// AUTOGENERATED COPYRIGHT HEADER START
// Copyright (C) 2023 Michael Fabian 'Xaymar' Dirks <info@xaymar.com>
// AUTOGENERATED COPYRIGHT HEADER END

#pragma once
#include "warning-disable.hpp"
#include <memory>
#include <mutex>
#include "warning-enable.hpp"

namespace streamfx::util {
	/** Reference counted Singleton implementation
	 *
	 * Call _classname::instance() to get a reference, which will self-delete when not referenced anymore.
	 * 
	 */
	template<class _type>
	class singleton : public std::enable_shared_from_this<_type> {
		public:
		static std::shared_ptr<_type> instance()
		{
			static std::weak_ptr<_type> winst;
			static std::mutex               mtx;
			std::unique_lock<decltype(mtx)> lock(mtx);

			auto ptr = winst.lock();
			if (!ptr) {
				ptr   = std::shared_ptr<_type>(new _type());
				winst = ptr;
			}
			return ptr;
		}
	};
} // namespace streamfx::util