How to call operator<< on "this" in a descendant of std::stringstream?

Question

class mystream : public std::stringstream
{
public:
    void write_something()
    {
        this << "something";
    }
};

This results in the following two compile errors on VC++10:

error C2297: '<<' : illegal, right operand has type 'const char [10]'
error C2296: '<<' : illegal, left operand has type 'mystream *const '

Judging from the second one, this is because what this points at can't be changed, but the << operator does (or at least is declared as if it does). Correct?

Is there some other way I can still use the << and >> operators on this?

Answer 1

mystream *const表示这this是一个指向非常量对象的常量指针.问题是您正在尝试将流插入到指针中 - 您必须插入到流中.请尝试以下方法.

*this << "something";