Method ~singleton

3rdparty/asyncplusplus/src/singleton.h:48–52

Use a destructor instead of atexit() because the latter does not work properly when the singleton is in a library that is unloaded.

	// Use a destructor instead of atexit() because the latter does not work
	// properly when the singleton is in a library that is unloaded.
	~singleton()
	{
		if (init_flag.load(std::memory_order_acquire))
			reinterpret_cast<T*>(&storage)->~T();
	}

public:
	static T& get_instance()