二元谓词

#include<iostream>
#include<vector>
#include<algorithm>

using namespace std;
//二元谓词
class mycompare
{
public:
    bool operator()(int val1, int val2)
    {
        return val1 > val2;
    }
};

void test1()
{
    vector<int> v;
    v.push_back(10);
    v.push_back(20);
    v.push_back(30);
    v.push_back(40);
    v.push_back(50);

    sort(v.begin(), v.end());
    for (vector<int>::iterator it = v.begin(); it != v.end(); it++)
    {
        cout << *it << " ";
    }
    cout << endl;
    sort(v.begin(), v.end(),mycompare());
    for (vector<int>::iterator it = v.begin(); it != v.end(); it++)
    {
        cout << *it << " ";
    }
}

int main()
{

    test1();

    return 0;
}