// ============================================================================
//  p1c09_04_02  —  4.2 谓词
//  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>
#include <vector>

// --- 原文片段 [58954498:1]  4.2 谓词 ---
class GreaterThenFive
{
public:
	bool operator()(int num)
	{
		return num > 5;
	}

};
//一元谓词
void test01()
{
	vector<int> v;
	for (int i = 0; i < 10;i ++)
	{
		v.push_back(i);
	}
	
	 vector<int>::iterator it =  find_if(v.begin(), v.end(), GreaterThenFive());
	 if (it == v.end())
	 {
		 cout << "没有找到" << endl;
	 }
	 else
	 {
		 cout << "找到了: " << *it << endl;
	 }
}

//二元谓词
class MyCompare
{
public:
	bool operator()(int num1, int num2)
	{
		return num1 > num2;
	}
};

void test02()
{
	vector<int> v;
	v.push_back(10);
	v.push_back(40);
	v.push_back(20);
	v.push_back(90);
	v.push_back(60);

	//默认从小到大
	sort(v.begin(), v.end());
	for (vector<int>::iterator it = v.begin(); it != v.end();it++)
	{
		cout << *it << " ";
	}
	cout << endl;
	cout << "----------------------------" << endl;
	//使用函数对象改变算法策略，排序从大到小
	sort(v.begin(), v.end(),MyCompare());
	for (vector<int>::iterator it = v.begin(); it != v.end(); it++)
	{
		cout << *it << " ";
	}
	cout << endl;
}

// --- main ---
int main() {
    test01();
    test02();
    return 0;
}
