56.lambda表达式与绑定以及伪函数和绑定

 1 #include <iostream>
 2 #include <functional>
 3 using namespace std;
 4 using namespace std::placeholders;
 5 
 6 int add(int a, int b)
 7 {
 8     return a + b;
 9 }
10 
11 class myclass
12 {
13 public:
14     int operator()(int a, int b)
15     {
16         cout << "a = " << a << " b = " << b << endl;
17         return a + b;
18     }
19 };
20 
21 void main()
22 {
23     //函数包装器
24     auto fun = bind(add, 10, 1);
25     cout << fun() << endl;
26     //lambda表达式与函数包装器
27     auto fun1 = bind([](int a, int b)->int {return a + b; }, 100, _1);
28     cout << fun1(122) << endl;
29     
30     myclass my1;
31     cout << my1(1, 1) << endl;
32     //伪函数和绑定
33     //绑定从左到右,可以指定可以不指定
34     auto fun3 = bind(my1, 100, _1);
35     fun3(4);
36     cin.get();
37 }