Method try_dequeue_from_producer

concurrentqueue.h:1322–1325

	// Never allocates. Thread-safe.
	template<typename U>
	inline bool try_dequeue_from_producer(producer_token_t const& producer, U& item)
	{
		return static_cast<ExplicitProducer*>(producer.producer)->dequeue(item);
	}
	
	// Attempts to dequeue several elements from a specific producer's inner queue.
	// Returns the number of items actually dequeued.