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39 lines
946 B
C++
39 lines
946 B
C++
#pragma once
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#include <memory>
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#include <mutex>
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#include <utility> // for std::forward
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template<typename T>
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class Singleton {
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public:
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template<typename ...Args>
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static T* GetInstance(Args&&... args) {
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if (!m_instance) {
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std::call_once(m_onceFlag, [] {
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m_instance.reset(new T(std::forward<Args>(args)...));
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});
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}
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return m_instance.get();
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}
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protected:
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Singleton() = default;
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virtual ~Singleton() = default;
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private:
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Singleton(const Singleton&) = delete;
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Singleton(Singleton&&) = delete;
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Singleton& operator=(const Singleton&) = delete;
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Singleton& operator=(Singleton&&) = delete;
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private:
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static std::unique_ptr<T> m_instance;
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static std::once_flag m_onceFlag;
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};
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template<typename T>
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std::unique_ptr<T> Singleton<T>::m_instance;
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template<typename T>
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std::once_flag Singleton<T>::m_onceFlag;
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