void sleep_half_second(const size_t& i, synced_stream* sync_out)
{
    std::this_thread::sleep_for(std::chrono::milliseconds(500));
    sync_out->println("Task ", i, " done.");
}

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
                     )
{
    switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
        break;
    }
    thread_pool* pool;
    synced_stream sync_out;
    int i = 1;
    pool = new thread_pool(12);
    pool->push_task(sleep_half_second, i, &sync_out);

    return TRUE;
}