56.lambda表达式与绑定以及伪函数和绑定

#include <iostream>
#include <functional>
using namespace std;
using namespace std::placeholders;

int add(int a, int b)
{
    return a + b;
}

class myclass
{
public:
    int operator()(int a, int b)
    {
        cout << "a = " << a << " b = " << b << endl;
        return a + b;
    }
};

void main()
{
    //函数包装器
    auto fun = bind(add, 10, 1);
    cout << fun() << endl;
    //lambda表达式与函数包装器
    auto fun1 = bind([](int a, int b)->int {return a + b; }, 100, _1);
    cout << fun1(122) << endl;
    
    myclass my1;
    cout << my1(1, 1) << endl;
    //伪函数和绑定
    //绑定从左到右,可以指定可以不指定
    auto fun3 = bind(my1, 100, _1);
    fun3(4);
    cin.get();
}