為什么字符串類沒有預定義的<< operator(operator <<),以便字符串像ostringstreams一樣工作? [英]Why doesn't the string class have a << operator (operator<<) predefined so that strings work like ostringstreams?
為什么可以繼承“ <<”運算符而不能繼承“ >>”運算符? [英]Why “<<” operator can be inherited but “>>” operator can't?