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56 lines
1.1 KiB
56 lines
1.1 KiB
5 years ago
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#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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public:
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Singleton_DCLP() {};
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virtual ~Singleton_DCLP()
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{
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if (m_instance)
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delete m_instance;
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};
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Singleton_DCLP( const Singleton_DCLP& ) = delete;
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Singleton_DCLP& operator=( const Singleton_DCLP& ) = delete;
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/** I knowthat c++-11 has the "atomic initializers" and this can be
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* replaced with:
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*
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* static T getInstance()
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* {
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* static Singleton instance;
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* return instance;
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* }
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*
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* But that is not supported in Visual Studio 2012 SP4
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* https://preshing.com/20130930/double-checked-locking-is-fixed-in-cpp11/
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*/
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static T* getInstance()
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{
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if (!m_instance) {
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std::lock_guard<std::mutex> guard(m_lock);
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if (!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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private:
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static std::mutex m_lock;
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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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