Method try_push

external/atomic_queue/atomic_queue.h:268–284

public:
    template<class T>
    bool try_push(T&& element) noexcept {
        auto head = head_.load(X);
        if(Derived::spsc_) {
            if(static_cast<int>(head - tail_.load(X)) >= static_cast<int>(static_cast<Derived&>(*this).size_))
                return false;
            head_.store(head + 1, X);
        }
        else {
            do {
                if(static_cast<int>(head - tail_.load(X)) >= static_cast<int>(static_cast<Derived&>(*this).size_))
                    return false;
            } while(ATOMIC_QUEUE_UNLIKELY(!head_.compare_exchange_weak(head, head + 1, X, X))); // This loop is not FIFO.
        }

        static_cast<Derived&>(*this).do_push(std::forward<T>(element), head);
        return true;
    }

    template<class T>
    bool try_pop(T& element) noexcept {