redirect std::cout to a custom writer

Question

I want to use this snippet from Mr-Edd\'s iostreams article to print std::clog somewhere.

#include 
#include 
#include 

        

Answer 1

I encourage you to look at Boost.IOStreams. It seems to fit your use-case nicely, and using it is surprisingly simple:

#include  
#include 
#include 

namespace bio = boost::iostreams;

class MySink : public bio::sink
{
public:
    std::streamsize write(const char* s, std::streamsize n)
    {
        //Do whatever you want with s
        //...
        return n;
    }
};

int main()
{
    bio::stream_buffer sb;
    sb.open(MySink());
    std::streambuf * oldbuf = std::clog.rdbuf(&sb);
    std::clog << "hello, world" << std::endl;
    std::clog.rdbuf(oldbuf);
    return 0;
}