C++代码优化.md

1. 返回值检查可以用宏定义

   #define RETURN_FAIL(state, ret)            \
   if (!(state)) {                            \
     std::cout << #state << " execute failed" \
         << std::endl;                        \
     return (ret);                            \
   }
   
   int TestA()
   {
     return false;
   }
   
   int TestAA()
   {
     RETURN_FAIL(TestA(), -2);
     return 0;
   }
   
   int main()
   {
     int ret = TestAA();
     std::cout << "TestAA ret: " << ret << std::endl;
   
     return 0;
   }