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, , );
     cout << fun() << endl;
     //lambda表达式与函数包装器
     auto fun1 = bind([](int a, int b)->int {return a + b; }, , _1);
     cout << fun1() << endl;

     myclass my1;
     cout << my1(, ) << 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, , _1);
     fun3();
     cin.get();
 }