2.一元谓词

#include<iostream>
using namespace std;

#include<vector>

//返回bool类型的仿函数称为谓词
//如果operator()接收一个参数，叫做一元谓词
//如果operator()接收两个参数，叫做两元谓词

class GreaterFive
{
public:
    bool operator()(int val)
    {
        return val > 5;
    }
};
void test0201()
{
    vector<int> v;
    for (int i = 0; i < 10; i++)
    {
        v.push_back(i);
    }

    //查找容器中有没有大于5的数字
    //GreaterFive()为匿名函数对象
    vector<int>::iterator it = find_if(v.begin(),v.end(),GreaterFive());

    if (it == v.end())
    {
        cout << "未找到" << endl;
    }
    else
    {
        cout << "找到了大于5的数：" << (*it);
    }
    
}

int main()
{
    test0201();

    system("pause");
    return 0;
}