71.lambda表达式的递归

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

 void main()
 {
     //&调用外部
     //function<void(void)> fun = [&]()->void {cout << "hello" << endl; fun(); };
     function<void(int)> fun = [&](int i)
     {
         if (i == )
         {
             return ;
         }
         else
         {
             cout << i << endl;
             fun(i-);
         }
     };
     fun();
     system("pause");
 }