(){
|
||||
Student student;
|
||||
student.setName("John");
|
||||
student.setAge(20);
|
||||
student.showStudent();
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test01();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,28 @@
|
||||
// ============================================================================
|
||||
// p1c03_19 — 3.8 三目运算符功能增强
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
|
||||
// --- 原文片段 [58954439:18] 3.8 三目运算符功能增强 ---
|
||||
static void block_0() {
|
||||
int a = 10;
|
||||
int b = 20;
|
||||
printf("ret:%d\n", a > b ? a : b);
|
||||
//思考一个问题，(a > b ? a : b) 三目运算表达式返回的是什么？
|
||||
|
||||
//(a > b ? a : b) = 100;
|
||||
//返回的是右值
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
block_0();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,29 @@
|
||||
// ============================================================================
|
||||
// p1c03_20 — 3.8 三目运算符功能增强
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:19] 3.8 三目运算符功能增强 ---
|
||||
static void block_0() {
|
||||
int a = 10;
|
||||
int b = 20;
|
||||
printf("ret:%d\n", a > b ? a : b);
|
||||
//思考一个问题，(a > b ? a : b) 三目运算表达式返回的是什么？
|
||||
|
||||
cout << "b:" << b << endl;
|
||||
//返回的是左值，变量的引用
|
||||
(a > b ? a : b) = 100;//返回的是左值，变量的引用
|
||||
cout << "b:" << b << endl;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
block_0();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,38 @@
|
||||
// ============================================================================
|
||||
// p1c03_11 — 3.2.3 using声明
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:10] 3.2.3 using声明 ---
|
||||
namespace A{
|
||||
int paramA = 20;
|
||||
int paramB = 30;
|
||||
void funcA(){ cout << "hello funcA" << endl; }
|
||||
void funcB(){ cout << "hello funcA" << endl; }
|
||||
}
|
||||
|
||||
void test(){
|
||||
//1. 通过命名空间域运算符
|
||||
cout << A::paramA << endl;
|
||||
A::funcA();
|
||||
//2. using声明
|
||||
using A::paramA;
|
||||
using A::funcA;
|
||||
cout << paramA << endl;
|
||||
//cout << paramB << endl; //不可直接访问
|
||||
funcA();
|
||||
//3. 同名冲突
|
||||
//int paramA = 20; //相同作用域注意同名冲突
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,29 @@
|
||||
// ============================================================================
|
||||
// p1c03_12 — 3.2.3 using声明
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:11] 3.2.3 using声明 ---
|
||||
namespace A{
|
||||
void func(){}
|
||||
void func(int x){}
|
||||
int func(int x,int y){}
|
||||
}
|
||||
void test(){
|
||||
using A::func;
|
||||
func();
|
||||
func(10);
|
||||
func(10, 20);
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,51 @@
|
||||
// ============================================================================
|
||||
// p1c03_13 — 3.2.4 using编译指令
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954439:12] 3.2.4 using编译指令 ---
|
||||
namespace A{
|
||||
int paramA = 20;
|
||||
int paramB = 30;
|
||||
void funcA(){ cout << "hello funcA" << endl; }
|
||||
void funcB(){ cout << "hello funcB" << endl; }
|
||||
}
|
||||
|
||||
void test01(){
|
||||
using namespace A;
|
||||
cout << paramA << endl;
|
||||
cout << paramB << endl;
|
||||
funcA();
|
||||
funcB();
|
||||
|
||||
//不会产生二义性
|
||||
int paramA = 30;
|
||||
cout << paramA << endl;
|
||||
}
|
||||
|
||||
namespace B{
|
||||
int paramA = 20;
|
||||
int paramB = 30;
|
||||
void funcA(){ cout << "hello funcA" << endl; }
|
||||
void funcB(){ cout << "hello funcB" << endl; }
|
||||
}
|
||||
|
||||
void test02(){
|
||||
using namespace A;
|
||||
using namespace B;
|
||||
//二义性产生，不知道调用A还是B的paramA
|
||||
//cout << paramA << endl;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test01();
|
||||
test02();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,18 @@
|
||||
# Auto-generated by tools/gen_part1.py — do not edit by hand.
|
||||
# 章节：p01/ch04/s01
|
||||
add_executable(p1c04_01_01 class_encapsulation.c)
|
||||
set_target_properties(p1c04_01_01 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_01_01 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_01_02 class_encapsulation.cpp)
|
||||
set_target_properties(p1c04_01_02 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_01_02 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_01_02 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_01_03 class_encapsulation_2.cpp)
|
||||
set_target_properties(p1c04_01_03 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_01_03 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_01_03 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_01_04 private_members.cpp)
|
||||
set_target_properties(p1c04_01_04 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_01_04 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_01_04 PRIVATE -Wall -Wextra)
|
||||
add_custom_target(all_p01_ch04_s01 DEPENDS p1c04_01_01 p1c04_01_02 p1c04_01_03 p1c04_01_04)
|
||||
@@ -0,0 +1,41 @@
|
||||
// ============================================================================
|
||||
// p1c04_01_01 — 4.1.2 类的封装
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
|
||||
// --- 原文片段 [58954448:0] 4.1.2 类的封装 ---
|
||||
typedef struct _Person{
|
||||
char name[64];
|
||||
int age;
|
||||
}Person;
|
||||
typedef struct _Aninal{
|
||||
char name[64];
|
||||
int age;
|
||||
int type; //动物种类
|
||||
}Ainmal;
|
||||
|
||||
void PersonEat(Person* person){
|
||||
printf("%s在吃人吃的饭!\n",person->name);
|
||||
}
|
||||
void AnimalEat(Ainmal* animal){
|
||||
printf("%s在吃动物吃的饭!\n", animal->name);
|
||||
}
|
||||
|
||||
int main(){
|
||||
|
||||
Person person;
|
||||
strcpy(person.name, "小明");
|
||||
person.age = 30;
|
||||
AnimalEat(&person);
|
||||
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,40 @@
|
||||
// ============================================================================
|
||||
// p1c04_01_02 — 4.1.2 类的封装
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954448:1] 4.1.2 类的封装 ---
|
||||
//封装两层含义
|
||||
//1. 属性和行为合成一个整体
|
||||
//2. 访问控制，现实事物本身有些属性和行为是不对外开放
|
||||
class Person{
|
||||
//人具有的行为(函数)
|
||||
public:
|
||||
void Dese(){ cout << "我有钱，年轻，个子又高，就爱嘚瑟!" << endl;}
|
||||
//人的属性(变量)
|
||||
public:
|
||||
int mTall; //多高，可以让外人知道
|
||||
protected:
|
||||
int mMoney; // 有多少钱,只能儿子孙子知道
|
||||
private:
|
||||
int mAge; //年龄，不想让外人知道
|
||||
};
|
||||
|
||||
int main(){
|
||||
|
||||
Person p;
|
||||
p.mTall = 220;
|
||||
//p.mMoney 保护成员外部无法访问
|
||||
//p.mAge 私有成员外部无法访问
|
||||
p.Dese();
|
||||
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,31 @@
|
||||
// ============================================================================
|
||||
// p1c04_01_03 — 4.1.2 类的封装
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954448:2] 4.1.2 类的封装 ---
|
||||
class A{
|
||||
int mAge;
|
||||
};
|
||||
struct B{
|
||||
int mAge;
|
||||
};
|
||||
|
||||
void test(){
|
||||
A a;
|
||||
B b;
|
||||
//a.mAge; //无法访问私有成员
|
||||
b.mAge; //可正常外部访问
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,35 @@
|
||||
// ============================================================================
|
||||
// p1c04_01_04 — 4.1.3 将成员变量设置为private
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954448:3] 4.1.3 将成员变量设置为private ---
|
||||
static void block_0() {
|
||||
class AccessLevels{
|
||||
public:
|
||||
//对只读属性进行只读访问
|
||||
int getReadOnly(){ return readOnly; }
|
||||
//对读写属性进行读写访问
|
||||
void setReadWrite(int val){ readWrite = val; }
|
||||
int getReadWrite(){ return readWrite; }
|
||||
//对只写属性进行只写访问
|
||||
void setWriteOnly(int val){ writeOnly = val; }
|
||||
private:
|
||||
int readOnly; //对外只读访问
|
||||
int noAccess; //外部不可访问
|
||||
int readWrite; //读写访问
|
||||
int writeOnly; //只写访问
|
||||
};
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
block_0();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,11 @@
|
||||
# Auto-generated by tools/gen_part1.py — do not edit by hand.
|
||||
# 章节：p01/ch04/s02
|
||||
add_executable(p1c04_02_01 cube_class_design.cpp)
|
||||
set_target_properties(p1c04_02_01 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_02_01 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_02_01 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_02_02 point_and_circle.cpp)
|
||||
set_target_properties(p1c04_02_02 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_02_02 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_02_02 PRIVATE -Wall -Wextra)
|
||||
add_custom_target(all_p01_ch04_s02 DEPENDS p1c04_02_01 p1c04_02_02)
|
||||
@@ -0,0 +1,80 @@
|
||||
// ============================================================================
|
||||
// p1c04_02_01 — 4.2.1 设计立方体类
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954449:0] 4.2.1 设计立方体类 ---
|
||||
//立方体类
|
||||
class Cub{
|
||||
public:
|
||||
void setL(int l){ mL = l; }
|
||||
void setW(int w){ mW = w; }
|
||||
void setH(int h){ mH = h; }
|
||||
int getL(){ return mL; }
|
||||
int getW(){ return mW; }
|
||||
int getH(){ return mH; }
|
||||
//立方体面积
|
||||
int caculateS(){ return (mL*mW + mL*mH + mW*mH) * 2; }
|
||||
//立方体体积
|
||||
int caculateV(){ return mL * mW * mH; }
|
||||
//成员方法
|
||||
bool CubCompare(Cub& c){
|
||||
if (getL() == c.getL() && getW() == c.getW() && getH() == c.getH()){
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
private:
|
||||
int mL; //长
|
||||
int mW; //宽
|
||||
int mH; //高
|
||||
};
|
||||
|
||||
//比较两个立方体是否相等
|
||||
bool CubCompare(Cub& c1, Cub& c2){
|
||||
if (c1.getL() == c2.getL() && c1.getW() == c2.getW() && c1.getH() == c2.getH()){
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
void test(){
|
||||
Cub c1, c2;
|
||||
c1.setL(10);
|
||||
c1.setW(20);
|
||||
c1.setH(30);
|
||||
|
||||
c2.setL(20);
|
||||
c2.setW(20);
|
||||
c2.setH(30);
|
||||
|
||||
cout << "c1面积:" << c1.caculateS() << " 体积:" << c1.caculateV() << endl;
|
||||
cout << "c2面积:" << c2.caculateS() << " 体积:" << c2.caculateV() << endl;
|
||||
|
||||
//比较两个立方体是否相等
|
||||
if (CubCompare(c1, c2)){
|
||||
cout << "c1和c2相等!" << endl;
|
||||
}
|
||||
else{
|
||||
cout << "c1和c2不相等!" << endl;
|
||||
}
|
||||
|
||||
if (c1.CubCompare(c2)){
|
||||
cout << "c1和c2相等!" << endl;
|
||||
}
|
||||
else{
|
||||
cout << "c1和c2不相等!" << endl;
|
||||
}
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,71 @@
|
||||
// ============================================================================
|
||||
// p1c04_02_02 — 4.2.2 点和圆的关系
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954449:1] 4.2.2 点和圆的关系 ---
|
||||
//点类
|
||||
class Point{
|
||||
public:
|
||||
void setX(int x){ mX = x; }
|
||||
void setY(int y){ mY = y; }
|
||||
int getX(){ return mX; }
|
||||
int getY(){ return mY; }
|
||||
private:
|
||||
int mX;
|
||||
int mY;
|
||||
};
|
||||
|
||||
//圆类
|
||||
class Circle{
|
||||
public:
|
||||
void setP(int x,int y){
|
||||
mP.setX(x);
|
||||
mP.setY(y);
|
||||
}
|
||||
void setR(int r){ mR = r; }
|
||||
Point& getP(){ return mP; }
|
||||
int getR(){ return mR; }
|
||||
//判断点和圆的关系
|
||||
void IsPointInCircle(Point& point){
|
||||
int distance = (point.getX() - mP.getX()) * (point.getX() - mP.getX()) + (point.getY() - mP.getY()) * (point.getY() - mP.getY());
|
||||
int radius = mR * mR;
|
||||
if (distance < radius){
|
||||
cout << "Point(" << point.getX() << "," << point.getY() << ")在圆内!" << endl;
|
||||
}
|
||||
else if (distance > radius){
|
||||
cout << "Point(" << point.getX() << "," << point.getY() << ")在圆外!" << endl;
|
||||
}
|
||||
else{
|
||||
cout << "Point(" << point.getX() << "," << point.getY() << ")在圆上!" << endl;
|
||||
}
|
||||
}
|
||||
private:
|
||||
Point mP; //圆心
|
||||
int mR; //半径
|
||||
};
|
||||
|
||||
void test(){
|
||||
//实例化圆对象
|
||||
Circle circle;
|
||||
circle.setP(20, 20);
|
||||
circle.setR(5);
|
||||
//实例化点对象
|
||||
Point point;
|
||||
point.setX(25);
|
||||
point.setY(20);
|
||||
|
||||
circle.IsPointInCircle(point);
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,71 @@
|
||||
# Auto-generated by tools/gen_part1.py — do not edit by hand.
|
||||
# 章节：p01/ch04/s03
|
||||
add_executable(p1c04_03_01 ctor_and_dtor.cpp)
|
||||
set_target_properties(p1c04_03_01 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_03_01 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_03_01 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_03_02 ctor_classification.cpp)
|
||||
set_target_properties(p1c04_03_02 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_03_02 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_03_02 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_03_03 copy_ctor_timing.cpp)
|
||||
set_target_properties(p1c04_03_03 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_03_03 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_03_03 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_03_04 deep_vs_shallow_copy.cpp)
|
||||
set_target_properties(p1c04_03_04 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_03_04 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_03_04 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_03_05 initializer_list.cpp)
|
||||
set_target_properties(p1c04_03_05 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_03_05 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_03_05 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_03_06 class_object_member.cpp)
|
||||
set_target_properties(p1c04_03_06 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_03_06 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_03_06 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_03_07 explicit_keyword.cpp)
|
||||
set_target_properties(p1c04_03_07 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_03_07 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_03_07 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_03_08 c_dynamic_alloc.cpp)
|
||||
set_target_properties(p1c04_03_08 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_03_08 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_03_08 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_03_09 new_operator.cpp)
|
||||
set_target_properties(p1c04_03_09 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_03_09 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_03_09 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_03_10 delete_operator.cpp)
|
||||
set_target_properties(p1c04_03_10 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_03_10 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_03_10 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_03_11 new_delete_array.cpp)
|
||||
set_target_properties(p1c04_03_11 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_03_11 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_03_11 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_03_12 new_delete_array_2.cpp)
|
||||
set_target_properties(p1c04_03_12 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_03_12 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_03_12 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_03_13 delete_void_ptr.cpp)
|
||||
set_target_properties(p1c04_03_13 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_03_13 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_03_13 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_03_14 static_member_variable.cpp)
|
||||
set_target_properties(p1c04_03_14 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_03_14 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_03_14 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_03_15 static_member_function.cpp)
|
||||
set_target_properties(p1c04_03_15 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_03_15 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_03_15 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_03_16 const_static_member.cpp)
|
||||
set_target_properties(p1c04_03_16 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_03_16 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_03_16 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_03_17 static_singleton.cpp)
|
||||
set_target_properties(p1c04_03_17 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_03_17 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_03_17 PRIVATE -Wall -Wextra)
|
||||
add_custom_target(all_p01_ch04_s03 DEPENDS p1c04_03_01 p1c04_03_02 p1c04_03_03 p1c04_03_04 p1c04_03_05 p1c04_03_06 p1c04_03_07 p1c04_03_08 p1c04_03_09 p1c04_03_10 p1c04_03_11 p1c04_03_12 p1c04_03_13 p1c04_03_14 p1c04_03_15 p1c04_03_16 p1c04_03_17)
|
||||
@@ -0,0 +1,52 @@
|
||||
// ============================================================================
|
||||
// p1c04_03_08 — 4.3.9.2 C动态分配内存方法
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
#include <cstring>
|
||||
|
||||
// --- 原文片段 [58954451:7] 4.3.9.2 C动态分配内存方法 ---
|
||||
class Person{
|
||||
public:
|
||||
Person(){
|
||||
mAge = 20;
|
||||
pName = (char*)malloc(strlen("john")+1);
|
||||
strcpy(pName, "john");
|
||||
}
|
||||
void Init(){
|
||||
mAge = 20;
|
||||
pName = (char*)malloc(strlen("john")+1);
|
||||
strcpy(pName, "john");
|
||||
}
|
||||
void Clean(){
|
||||
if (pName != NULL){
|
||||
free(pName);
|
||||
}
|
||||
}
|
||||
public:
|
||||
int mAge;
|
||||
char* pName;
|
||||
};
|
||||
int main(){
|
||||
|
||||
//分配内存
|
||||
Person* person = (Person*)malloc(sizeof(Person));
|
||||
if(person == NULL){
|
||||
return 0;
|
||||
}
|
||||
//调用初始化函数
|
||||
person->Init();
|
||||
//清理对象
|
||||
person->Clean();
|
||||
//释放person对象
|
||||
free(person);
|
||||
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,90 @@
|
||||
// ============================================================================
|
||||
// p1c04_03_06 — 4.3.7.2 类对象作为成员
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954451:5] 4.3.7.2 类对象作为成员 ---
|
||||
//汽车类
|
||||
class Car{
|
||||
public:
|
||||
Car(){
|
||||
cout << "Car 默认构造函数!" << endl;
|
||||
mName = "大众汽车";
|
||||
}
|
||||
Car(string name){
|
||||
cout << "Car 带参数构造函数!" << endl;
|
||||
mName = name;
|
||||
}
|
||||
~Car(){
|
||||
cout << "Car 析构函数!" << endl;
|
||||
}
|
||||
public:
|
||||
string mName;
|
||||
};
|
||||
|
||||
//拖拉机
|
||||
class Tractor{
|
||||
public:
|
||||
Tractor(){
|
||||
cout << "Tractor 默认构造函数!" << endl;
|
||||
mName = "爬土坡专用拖拉机";
|
||||
}
|
||||
Tractor(string name){
|
||||
cout << "Tractor 带参数构造函数!" << endl;
|
||||
mName = name;
|
||||
}
|
||||
~Tractor(){
|
||||
cout << "Tractor 析构函数!" << endl;
|
||||
}
|
||||
public:
|
||||
string mName;
|
||||
};
|
||||
|
||||
//人类
|
||||
class Person{
|
||||
public:
|
||||
#if 1
|
||||
//类mCar不存在合适的构造函数
|
||||
Person(string name){
|
||||
mName = name;
|
||||
}
|
||||
#else
|
||||
//初始化列表可以指定调用构造函数
|
||||
Person(string carName, string tracName, string name) : mTractor(tracName), mCar(carName), mName(name){
|
||||
cout << "Person 构造函数!" << endl;
|
||||
}
|
||||
#endif
|
||||
|
||||
void GoWorkByCar(){
|
||||
cout << mName << "开着" << mCar.mName << "去上班!" << endl;
|
||||
}
|
||||
void GoWorkByTractor(){
|
||||
cout << mName << "开着" << mTractor.mName << "去上班!" << endl;
|
||||
}
|
||||
~Person(){
|
||||
cout << "Person 析构函数!" << endl;
|
||||
}
|
||||
private:
|
||||
string mName;
|
||||
Car mCar;
|
||||
Tractor mTractor;
|
||||
};
|
||||
|
||||
void test(){
|
||||
//Person person("宝马", "东风拖拉机", "赵四");
|
||||
Person person("刘能");
|
||||
person.GoWorkByCar();
|
||||
person.GoWorkByTractor();
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,26 @@
|
||||
// ============================================================================
|
||||
// p1c04_03_16 — 4.3.10.3 const静态成员属性
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954451:15] 4.3.10.3 const静态成员属性 ---
|
||||
class Person{
|
||||
public:
|
||||
//static const int mShare = 10;
|
||||
const static int mShare = 10; //只读区，不可修改
|
||||
};
|
||||
int main(){
|
||||
|
||||
cout << Person::mShare << endl;
|
||||
//Person::mShare = 20;
|
||||
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,69 @@
|
||||
// ============================================================================
|
||||
// p1c04_03_03 — 4.3.4 拷贝构造函数的调用时机
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
#include <algorithm>
|
||||
|
||||
// --- 原文片段 [58954451:2] 4.3.4 拷贝构造函数的调用时机 ---
|
||||
class Person{
|
||||
public:
|
||||
Person(){
|
||||
cout << "no param contructor!" << endl;
|
||||
mAge = 10;
|
||||
}
|
||||
Person(int age){
|
||||
cout << "param constructor!" << endl;
|
||||
mAge = age;
|
||||
}
|
||||
Person(const Person& person){
|
||||
cout << "copy constructor!" << endl;
|
||||
mAge = person.mAge;
|
||||
}
|
||||
~Person(){
|
||||
cout << "destructor!" << endl;
|
||||
}
|
||||
public:
|
||||
int mAge;
|
||||
};
|
||||
//1. 旧对象初始化新对象
|
||||
void test01(){
|
||||
|
||||
Person p(10);
|
||||
Person p1(p);
|
||||
Person p2 = Person(p);
|
||||
Person p3 = p; // 相当于Person p2 = Person(p);
|
||||
}
|
||||
|
||||
//2. 传递的参数是普通对象，函数参数也是普通对象，传递将会调用拷贝构造
|
||||
void doBussiness(Person p){}
|
||||
|
||||
void test02(){
|
||||
Person p(10);
|
||||
doBussiness(p);
|
||||
}
|
||||
|
||||
//3. 函数返回局部对象
|
||||
Person MyBusiness(){
|
||||
Person p(10);
|
||||
cout << "局部p:" << (int*)&p << endl;
|
||||
return p;
|
||||
}
|
||||
void test03(){
|
||||
//vs release、qt下没有调用拷贝构造函数
|
||||
//vs debug下调用一次拷贝构造函数
|
||||
Person p = MyBusiness();
|
||||
cout << "局部p:" << (int*)&p << endl;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test01();
|
||||
test03();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,45 @@
|
||||
// ============================================================================
|
||||
// p1c04_03_01 — 4.3.2 构造函数和析构函数
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
#include <cstring>
|
||||
|
||||
// --- 原文片段 [58954451:0] 4.3.2 构造函数和析构函数 ---
|
||||
class Person{
|
||||
public:
|
||||
Person(){
|
||||
cout << "构造函数调用!" << endl;
|
||||
pName = (char*)malloc(sizeof("John"));
|
||||
strcpy(pName, "John");
|
||||
mTall = 150;
|
||||
mMoney = 100;
|
||||
}
|
||||
~Person(){
|
||||
cout << "析构函数调用!" << endl;
|
||||
if (pName != NULL){
|
||||
free(pName);
|
||||
pName = NULL;
|
||||
}
|
||||
}
|
||||
public:
|
||||
char* pName;
|
||||
int mTall;
|
||||
int mMoney;
|
||||
};
|
||||
|
||||
void test(){
|
||||
Person person;
|
||||
cout << person.pName << person.mTall << person.mMoney << endl;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,83 @@
|
||||
// ============================================================================
|
||||
// p1c04_03_02 — 4.3.3 构造函数的分类及调用
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
#include <algorithm>
|
||||
|
||||
// --- 原文片段 [58954451:1] 4.3.3 构造函数的分类及调用 ---
|
||||
class Person{
|
||||
public:
|
||||
Person(){
|
||||
cout << "no param constructor!" << endl;
|
||||
mAge = 0;
|
||||
}
|
||||
//有参构造函数
|
||||
Person(int age){
|
||||
cout << "1 param constructor!" << endl;
|
||||
mAge = age;
|
||||
}
|
||||
//拷贝构造函数(复制构造函数) 使用另一个对象初始化本对象
|
||||
Person(const Person& person){
|
||||
cout << "copy constructor!" << endl;
|
||||
mAge = person.mAge;
|
||||
}
|
||||
//打印年龄
|
||||
void PrintPerson(){
|
||||
cout << "Age:" << mAge << endl;
|
||||
}
|
||||
private:
|
||||
int mAge;
|
||||
};
|
||||
//1. 无参构造调用方式
|
||||
void test01(){
|
||||
|
||||
//调用无参构造函数
|
||||
Person person1;
|
||||
person1.PrintPerson();
|
||||
|
||||
//无参构造函数错误调用方式
|
||||
//Person person2();
|
||||
//person2.PrintPerson();
|
||||
}
|
||||
//2. 调用有参构造函数
|
||||
void test02(){
|
||||
|
||||
//第一种 括号法，最常用
|
||||
Person person01(100);
|
||||
person01.PrintPerson();
|
||||
|
||||
//调用拷贝构造函数
|
||||
Person person02(person01);
|
||||
person02.PrintPerson();
|
||||
|
||||
//第二种 匿名对象(显示调用构造函数)
|
||||
Person(200); //匿名对象，没有名字的对象
|
||||
|
||||
Person person03 = Person(300);
|
||||
person03.PrintPerson();
|
||||
|
||||
//注意: 使用匿名对象初始化判断调用哪一个构造函数，要看匿名对象的参数类型
|
||||
Person person06(Person(400)); //等价于 Person person06 = Person(400);
|
||||
person06.PrintPerson();
|
||||
|
||||
//第三种 =号法 隐式转换
|
||||
Person person04 = 100; //Person person04 = Person(100)
|
||||
person04.PrintPerson();
|
||||
|
||||
//调用拷贝构造
|
||||
Person person05 = person04; //Person person05 = Person(person04)
|
||||
person05.PrintPerson();
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test01();
|
||||
test02();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,47 @@
|
||||
// ============================================================================
|
||||
// p1c04_03_04 — 4.3.6 深拷贝和浅拷贝
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
#include <cstring>
|
||||
|
||||
// --- 原文片段 [58954451:3] 4.3.6 深拷贝和浅拷贝 ---
|
||||
class Person{
|
||||
public:
|
||||
Person(char* name,int age){
|
||||
pName = (char*)malloc(strlen(name) + 1);
|
||||
strcpy(pName,name);
|
||||
mAge = age;
|
||||
}
|
||||
//增加拷贝构造函数
|
||||
Person(const Person& person){
|
||||
pName = (char*)malloc(strlen(person.pName) + 1);
|
||||
strcpy(pName, person.pName);
|
||||
mAge = person.mAge;
|
||||
}
|
||||
~Person(){
|
||||
if (pName != NULL){
|
||||
free(pName);
|
||||
}
|
||||
}
|
||||
private:
|
||||
char* pName;
|
||||
int mAge;
|
||||
};
|
||||
|
||||
void test(){
|
||||
Person p1("Edward",30);
|
||||
//用对象p1初始化对象p2,调用c++提供的默认拷贝构造函数
|
||||
Person p2 = p1;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,58 @@
|
||||
// ============================================================================
|
||||
// p1c04_03_10 — 4.3.9.4 delete operator
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
#include <cstring>
|
||||
|
||||
// --- 原文片段 [58954451:9] 4.3.9.4 delete operator ---
|
||||
class Person{
|
||||
public:
|
||||
Person(){
|
||||
cout << "无参构造函数!" << endl;
|
||||
pName = (char*)malloc(strlen("undefined") + 1);
|
||||
strcpy(pName, "undefined");
|
||||
mAge = 0;
|
||||
}
|
||||
Person(char* name, int age){
|
||||
cout << "有参构造函数!" << endl;
|
||||
pName = (char*)malloc(strlen(name) + 1);
|
||||
strcpy(pName, name);
|
||||
mAge = age;
|
||||
}
|
||||
void ShowPerson(){
|
||||
cout << "Name:" << pName << " Age:" << mAge << endl;
|
||||
}
|
||||
~Person(){
|
||||
cout << "析构函数!" << endl;
|
||||
if (pName != NULL){
|
||||
delete pName;
|
||||
pName = NULL;
|
||||
}
|
||||
}
|
||||
public:
|
||||
char* pName;
|
||||
int mAge;
|
||||
};
|
||||
|
||||
void test(){
|
||||
Person* person1 = new Person;
|
||||
Person* person2 = new Person("John",33);
|
||||
|
||||
person1->ShowPerson();
|
||||
person2->ShowPerson();
|
||||
|
||||
delete person1;
|
||||
delete person2;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,40 @@
|
||||
// ============================================================================
|
||||
// p1c04_03_13 — 4.3.9.6 delete void*可能会出错
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
#include <cstring>
|
||||
|
||||
// --- 原文片段 [58954451:12] 4.3.9.6 delete void*可能会出错 ---
|
||||
class Person{
|
||||
public:
|
||||
Person(char* name, int age){
|
||||
pName = (char*)malloc(sizeof(name));
|
||||
strcpy(pName,name);
|
||||
mAge = age;
|
||||
}
|
||||
~Person(){
|
||||
if (pName != NULL){
|
||||
delete pName;
|
||||
}
|
||||
}
|
||||
public:
|
||||
char* pName;
|
||||
int mAge;
|
||||
};
|
||||
|
||||
void test(){
|
||||
void* person = new Person("john",20);
|
||||
delete person;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,36 @@
|
||||
// ============================================================================
|
||||
// p1c04_03_07 — 4.3.8 explicit关键字
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954451:6] 4.3.8 explicit关键字 ---
|
||||
class MyString{
|
||||
public:
|
||||
explicit MyString(int n){
|
||||
cout << "MyString(int n)!" << endl;
|
||||
}
|
||||
MyString(const char* str){
|
||||
cout << "MyString(const char* str)" << endl;
|
||||
}
|
||||
};
|
||||
|
||||
int main(){
|
||||
|
||||
//给字符串赋值？还是初始化？
|
||||
//MyString str1 = 1;
|
||||
MyString str2(10);
|
||||
|
||||
//寓意非常明确，给字符串赋值
|
||||
MyString str3 = "abcd";
|
||||
MyString str4("abcd");
|
||||
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,42 @@
|
||||
// ============================================================================
|
||||
// p1c04_03_05 — 4.3.7.1 初始化列表
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954451:4] 4.3.7.1 初始化列表 ---
|
||||
static void block_0() {
|
||||
class Person{
|
||||
public:
|
||||
#if 0
|
||||
//传统方式初始化
|
||||
Person(int a,int b,int c){
|
||||
mA = a;
|
||||
mB = b;
|
||||
mC = c;
|
||||
}
|
||||
#endif
|
||||
//初始化列表方式初始化
|
||||
Person(int a, int b, int c):mA(a),mB(b),mC(c){}
|
||||
void PrintPerson(){
|
||||
cout << "mA:" << mA << endl;
|
||||
cout << "mB:" << mB << endl;
|
||||
cout << "mC:" << mC << endl;
|
||||
}
|
||||
private:
|
||||
int mA;
|
||||
int mB;
|
||||
int mC;
|
||||
};
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
block_0();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,31 @@
|
||||
// ============================================================================
|
||||
// p1c04_03_11 — 4.3.9.5 用于数组的new和delete
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954451:10] 4.3.9.5 用于数组的new和delete ---
|
||||
static void block_0() {
|
||||
//创建字符数组
|
||||
char* pStr = new char[100];
|
||||
//创建整型数组
|
||||
int* pArr1 = new int[100];
|
||||
//创建整型数组并初始化
|
||||
int* pArr2 = new int[10]{ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
|
||||
|
||||
//释放数组内存
|
||||
delete[] pStr;
|
||||
delete[] pArr1;
|
||||
delete[] pArr2;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
block_0();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,48 @@
|
||||
// ============================================================================
|
||||
// p1c04_03_12 — 4.3.9.5 用于数组的new和delete
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
#include <cstring>
|
||||
|
||||
// --- 原文片段 [58954451:11] 4.3.9.5 用于数组的new和delete ---
|
||||
class Person{
|
||||
public:
|
||||
Person(){
|
||||
pName = (char*)malloc(strlen("undefined") + 1);
|
||||
strcpy(pName, "undefined");
|
||||
mAge = 0;
|
||||
}
|
||||
Person(char* name, int age){
|
||||
pName = (char*)malloc(sizeof(name));
|
||||
strcpy(pName, name);
|
||||
mAge = age;
|
||||
}
|
||||
~Person(){
|
||||
if (pName != NULL){
|
||||
delete pName;
|
||||
}
|
||||
}
|
||||
public:
|
||||
char* pName;
|
||||
int mAge;
|
||||
};
|
||||
|
||||
void test(){
|
||||
//栈聚合初始化
|
||||
Person person[] = { Person("john", 20), Person("Smith", 22) };
|
||||
cout << person[1].pName << endl;
|
||||
//创建堆上对象数组必须提供构造函数
|
||||
Person* workers = new Person[20];
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,37 @@
|
||||
// ============================================================================
|
||||
// p1c04_03_09 — 4.3.9.3 new operator
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954451:8] 4.3.9.3 new operator ---
|
||||
// 原文为伪代码对照，演示 new 与 malloc 的等价关系：
|
||||
// Person* person = new Person;
|
||||
// 相当于:
|
||||
// Person* person = (Person*)malloc(sizeof(Person));
|
||||
// if(person == NULL){ return 0; }
|
||||
// person->Init(); // 构造函数
|
||||
// 下面给出可编译的对照程序：
|
||||
#include <iostream>
|
||||
#include <cstdlib>
|
||||
#include <cstring>
|
||||
class Person {
|
||||
public:
|
||||
Person() { std::cout << "构造函数!" << std::endl; }
|
||||
void Init() { std::cout << "Init" << std::endl; }
|
||||
};
|
||||
int main() {
|
||||
Person* person = new Person; // C++: new 自动调用构造函数
|
||||
Person* p2 = (Person*)malloc(sizeof(Person));
|
||||
if (p2) { new (p2) Person(); } // 对齐 new 的行为（placement new）
|
||||
delete person;
|
||||
if (p2) { p2->~Person(); free(p2); }
|
||||
return 0;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,54 @@
|
||||
// ============================================================================
|
||||
// p1c04_03_15 — 4.3.10.2 静态成员函数
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954451:14] 4.3.10.2 静态成员函数 ---
|
||||
class Person{
|
||||
public:
|
||||
//普通成员函数可以访问static和non-static成员属性
|
||||
void changeParam1(int param){
|
||||
mParam = param;
|
||||
sNum = param;
|
||||
}
|
||||
//静态成员函数只能访问static成员属性
|
||||
static void changeParam2(int param){
|
||||
//mParam = param; //无法访问
|
||||
sNum = param;
|
||||
}
|
||||
private:
|
||||
static void changeParam3(int param){
|
||||
//mParam = param; //无法访问
|
||||
sNum = param;
|
||||
}
|
||||
public:
|
||||
int mParam;
|
||||
static int sNum;
|
||||
};
|
||||
|
||||
//静态成员属性类外初始化
|
||||
int Person::sNum = 0;
|
||||
|
||||
int main(){
|
||||
|
||||
//1. 类名直接调用
|
||||
Person::changeParam2(100);
|
||||
|
||||
//2. 通过对象调用
|
||||
Person p;
|
||||
p.changeParam2(200);
|
||||
|
||||
//3. 静态成员函数也有访问权限
|
||||
//Person::changeParam3(100); //类外无法访问私有静态成员函数
|
||||
//Person p1;
|
||||
//p1.changeParam3(200);
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,50 @@
|
||||
// ============================================================================
|
||||
// p1c04_03_14 — 4.3.10.1 静态成员变量
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
#include <cstdio>
|
||||
static inline void pause() { printf("按回车键继续..."); (void)getchar(); }
|
||||
|
||||
// --- 原文片段 [58954451:13] 4.3.10.1 静态成员变量 ---
|
||||
class Person{
|
||||
public:
|
||||
//类的静态成员属性
|
||||
static int sNum;
|
||||
private:
|
||||
static int sOther;
|
||||
};
|
||||
|
||||
//类外初始化，初始化时不加static
|
||||
int Person::sNum = 0;
|
||||
int Person::sOther = 0;
|
||||
int main(){
|
||||
|
||||
|
||||
//1. 通过类名直接访问
|
||||
Person::sNum = 100;
|
||||
cout << "Person::sNum:" << Person::sNum << endl;
|
||||
|
||||
//2. 通过对象访问
|
||||
Person p1, p2;
|
||||
p1.sNum = 200;
|
||||
|
||||
cout << "p1.sNum:" << p1.sNum << endl;
|
||||
cout << "p2.sNum:" << p2.sNum << endl;
|
||||
|
||||
//3. 静态成员也有访问权限，类外不能访问私有成员
|
||||
//cout << "Person::sOther:" << Person::sOther << endl;
|
||||
Person p3;
|
||||
//cout << "p3.sOther:" << p3.sOther << endl;
|
||||
|
||||
pause();
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,43 @@
|
||||
// ============================================================================
|
||||
// p1c04_03_17 — 4.3.10.4 静态成员实现单例模式
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954451:16] 4.3.10.4 静态成员实现单例模式 ---
|
||||
class Printer{
|
||||
public:
|
||||
static Printer* getInstance(){ return pPrinter;}
|
||||
void PrintText(string text){
|
||||
cout << "打印内容:" << text << endl;
|
||||
cout << "已打印次数:" << mTimes << endl;
|
||||
cout << "--------------" << endl;
|
||||
mTimes++;
|
||||
}
|
||||
private:
|
||||
Printer(){ mTimes = 0; }
|
||||
Printer(const Printer&){}
|
||||
private:
|
||||
static Printer* pPrinter;
|
||||
int mTimes;
|
||||
};
|
||||
|
||||
Printer* Printer::pPrinter = new Printer;
|
||||
|
||||
void test(){
|
||||
Printer* printer = Printer::getInstance();
|
||||
printer->PrintText("离职报告!");
|
||||
printer->PrintText("入职合同!");
|
||||
printer->PrintText("提交代码!");
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,19 @@
|
||||
# Auto-generated by tools/gen_part1.py — do not edit by hand.
|
||||
# 章节：p01/ch04/s04
|
||||
add_executable(p1c04_04_01 member_storage.cpp)
|
||||
set_target_properties(p1c04_04_01 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_04_01 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_04_01 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_04_02 this_pointer.cpp)
|
||||
set_target_properties(p1c04_04_02 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_04_02 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_04_02 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_04_03 const_member_function.cpp)
|
||||
set_target_properties(p1c04_04_03 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_04_03 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_04_03 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_04_04 const_object.cpp)
|
||||
set_target_properties(p1c04_04_04 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_04_04 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_04_04 PRIVATE -Wall -Wextra)
|
||||
add_custom_target(all_p01_ch04_s04 DEPENDS p1c04_04_01 p1c04_04_02 p1c04_04_03 p1c04_04_04)
|
||||
@@ -0,0 +1,46 @@
|
||||
// ============================================================================
|
||||
// p1c04_04_03 — 4.4.2.3 const修饰成员函数
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
#include <cstdio>
|
||||
static inline void pause() { printf("按回车键继续..."); (void)getchar(); }
|
||||
|
||||
// --- 原文片段 [58954456:2] 4.4.2.3 const修饰成员函数 ---
|
||||
//const修饰成员函数
|
||||
class Person{
|
||||
public:
|
||||
Person(){
|
||||
this->mAge = 0;
|
||||
this->mID = 0;
|
||||
}
|
||||
//在函数括号后面加上const,修饰成员变量不可修改,除了mutable变量
|
||||
void sonmeOperate() const{
|
||||
//this->mAge = 200; //mAge不可修改
|
||||
this->mID = 10;
|
||||
}
|
||||
void ShowPerson(){
|
||||
cout << "ID:" << mID << " mAge:" << mAge << endl;
|
||||
}
|
||||
private:
|
||||
int mAge;
|
||||
mutable int mID;
|
||||
};
|
||||
|
||||
int main(){
|
||||
|
||||
Person person;
|
||||
person.sonmeOperate();
|
||||
person.ShowPerson();
|
||||
|
||||
pause();
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,48 @@
|
||||
// ============================================================================
|
||||
// p1c04_04_04 — 4.4.2.4 const修饰对象(常对象)
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954456:3] 4.4.2.4 const修饰对象(常对象) ---
|
||||
class Person{
|
||||
public:
|
||||
Person(){
|
||||
this->mAge = 0;
|
||||
this->mID = 0;
|
||||
}
|
||||
void ChangePerson() const{
|
||||
//mAge = 100; // 非法：const 成员函数内不能修改非 mutable 成员
|
||||
mID = 100; // 合法：mID 被 mutable 修饰，const 函数内可改
|
||||
}
|
||||
void ShowPerson(){
|
||||
this->mAge = 1000;
|
||||
cout << "ID:" << this->mID << " Age:" << this->mAge << endl;
|
||||
}
|
||||
|
||||
public:
|
||||
int mAge;
|
||||
mutable int mID;
|
||||
};
|
||||
|
||||
void test(){
|
||||
const Person person;
|
||||
//1. 可访问数据成员
|
||||
cout << "Age:" << person.mAge << endl;
|
||||
//person.mAge = 300; //不可修改
|
||||
person.mID = 1001; //但是可以修改mutable修饰的成员变量
|
||||
//2. 只能访问const修饰的函数
|
||||
//person.ShowPerson();
|
||||
person.ChangePerson();
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,65 @@
|
||||
// ============================================================================
|
||||
// p1c04_04_01 — 4.4.1 成员变量和函数的存储
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954456:0] 4.4.1 成员变量和函数的存储 ---
|
||||
class MyClass01{
|
||||
public:
|
||||
int mA;
|
||||
};
|
||||
|
||||
class MyClass02{
|
||||
public:
|
||||
int mA;
|
||||
static int sB;
|
||||
};
|
||||
|
||||
class MyClass03{
|
||||
public:
|
||||
void printMyClass_1(){
|
||||
cout << "hello world!" << endl;
|
||||
}
|
||||
public:
|
||||
int mA;
|
||||
static int sB;
|
||||
};
|
||||
|
||||
class MyClass04{
|
||||
public:
|
||||
void printMyClass_1(){
|
||||
cout << "hello world!" << endl;
|
||||
}
|
||||
static void ShowMyClass(){
|
||||
cout << "hello world！" << endl;
|
||||
}
|
||||
public:
|
||||
int mA;
|
||||
static int sB;
|
||||
};
|
||||
|
||||
int main(){
|
||||
|
||||
MyClass01 mclass01;
|
||||
MyClass02 mclass02;
|
||||
MyClass03 mclass03;
|
||||
MyClass04 mclass04;
|
||||
|
||||
cout << "MyClass01:" << sizeof(mclass01) << endl; //4
|
||||
//静态数据成员并不保存在类对象中
|
||||
cout << "MyClass02:" << sizeof(mclass02) << endl; //4
|
||||
//非静态成员函数不保存在类对象中
|
||||
cout << "MyClass03:" << sizeof(mclass03) << endl; //4
|
||||
//静态成员函数也不保存在类对象中
|
||||
cout << "MyClass04:" << sizeof(mclass04) << endl; //4
|
||||
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,71 @@
|
||||
// ============================================================================
|
||||
// p1c04_04_02 — 4.4.2.2 this指针的使用
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
#include <cstdio>
|
||||
static inline void pause() { printf("按回车键继续..."); (void)getchar(); }
|
||||
|
||||
// --- 原文片段 [58954456:1] 4.4.2.2 this指针的使用 ---
|
||||
class Person{
|
||||
public:
|
||||
//1. 当形参名和成员变量名一样时，this指针可用来区分
|
||||
Person(string name,int age){
|
||||
//name = name;
|
||||
//age = age; //输出错误
|
||||
this->name = name;
|
||||
this->age = age;
|
||||
}
|
||||
//2. 返回对象本身的引用
|
||||
//重载赋值操作符
|
||||
//其实也是两个参数，其中隐藏了一个this指针
|
||||
Person PersonPlusPerson(Person& person){
|
||||
string newname = this->name + person.name;
|
||||
int newage = this->age + person.age;
|
||||
Person newperson(newname, newage);
|
||||
return newperson;
|
||||
}
|
||||
void ShowPerson(){
|
||||
cout << "Name:" << name << " Age:" << age << endl;
|
||||
}
|
||||
public:
|
||||
string name;
|
||||
int age;
|
||||
};
|
||||
|
||||
//3. 成员函数和全局函数(Perosn对象相加)
|
||||
Person PersonPlusPerson(Person& p1,Person& p2){
|
||||
string newname = p1.name + p2.name;
|
||||
int newage = p1.age + p2.age;
|
||||
Person newperson(newname,newage);
|
||||
return newperson;
|
||||
}
|
||||
|
||||
int main(){
|
||||
|
||||
Person person("John",100);
|
||||
person.ShowPerson();
|
||||
|
||||
cout << "---------" << endl;
|
||||
Person person1("John",20);
|
||||
Person person2("001", 10);
|
||||
//1.全局函数实现两个对象相加
|
||||
Person person3 = PersonPlusPerson(person1, person2);
|
||||
person1.ShowPerson();
|
||||
person2.ShowPerson();
|
||||
person3.ShowPerson();
|
||||
//2. 成员函数实现两个对象相加
|
||||
Person person4 = person1.PersonPlusPerson(person2);
|
||||
person4.ShowPerson();
|
||||
|
||||
pause();
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,7 @@
|
||||
# Auto-generated by tools/gen_part1.py — do not edit by hand.
|
||||
# 章节：p01/ch04/s05
|
||||
add_executable(p1c04_05_01 friend_syntax.cpp)
|
||||
set_target_properties(p1c04_05_01 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_05_01 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_05_01 PRIVATE -Wall -Wextra)
|
||||
add_custom_target(all_p01_ch04_s05 DEPENDS p1c04_05_01)
|
||||
@@ -0,0 +1,73 @@
|
||||
// ============================================================================
|
||||
// p1c04_05_01 — 4.5.1 友元语法
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
#include <cstdio>
|
||||
static inline void pause() { printf("按回车键继续..."); (void)getchar(); }
|
||||
|
||||
// --- 原文片段 [58954457:0] 4.5.1 友元语法 ---
|
||||
class Building;
|
||||
//友元类
|
||||
class MyFriend{
|
||||
public:
|
||||
//友元成员函数
|
||||
void LookAtBedRoom(Building& building);
|
||||
void PlayInBedRoom(Building& building);
|
||||
};
|
||||
class Building{
|
||||
//全局函数做友元函数
|
||||
friend void CleanBedRoom(Building& building);
|
||||
#if 0
|
||||
//成员函数做友元函数
|
||||
friend void MyFriend::LookAtBedRoom(Building& building);
|
||||
friend void MyFriend::PlayInBedRoom(Building& building);
|
||||
#else
|
||||
//友元类
|
||||
friend class MyFriend;
|
||||
#endif
|
||||
public:
|
||||
Building();
|
||||
public:
|
||||
string mSittingRoom;
|
||||
private:
|
||||
string mBedroom;
|
||||
};
|
||||
|
||||
void MyFriend::LookAtBedRoom(Building& building){
|
||||
cout << "我的朋友参观" << building.mBedroom << endl;
|
||||
}
|
||||
void MyFriend::PlayInBedRoom(Building& building){
|
||||
cout << "我的朋友玩耍在" << building.mBedroom << endl;
|
||||
}
|
||||
|
||||
//友元全局函数
|
||||
void CleanBedRoom(Building& building){
|
||||
cout << "友元全局函数访问" << building.mBedroom << endl;
|
||||
}
|
||||
|
||||
Building::Building(){
|
||||
this->mSittingRoom = "客厅";
|
||||
this->mBedroom = "卧室";
|
||||
}
|
||||
|
||||
int main(){
|
||||
|
||||
Building building;
|
||||
MyFriend myfriend;
|
||||
|
||||
CleanBedRoom(building);
|
||||
myfriend.LookAtBedRoom(building);
|
||||
myfriend.PlayInBedRoom(building);
|
||||
|
||||
pause();
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,27 @@
|
||||
# Auto-generated by tools/gen_part1.py — do not edit by hand.
|
||||
# 章节：p01/ch04/s06
|
||||
add_executable(p1c04_06_01 overload_with_friend.cpp)
|
||||
set_target_properties(p1c04_06_01 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_06_01 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_06_01 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_06_02 overload_increment_decrement.cpp)
|
||||
set_target_properties(p1c04_06_02 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_06_02 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_06_02 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_06_03 overload_pointer_operator.cpp)
|
||||
set_target_properties(p1c04_06_03 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_06_03 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_06_03 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_06_04 overload_assignment.cpp)
|
||||
set_target_properties(p1c04_06_04 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_06_04 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_06_04 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_06_05 overload_equality.cpp)
|
||||
set_target_properties(p1c04_06_05 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_06_05 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_06_05 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_06_06 overload_function_call.cpp)
|
||||
set_target_properties(p1c04_06_06 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_06_06 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_06_06 PRIVATE -Wall -Wextra)
|
||||
add_custom_target(all_p01_ch04_s06 DEPENDS p1c04_06_01 p1c04_06_02 p1c04_06_03 p1c04_06_04 p1c04_06_05 p1c04_06_06)
|
||||
@@ -0,0 +1,114 @@
|
||||
// ============================================================================
|
||||
// p1c04_06_04 — 4.6.6 赋值(=)运算符重载
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
#include <cstring>
|
||||
|
||||
// --- 原文片段 [58954458:3] 4.6.6 赋值(=)运算符重载 ---
|
||||
class Person{
|
||||
friend ostream& operator<<(ostream& os,const Person& person){
|
||||
os << "ID:" << person.mID << " Age:" << person.mAge << endl;
|
||||
return os;
|
||||
}
|
||||
public:
|
||||
Person(int id,int age){
|
||||
this->mID = id;
|
||||
this->mAge = age;
|
||||
}
|
||||
//重载赋值运算符
|
||||
Person& operator=(const Person& person){
|
||||
this->mID = person.mID;
|
||||
this->mAge = person.mAge;
|
||||
return *this;
|
||||
}
|
||||
private:
|
||||
int mID;
|
||||
int mAge;
|
||||
};
|
||||
|
||||
//1. =号混淆的地方
|
||||
void test01(){
|
||||
Person person1(10, 20);
|
||||
Person person2 = person1; //调用拷贝构造
|
||||
//如果一个对象还没有被创建，则必须初始化，也就是调用构造函数
|
||||
//上述例子由于person2还没有初始化，所以会调用构造函数
|
||||
//由于person2是从已有的person1来创建的，所以只有一个选择
|
||||
//就是调用拷贝构造函数
|
||||
person2 = person1; //调用operator=函数
|
||||
//由于person2已经创建，不需要再调用构造函数，这时候调用的是重载的赋值运算符
|
||||
}
|
||||
//2. 赋值重载案例
|
||||
void test02(){
|
||||
Person person1(20, 20);
|
||||
Person person2(30, 30);
|
||||
cout << "person1:" << person1;
|
||||
cout << "person2:" << person2;
|
||||
person2 = person1;
|
||||
cout << "person2:" << person2;
|
||||
}
|
||||
//常见错误，当准备给两个相同对象赋值时，应该首先检查一下这个对象是否对自身赋值了
|
||||
//对于本例来讲，无论如何执行这些赋值运算都是无害的，但如果对类的实现进行修改，那么将会出现差异;
|
||||
//3. 类中指针
|
||||
class Person2{
|
||||
friend ostream& operator<<(ostream& os, const Person2& person){
|
||||
os << "Name:" << person.pName << " ID:" << person.mID << " Age:" << person.mAge << endl;
|
||||
return os;
|
||||
}
|
||||
public:
|
||||
Person2(char* name,int id, int age){
|
||||
this->pName = new char[strlen(name) + 1];
|
||||
strcpy(this->pName, name);
|
||||
this->mID = id;
|
||||
this->mAge = age;
|
||||
}
|
||||
#if 1
|
||||
//重载赋值运算符
|
||||
Person2& operator=(const Person2& person){
|
||||
|
||||
//注意:由于当前对象已经创建完毕，那么就有可能pName指向堆内存
|
||||
//这个时候如果直接赋值，会导致内存没有及时释放
|
||||
if (this->pName != NULL){
|
||||
delete[] this->pName;
|
||||
}
|
||||
|
||||
this->pName = new char[strlen(person.pName) + 1];
|
||||
strcpy(this->pName,person.pName);
|
||||
this->mID = person.mID;
|
||||
this->mAge = person.mAge;
|
||||
return *this;
|
||||
}
|
||||
#endif
|
||||
//析构函数
|
||||
~Person2(){
|
||||
if (this->pName != NULL){
|
||||
delete[] this->pName;
|
||||
}
|
||||
}
|
||||
private:
|
||||
char* pName;
|
||||
int mID;
|
||||
int mAge;
|
||||
};
|
||||
|
||||
void test03(){
|
||||
Person2 person1("John",20, 20);
|
||||
Person2 person2("Edward",30, 30);
|
||||
cout << "person1:" << person1;
|
||||
cout << "person2:" << person2;
|
||||
person2 = person1;
|
||||
cout << "person2:" << person2;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test01();
|
||||
test02();
|
||||
test03();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,61 @@
|
||||
// ============================================================================
|
||||
// p1c04_06_05 — 4.6.7 等于和不等于(==、!=)运算符重载
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
#include <cstring>
|
||||
|
||||
// --- 原文片段 [58954458:4] 4.6.7 等于和不等于(==、!=)运算符重载 ---
|
||||
class Complex{
|
||||
public:
|
||||
Complex(char* name,int id,int age){
|
||||
this->pName = new char[strlen(name) + 1];
|
||||
strcpy(this->pName, name);
|
||||
this->mID = id;
|
||||
this->mAge = age;
|
||||
}
|
||||
//重载==号操作符
|
||||
bool operator==(const Complex& complex){
|
||||
if (strcmp(this->pName,complex.pName) == 0 &&
|
||||
this->mID == complex.mID &&
|
||||
this->mAge == complex.mAge){
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
//重载!=操作符
|
||||
bool operator!=(const Complex& complex){
|
||||
if (strcmp(this->pName, complex.pName) != 0 ||
|
||||
this->mID != complex.mID ||
|
||||
this->mAge != complex.mAge){
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
~Complex(){
|
||||
if (this->pName != NULL){
|
||||
delete[] this->pName;
|
||||
}
|
||||
}
|
||||
private:
|
||||
char* pName;
|
||||
int mID;
|
||||
int mAge;
|
||||
};
|
||||
void test(){
|
||||
Complex complex1("aaa", 10, 20);
|
||||
Complex complex2("bbb", 10, 20);
|
||||
if (complex1 == complex2){ cout << "相等!" << endl; }
|
||||
if (complex1 != complex2){ cout << "不相等!" << endl; }
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,33 @@
|
||||
// ============================================================================
|
||||
// p1c04_06_06 — 4.6.8 函数调用符号()重载
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954458:5] 4.6.8 函数调用符号()重载 ---
|
||||
class Complex{
|
||||
public:
|
||||
int Add(int x,int y){
|
||||
return x + y;
|
||||
}
|
||||
int operator()(int x,int y){
|
||||
return x + y;
|
||||
}
|
||||
};
|
||||
void test01(){
|
||||
Complex complex;
|
||||
cout << complex.Add(10,20) << endl;
|
||||
//对象当做函数来调用
|
||||
cout << complex(10, 20) << endl;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test01();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,85 @@
|
||||
// ============================================================================
|
||||
// p1c04_06_02 — 4.6.4 自增自减(++/--)运算符重载
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954458:1] 4.6.4 自增自减(++/--)运算符重载 ---
|
||||
class Complex{
|
||||
friend ostream& operator<<(ostream& os,Complex& complex){
|
||||
os << "A:" << complex.mA << " B:" << complex.mB << endl;
|
||||
return os;
|
||||
}
|
||||
public:
|
||||
Complex(){
|
||||
mA = 0;
|
||||
mB = 0;
|
||||
}
|
||||
//重载前置++
|
||||
Complex& operator++(){
|
||||
mA++;
|
||||
mB++;
|
||||
return *this;
|
||||
}
|
||||
//重载后置++
|
||||
Complex operator++(int){
|
||||
Complex temp;
|
||||
temp.mA = this->mA;
|
||||
temp.mB = this->mB;
|
||||
mA++;
|
||||
mB++;
|
||||
return temp;
|
||||
}
|
||||
//前置--
|
||||
Complex& operator--(){
|
||||
mA--;
|
||||
mB--;
|
||||
return *this;
|
||||
}
|
||||
//后置--
|
||||
Complex operator--(int){
|
||||
Complex temp;
|
||||
temp.mA = mA;
|
||||
temp.mB = mB;
|
||||
mA--;
|
||||
mB--;
|
||||
return temp;
|
||||
}
|
||||
void ShowComplex(){
|
||||
cout << "A:" << mA << " B:" << mB << endl;
|
||||
}
|
||||
private:
|
||||
int mA;
|
||||
int mB;
|
||||
};
|
||||
|
||||
void test(){
|
||||
Complex complex;
|
||||
complex++;
|
||||
cout << complex;
|
||||
++complex;
|
||||
cout << complex;
|
||||
|
||||
Complex ret = complex++;
|
||||
cout << ret;
|
||||
cout << complex;
|
||||
|
||||
cout << "------" << endl;
|
||||
ret--;
|
||||
--ret;
|
||||
cout << "ret:" << ret;
|
||||
complex--;
|
||||
--complex;
|
||||
cout << "complex:" << complex;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,59 @@
|
||||
// ============================================================================
|
||||
// p1c04_06_03 — 4.6.5 指针运算符(*、->)重载
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954458:2] 4.6.5 指针运算符(*、->)重载 ---
|
||||
class Person{
|
||||
public:
|
||||
Person(int param){
|
||||
this->mParam = param;
|
||||
}
|
||||
void PrintPerson(){
|
||||
cout << "Param:" << mParam << endl;
|
||||
}
|
||||
private:
|
||||
int mParam;
|
||||
};
|
||||
|
||||
class SmartPointer{
|
||||
public:
|
||||
SmartPointer(Person* person){
|
||||
this->pPerson = person;
|
||||
}
|
||||
//重载指针的->、*操作符
|
||||
Person* operator->(){
|
||||
return pPerson;
|
||||
}
|
||||
Person& operator*(){
|
||||
return *pPerson;
|
||||
}
|
||||
~SmartPointer(){
|
||||
if (pPerson != NULL){
|
||||
delete pPerson;
|
||||
}
|
||||
}
|
||||
public:
|
||||
Person* pPerson;
|
||||
};
|
||||
|
||||
void test01(){
|
||||
|
||||
//Person* person = new Person(100);
|
||||
//如果忘记释放，那么就会造成内存泄漏
|
||||
|
||||
SmartPointer pointer(new Person(100));
|
||||
pointer->PrintPerson();
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test01();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,39 @@
|
||||
// ============================================================================
|
||||
// p1c04_06_01 — 4.6.2 运算符重载碰上友元函数
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954458:0] 4.6.2 运算符重载碰上友元函数 ---
|
||||
class Person{
|
||||
friend ostream& operator<<(ostream& os, Person& person);
|
||||
public:
|
||||
Person(int id,int age){
|
||||
mID = id;
|
||||
mAge = age;
|
||||
}
|
||||
private:
|
||||
int mID;
|
||||
int mAge;
|
||||
};
|
||||
|
||||
ostream& operator<<(ostream& os, Person& person){
|
||||
os << "ID:" << person.mID << " Age:" << person.mAge;
|
||||
return os;
|
||||
}
|
||||
|
||||
int main(){
|
||||
|
||||
Person person(1001, 30);
|
||||
//cout << person; //cout.operator+(person)
|
||||
cout << person << " | " << endl;
|
||||
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,55 @@
|
||||
# Auto-generated by tools/gen_part1.py — do not edit by hand.
|
||||
# 章节：p01/ch04/s07
|
||||
add_executable(p1c04_07_01 why_inheritance.cpp)
|
||||
set_target_properties(p1c04_07_01 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_07_01 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_07_01 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_07_02 derived_access_control.cpp)
|
||||
set_target_properties(p1c04_07_02 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_07_02 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_07_02 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_07_03 inheritance_object_model.cpp)
|
||||
set_target_properties(p1c04_07_03 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_07_03 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_07_03 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_07_04 inheritance_ctor_dtor_order.cpp)
|
||||
set_target_properties(p1c04_07_04 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_07_04 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_07_04 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_07_05 inheritance_ctor_dtor_order_2.cpp)
|
||||
set_target_properties(p1c04_07_05 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_07_05 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_07_05 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_07_06 same_name_members.cpp)
|
||||
set_target_properties(p1c04_07_06 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_07_06 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_07_06 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_07_07 same_name_members_2.cpp)
|
||||
set_target_properties(p1c04_07_07 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_07_07 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_07_07 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_07_08 static_in_inheritance.cpp)
|
||||
set_target_properties(p1c04_07_08 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_07_08 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_07_08 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_07_09 multiple_inheritance_concept.cpp)
|
||||
set_target_properties(p1c04_07_09 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_07_09 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_07_09 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_07_10 diamond_virtual_inheritance.cpp)
|
||||
set_target_properties(p1c04_07_10 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_07_10 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_07_10 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_07_11 diamond_virtual_inheritance_2.cpp)
|
||||
set_target_properties(p1c04_07_11 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_07_11 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_07_11 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_07_12 virtual_inheritance_mechanism.cpp)
|
||||
set_target_properties(p1c04_07_12 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_07_12 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_07_12 PRIVATE -Wall -Wextra)
|
||||
add_executable(p1c04_07_13 virtual_inheritance_mechanism_2.cpp)
|
||||
set_target_properties(p1c04_07_13 PROPERTIES C_STANDARD 17 C_STANDARD_REQUIRED ON C_EXTENSIONS OFF)
|
||||
set_target_properties(p1c04_07_13 PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
|
||||
target_compile_options(p1c04_07_13 PRIVATE -Wall -Wextra)
|
||||
add_custom_target(all_p01_ch04_s07 DEPENDS p1c04_07_01 p1c04_07_02 p1c04_07_03 p1c04_07_04 p1c04_07_05 p1c04_07_06 p1c04_07_07 p1c04_07_08 p1c04_07_09 p1c04_07_10 p1c04_07_11 p1c04_07_12 p1c04_07_13)
|
||||
@@ -0,0 +1,98 @@
|
||||
// ============================================================================
|
||||
// p1c04_07_02 — 4.7.2 派生类访问控制
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954461:1] 4.7.2 派生类访问控制 ---
|
||||
//基类
|
||||
class A{
|
||||
public:
|
||||
int mA;
|
||||
protected:
|
||||
int mB;
|
||||
private:
|
||||
int mC;
|
||||
};
|
||||
|
||||
//1. 公有(public)继承
|
||||
class B : public A{
|
||||
public:
|
||||
void PrintB(){
|
||||
cout << mA << endl; //可访问基类public属性
|
||||
cout << mB << endl; //可访问基类protected属性
|
||||
//cout << mC << endl; //不可访问基类private属性
|
||||
}
|
||||
};
|
||||
class SubB : public B{
|
||||
void PrintSubB(){
|
||||
cout << mA << endl; //可访问基类public属性
|
||||
cout << mB << endl; //可访问基类protected属性
|
||||
//cout << mC << endl; //不可访问基类private属性
|
||||
}
|
||||
};
|
||||
void test01(){
|
||||
|
||||
B b;
|
||||
cout << b.mA << endl; //可访问基类public属性
|
||||
//cout << b.mB << endl; //不可访问基类protected属性
|
||||
//cout << b.mC << endl; //不可访问基类private属性
|
||||
}
|
||||
|
||||
//2. 私有(private)继承
|
||||
class C : private A{
|
||||
public:
|
||||
void PrintC(){
|
||||
cout << mA << endl; //可访问基类public属性
|
||||
cout << mB << endl; //可访问基类protected属性
|
||||
//cout << mC << endl; //不可访问基类private属性
|
||||
}
|
||||
};
|
||||
class SubC : public C{
|
||||
void PrintSubC(){
|
||||
//cout << mA << endl; //不可访问基类public属性
|
||||
//cout << mB << endl; //不可访问基类protected属性
|
||||
//cout << mC << endl; //不可访问基类private属性
|
||||
}
|
||||
};
|
||||
void test02(){
|
||||
C c;
|
||||
//cout << c.mA << endl; //不可访问基类public属性
|
||||
//cout << c.mB << endl; //不可访问基类protected属性
|
||||
//cout << c.mC << endl; //不可访问基类private属性
|
||||
}
|
||||
//3. 保护(protected)继承
|
||||
class D : protected A{
|
||||
public:
|
||||
void PrintD(){
|
||||
cout << mA << endl; //可访问基类public属性
|
||||
cout << mB << endl; //可访问基类protected属性
|
||||
//cout << mC << endl; //不可访问基类private属性
|
||||
}
|
||||
};
|
||||
class SubD : public D{
|
||||
void PrintD(){
|
||||
cout << mA << endl; //可访问基类public属性
|
||||
cout << mB << endl; //可访问基类protected属性
|
||||
//cout << mC << endl; //不可访问基类private属性
|
||||
}
|
||||
};
|
||||
void test03(){
|
||||
D d;
|
||||
//cout << d.mA << endl; //不可访问基类public属性
|
||||
//cout << d.mB << endl; //不可访问基类protected属性
|
||||
//cout << d.mC << endl; //不可访问基类private属性
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test01();
|
||||
test02();
|
||||
test03();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,40 @@
|
||||
// ============================================================================
|
||||
// p1c04_07_10 — 4.7.6.2 菱形继承和虚继承
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954461:9] 4.7.6.2 菱形继承和虚继承 ---
|
||||
class BigBase{
|
||||
public:
|
||||
BigBase(){ mParam = 0; }
|
||||
void func(){ cout << "BigBase::func" << endl; }
|
||||
public:
|
||||
int mParam;
|
||||
};
|
||||
|
||||
class Base1 : public BigBase{};
|
||||
class Base2 : public BigBase{};
|
||||
class Derived : public Base1, public Base2{};
|
||||
|
||||
int main(){
|
||||
|
||||
Derived derived;
|
||||
//1. 对"func"的访问不明确
|
||||
//derived.func();
|
||||
//cout << derived.mParam << endl;
|
||||
cout << "derived.Base1::mParam:" << derived.Base1::mParam << endl;
|
||||
cout << "derived.Base2::mParam:" << derived.Base2::mParam << endl;
|
||||
|
||||
//2. 重复继承
|
||||
cout << "Derived size:" << sizeof(Derived) << endl; //8
|
||||
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,37 @@
|
||||
// ============================================================================
|
||||
// p1c04_07_11 — 4.7.6.2 菱形继承和虚继承
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954461:10] 4.7.6.2 菱形继承和虚继承 ---
|
||||
class BigBase{
|
||||
public:
|
||||
BigBase(){ mParam = 0; }
|
||||
void func(){ cout << "BigBase::func" << endl; }
|
||||
public:
|
||||
int mParam;
|
||||
};
|
||||
|
||||
class Base1 : virtual public BigBase{};
|
||||
class Base2 : virtual public BigBase{};
|
||||
class Derived : public Base1, public Base2{};
|
||||
|
||||
int main(){
|
||||
|
||||
Derived derived;
|
||||
//二义性问题解决
|
||||
derived.func();
|
||||
cout << derived.mParam << endl;
|
||||
//输出结果:12
|
||||
cout << "Derived size:" << sizeof(Derived) << endl;
|
||||
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,51 @@
|
||||
// ============================================================================
|
||||
// p1c04_07_04 — 4.7.3.2 对象构造和析构的调用原则
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954461:3] 4.7.3.2 对象构造和析构的调用原则 ---
|
||||
class A{
|
||||
public:
|
||||
A(){
|
||||
cout << "A类构造函数!" << endl;
|
||||
}
|
||||
~A(){
|
||||
cout << "A类析构函数!" << endl;
|
||||
}
|
||||
};
|
||||
|
||||
class B : public A{
|
||||
public:
|
||||
B(){
|
||||
cout << "B类构造函数!" << endl;
|
||||
}
|
||||
~B(){
|
||||
cout << "B类析构函数!" << endl;
|
||||
}
|
||||
};
|
||||
|
||||
class C : public B{
|
||||
public:
|
||||
C(){
|
||||
cout << "C类构造函数!" << endl;
|
||||
}
|
||||
~C(){
|
||||
cout << "C类析构函数!" << endl;
|
||||
}
|
||||
};
|
||||
|
||||
void test(){
|
||||
C c;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,59 @@
|
||||
// ============================================================================
|
||||
// p1c04_07_05 — 4.7.3.2 对象构造和析构的调用原则
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954461:4] 4.7.3.2 对象构造和析构的调用原则 ---
|
||||
class D{
|
||||
public:
|
||||
D(){
|
||||
cout << "D类构造函数!" << endl;
|
||||
}
|
||||
~D(){
|
||||
cout << "D类析构函数!" << endl;
|
||||
}
|
||||
};
|
||||
class A{
|
||||
public:
|
||||
A(){
|
||||
cout << "A类构造函数!" << endl;
|
||||
}
|
||||
~A(){
|
||||
cout << "A类析构函数!" << endl;
|
||||
}
|
||||
};
|
||||
class B : public A{
|
||||
public:
|
||||
B(){
|
||||
cout << "B类构造函数!" << endl;
|
||||
}
|
||||
~B(){
|
||||
cout << "B类析构函数!" << endl;
|
||||
}
|
||||
};
|
||||
class C : public B{
|
||||
public:
|
||||
C(){
|
||||
cout << "C类构造函数!" << endl;
|
||||
}
|
||||
~C(){
|
||||
cout << "C类析构函数!" << endl;
|
||||
}
|
||||
public:
|
||||
D c;
|
||||
};
|
||||
void test(){
|
||||
C c;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,36 @@
|
||||
// ============================================================================
|
||||
// p1c04_07_03 — 4.7.3.1 继承中的对象模型
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954461:2] 4.7.3.1 继承中的对象模型 ---
|
||||
class Aclass{
|
||||
public:
|
||||
int mA;
|
||||
int mB;
|
||||
};
|
||||
class Bclass : public Aclass{
|
||||
public:
|
||||
int mC;
|
||||
};
|
||||
class Cclass : public Bclass{
|
||||
public:
|
||||
int mD;
|
||||
};
|
||||
void test(){
|
||||
cout << "A size:" << sizeof(Aclass) << endl;
|
||||
cout << "B size:" << sizeof(Bclass) << endl;
|
||||
cout << "C size:" << sizeof(Cclass) << endl;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
int main() {
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,38 @@
|
||||
// ============================================================================
|
||||
// p1c04_07_09 — 4.7.6.1 多继承概念
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954461:8] 4.7.6.1 多继承概念 ---
|
||||
class Base1{
|
||||
public:
|
||||
void func1_1(){ cout << "Base1::func1_1" << endl; }
|
||||
};
|
||||
class Base2{
|
||||
public:
|
||||
void func1_1(){ cout << "Base2::func1_1" << endl; }
|
||||
void func2(){ cout << "Base2::func2" << endl; }
|
||||
};
|
||||
//派生类继承Base1、Base2
|
||||
class Derived : public Base1, public Base2{};
|
||||
int main(){
|
||||
|
||||
Derived derived;
|
||||
//func1是从Base1继承来的还是从Base2继承来的？
|
||||
//derived.func1_1();
|
||||
derived.func2();
|
||||
|
||||
//解决歧义:显示指定调用那个基类的func1
|
||||
derived.Base1::func1_1();
|
||||
derived.Base2::func1_1();
|
||||
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
@@ -0,0 +1,48 @@
|
||||
// ============================================================================
|
||||
// p1c04_07_06 — 4.7.3 继承中同名成员的处理方法
|
||||
// 来源：川大 C++/LinuxC wiki「02.Qt方向」
|
||||
// 说明：本文件由 gen_part1.py 合并页面中的教学片段而成。每个片段用
|
||||
// // --- 原文片段 [pageId:blockIdx] --- 标注出处。
|
||||
// 已做最小修正（笔误/平台移植），详见 docs/ERRATA.md。
|
||||
// ============================================================================
|
||||
|
||||
#include <iostream>
|
||||
using namespace std;
|
||||
|
||||
// --- 原文片段 [58954461:5] 4.7.3 继承中同名成员的处理方法 ---
|
||||
class Base{
|
||||
public:
|
||||
Base():mParam(0){}
|
||||
void Print(){ cout << mParam << endl; }
|
||||
public:
|
||||
int mParam;
|
||||
};
|
||||
|
||||
class Derived : public Base{
|
||||
public:
|
||||
Derived():mParam(10){}
|
||||
void Print(){
|
||||
//在派生类中使用和基类的同名成员,显示使用类名限定符
|
||||
cout << Base::mParam << endl;
|
||||
cout << mParam << endl;
|
||||
}
|
||||
//返回基类重名成员
|
||||
int& getBaseParam(){ return Base::mParam; }
|
||||
public:
|
||||
int mParam;
|
||||
};
|
||||
|
||||
int main(){
|
||||
|
||||
Derived derived;
|
||||
//派生类和基类成员属性重名，子类访问成员默认是子类成员
|
||||
cout << derived.mParam << endl; //10
|
||||
derived.Print();
|
||||
//类外如何获得基类重名成员属性
|
||||
derived.getBaseParam() = 100;
|
||||
cout << "Base:mParam:" << derived.getBaseParam() << endl;
|
||||
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
// --- main ---
|
||||
Some files were not shown because too many files have changed in this diff Show More
Reference in New Issue
Block a user