How to use my logging class like a std C++ stream?

Question

I\'ve a working logger class, which outputs some text into a richtextbox (Win32, C++). Problem is, i always end up using it like this:

stringstream ss;  
ss          


        

Answer 1

An elegant solution that also solves the flushing issues is the following:

#include 
#include 
#include 
#include 

class Logger
{
    using Stream = std::ostringstream;
    using Buffer_p = std::unique_ptr>;

public:
    void log(const std::string& cmd) {
        std::cout << "INFO: " << cmd << std::endl;
    }

    Buffer_p log() {
        return Buffer_p(new Stream, [&](Stream* st) {
            log(st->str());
        });
    }
};

#define LOG(instance) *(instance.log())

int main()
{
    Logger logger;
    LOG(logger) << "e.g. Log a number: " << 3;
    return 0;
}