Function noisy_function

tests/test_iostream.cpp:20–26

#include <thread>

void noisy_function(const std::string &msg, bool flush) {

    std::cout << msg;
    if (flush) {
        std::cout << std::flush;
    }
}

void noisy_funct_dual(const std::string &msg, const std::string &emsg) {
    std::cout << msg;