Singleton.hxx

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//
//  Singleton.hpp
//
//  Created by JiangZhping on 2017/2/1.
//  Copyright © 2017年 JiangZhping. All rights reserved.
//
 
#ifndef Singleton_hpp
#define Singleton_hpp
 
#include <cstdio>
 
template<class T>
class Singleton {
public:
    template<typename... Args>
    static T &getInstance(Args... args) {
        if (!m_pInstance) [[unlikely]] {
            m_pInstance = new T(std::forward<Args>(args)...);
        }
 
        return *m_pInstance;
    }
 
protected:
    Singleton();
 
    ~Singleton();
 
private:
    Singleton(Singleton const &);
 
    Singleton &operator=(Singleton const &);
 
    static T *m_pInstance; 
};
 
template<class T> T *Singleton<T>::m_pInstance = nullptr;
 
#endif /* Singleton_hpp */