c++ lambda表达式 C++11 

 1 #include <iostream>
 2 #include <functional>
 3 #include <string>
 4 
 5 
 6 void fun1(std::string i,std::function<int(std::string& y)> send)
 7 {
 8     
 9     std::cout << "fun1:" << std::endl;
10     std::string yy = "fun2";
11     send(yy);
12 }
13 
14 int main()
15 {
16     
17     fun1("123",[&](std::string& y){
18         
19         std::cout << "fun2:"<< y <<  std::endl;
20         return 0;
21     });
22 
23     int a = 123;
24     auto f = [&]{std::cout << a << std::endl;};
25     f();
26     a = 234;
27     f();
28     getchar();
29     return 0;
30 }

输出： g++ -std=c++11 main.cpp

1 fun1:
2 fun2:fun2
3 123
4 234

第24行 

auto f = [&]{std::cout << a << std::endl;};换成
auto f = [=]{std::cout << a << std::endl;};
则输出为 123 123
参考博客 https://www.cnblogs.com/DswCnblog/p/5629165.html
posted @ 2019-01-24 14:36  出来打酱油  阅读(158)  评论(0)  编辑  收藏  举报