Question

I’m having problems using a ostream in my logger class. For some reason, the std::endl is never printed out and so no newline is added. I am sure there is something wrong, I’m having problems trying to understand how to use my ostream in my own classes so I have probably done something fundamentaly wrong.

class MyStreamBuf : public std::streambuf
{
    public:
    MyStreamBuf() : std::streambuf() 
    {

    }
};

class MyLogger : public std::ostream
{
public:
    MyLogger(MyStreamBuf* buf) : std::ostream(buf) { mBuf = buf; }
    ~MyLogger() { delete mBuf; }

    template <typename T>
    inline MyLogger& operator << (T const& value)
    {
#ifdef _WIN32 || _WIN64
        std::cout << value;
#endif

        return *this;
    }

    inline std::ostream& operator << (std::ostream& (*f)(std::ostream&))
    {

        return f(*this);
    }

    MyStreamBuf* mBuf;
};



int _tmain(int argc, _TCHAR* argv[])
{
    MyStreamBuf* buf = new MyStreamBuf();
    MyLogger logger(buf);
    logger << "kekekek" << "asdf: " << 23 << std::endl;
    logger << "kekekek" << "asdf: " << 23 << std::endl;;

    getchar();
    return 0;
}

Output:

kekekekasdf: 23kekekekasdf: 23

Answer 1

Try this:

inline std::ostream& operator << (std::ostream& (*f)(std::ostream&))
{
        std::cout << f;
        return *this;
}