Well, yes, that's by design, as std::cout is buffered. If you want to have visible debug information, you can either: - call << std::flush; - use << std::end

Well, yes, that's by design, as std::cout is buffered. If you want to have visible debug information, you can either: - call << std::flush; - use << std::endl; which is basically equivalent to << "\n" << std::flush; - use std::cerr instead of std::cout, which is unbuffered.