// C++ Stream style
    log::info() << "Forking process, child pid = " << pid << " (parent pid = " << ppid << ")" << std::endl;

    // C++ variadic template
    log::info("Forking process, child pid = ", pid, " (parent pid = ", ppid, ")\n");

    // C printf()-family style
    log::info("Forking process, child pid = %d (parent pid = %d)\n", pid, ppid);