78 lines
2.1 KiB
C++
78 lines
2.1 KiB
C++
// Copyright (c) 2016-2018 Kiwano - Nomango
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#pragma once
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#include <memory>
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#include <mutex>
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// Class that will implement the singleton mode,
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// must use the macro in its delare file
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#ifndef KGE_DECLARE_SINGLETON
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#define KGE_DECLARE_SINGLETON( CLASS ) \
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friend ::kiwano::Singleton< CLASS >; \
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friend ::std::default_delete< CLASS >
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#endif
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namespace kiwano
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{
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template <typename _Ty>
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struct Singleton
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{
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public:
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static inline _Ty* Instance()
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{
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if (!instance_)
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{
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std::call_once(once_, Init);
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}
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return instance_.get();
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}
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static inline void Init()
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{
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if (!instance_) instance_.reset(new (std::nothrow) _Ty);
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}
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static inline void Destroy()
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{
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instance_.reset();
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}
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protected:
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Singleton() = default;
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private:
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Singleton(const Singleton&) = delete;
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Singleton& operator=(const Singleton&) = delete;
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private:
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static std::once_flag once_;
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static std::unique_ptr<_Ty> instance_;
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};
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template <typename _Ty>
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std::once_flag Singleton<_Ty>::once_;
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template <typename _Ty>
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std::unique_ptr<_Ty> Singleton<_Ty>::instance_;
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}
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