Method add

tests/corealgos.h:56–65

	inline T* tail() { return tail_.load(std::memory_order_acquire); }
	
	void add(T* element)
	{
		assert(element != nullptr);
		
		// Add it to the lock-free list
		auto prevTail = tail_.load(std::memory_order_relaxed);
		do {
			element->concurrentListPrev = prevTail;
		} while (!tail_.compare_exchange_weak(prevTail, element, std::memory_order_release, std::memory_order_relaxed));
	}
	
private:
	std::atomic<T*> tail_;