void start_impl()

in include/unifex/win32/windows_thread_pool.hpp [509:542]
26 lines of code
6 McCabe index (conditional complexity)

    void start_impl(const StopToken& stopToken, FILETIME dueTime) noexcept {
        auto startTimer = [&]() noexcept {
            const DWORD periodInMs = 0;   // Single-shot
            const DWORD maxDelayInMs = 0; // Max delay to allow timer coalescing 
            ::SetThreadpoolTimer(timer_, &dueTime, periodInMs, maxDelayInMs);
        };

        if constexpr (!is_stop_never_possible_v<StopToken>) {
            auto* const state = state_;
            if (state != nullptr) {
                // Short-circuit extra work submitting the
                // timer if stop has already been requested.
                if (stopToken.stop_requested()) {
                    set_done_impl();
                    return;
                }

                stopCallback_.construct(stopToken, stop_requested_callback{*this});

                startTimer();

                const auto prevState = state->fetch_add(submit_complete_flag, std::memory_order_acq_rel);
                if ((prevState & stop_requested_flag) != 0) {
                    complete_with_done();
                } else if ((prevState & running_flag) != 0) {
                    delete state;
                }

                return;
            }
        }

        startTimer();
    }