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54 lines
930 B
54 lines
930 B
#ifndef SINGLETON_DCLP_HPP
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#define SINGLETON_DCLP_HPP
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#include <mutex>
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template<typename T>
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class Singleton_DCLP
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{
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protected:
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Singleton_DCLP() {};
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virtual ~Singleton_DCLP() {};
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private:
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Singleton_DCLP( const Singleton_DCLP& );
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Singleton_DCLP& operator=( const Singleton_DCLP& );
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public:
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static T* getInstance()
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{
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if ( not m_instance ) {
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std::lock_guard<std::mutex> guard(m_lock);
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if ( not m_instance ) {
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volatile T *temp = new T();
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m_instance = (T*)temp;
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}
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}
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return (T*)m_instance;
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}
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static void destroy()
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{
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delete m_instance;
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}
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private:
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static std::mutex m_lock;
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// instance double check shall not be cached
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static volatile T* m_instance;
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};
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template<class T> std::mutex Singleton_DCLP<T>::m_lock;
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template<class T> volatile T* Singleton_DCLP<T>::m_instance = 0;
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#endif // SINGLETON_DCLP_HPP
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