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42 lines
786 B
42 lines
786 B
#ifndef SINGLETON_CALL_ONCE_HPP
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#define SINGLETON_CALL_ONCE_HPP
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#include <mutex>
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template<typename T>
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class Singleton_call_once
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{
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protected:
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Singleton_call_once() {};
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virtual ~Singleton_call_once() {};
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private:
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Singleton_call_once( const Singleton_call_once& );
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Singleton_call_once& operator=( const Singleton_call_once& );
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public:
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static T* getInstance()
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{
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std::call_once(m_flag, &Singleton_call_once::do_init);
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return m_instance;
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}
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private:
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static void do_init()
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{
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m_instance = new T();
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}
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static T* m_instance;
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static std::once_flag m_flag;
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};
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template<class T> T* Singleton_call_once<T>::m_instance = 0;
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template<class T> std::once_flag Singleton_call_once<T>::m_flag;
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#endif // SINGLETON_CALL_ONCE_HPP
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