C++11 Lambda函数(匿名函数)-GCC 4.9编译通过

#include <iostream> using namespace std; int main() { int a = 5, b = 7; auto total = [](int x, int y)->int {return x + y; }; //接受两个参数 cout << total(a, b)<<endl; //12 auto fun1 = [=] {return a + b; }; //值传递捕捉父作用域变量 cout << fun1() << endl; //12 auto fun2 = [&](int c) {b = a + c; a = 1; }; //省略了返回值类型，引用捕获所有 fun2(3); //1 8 cout << a <<" "<< b << endl; a = 5; b = 7; //被修改后，重新赋值 auto fun3 = [=, &b](int c) mutable {b = a + c; a = 1; }; //以值传递捕捉的变量，在函数体里如果要修改，要加mutaple,因为默认const修饰 fun3(3); cout << a << " " <<b<< endl; //5,8 a = 5; b = 7; //被修改后，重新赋值 auto fun4 = [=](int x, int y) mutable->int {a += x; b += y; return a + b; };//a、b在内部发生了变化，外部不受影响 int t = fun4(10, 20); cout << t << endl; //42 cout << a <<" "<< b << endl; //5 7 return 0; }

Output:

12 12 1 8 5 8 42 5 7