How to disable std::clog logging from source code?

Question

When developing code, I have many console logging ( std::clog ) and some console output ( std::cout ). But now, I wanted to do online submission of my source code and I want to disable all the console logging ( clog ) but keep the console output ( cout )

I can surely comment all of my //std::clog , but is there a better way to disable all logging inside my source file,?

Answer 1

You can redirect clog, create your own ofstream and use rdbuf function.

std::ofstream nullstream;
std::clog.rdbuf(nullstream.rdbuf());

Answer 2

Copied from Andreas Papadopoulos' answer to a slightly different question -- be sure to upvote him there!

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Sure, you can ( example here ):

int main() {
    std::clog << "First message" << std::endl;

    std::clog.setstate(std::ios_base::failbit);
    std::clog << "Second message" << std::endl;

    std::clog.clear();
    std::clog << "Last message" << std::endl;

    return 0;
}

Outputs:

First message
Last message

This is because putting the stream in fail state will make it silently discard any output, until the failbit is cleared.