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51 lines
786 B
51 lines
786 B
3 years ago
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#ifndef SINGLETON_H
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#define SINGLETON_H
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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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#endif // SINGLETON_H
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