C++11 单例模式

#ifndef SINGLETON_H
#define SINGLETON_H

#include 
#include 

class Singleton {
public:
    static Singleton& GetInstance();
    Singleton(const Singleton&) = delete;
    Singleton operator=(const Singleton&) = delete;
    ~Singleton() {}
private:
    Singleton() {}
};

#endif

#include "Singleton.h"

static std::mutex g_mtx = {};

Singleton& Singleton::GetInstance()
{
    std::unique_lock lock(g_mtx);
    static Singleton singleton;
    return singleton;
}