#ifndef SINGLETON_H
#define SINGLETON_H

#include <mutex>

template<typename T>
class Singleton{
public:
    static T* instance()
    {
        if (s_pInstance == nullptr)
        {
            std::lock_guard<std::mutex> mtx(s_mtxInstance);
            if (s_pInstance == nullptr)
            {
                s_pInstance = new T;
            }
        }

        return s_pInstance;
    }

private:
    static T* s_pInstance;
    static std::mutex s_mtxInstance;
};

template<typename T>
T* Singleton<T>::s_pInstance = nullptr;

template<typename T>
std::mutex Singleton<T>::s_mtxInstance;



#endif // SINGLETON_H