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53 lines
807 B
53 lines
807 B
/* |
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* Copyright (C) 2022 Riyyi |
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* |
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* SPDX-License-Identifier: MIT |
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*/ |
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#pragma once |
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#include <cassert> |
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namespace Util { |
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template<typename T> |
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class Singleton { |
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public: |
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static inline T& the() |
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{ |
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if (s_instance == nullptr) { |
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s_instance = new T { s {} }; |
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} |
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return *s_instance; |
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} |
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static inline void destroy() |
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{ |
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if (s_instance) { |
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delete s_instance; |
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} |
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s_instance = nullptr; |
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} |
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// Remove copy constructor and copy assignment operator |
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Singleton(const Singleton&) = delete; |
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Singleton& operator=(const Singleton&) = delete; |
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Singleton(Singleton&&) = delete; |
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Singleton& operator=(Singleton&&) = delete; |
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protected: |
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Singleton() {} |
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// Constructor token |
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struct s {}; |
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private: |
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static T* s_instance; |
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}; |
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template<typename T> |
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T* Singleton<T>::s_instance = nullptr; |
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} // namespace Util
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