本文主要向大家介绍了C++语言：单例模式，通过具体的内容向大家展示，希望对大家学习C++语言有所帮助。

C++实现单例模式的三种方法

#define _CRT_SECURE_NO_WARNINGS

#include <iostream>

#include <mutex>

using namespace std;

class singleton

{

public:

static singleton *getInstance();

private:

singleton() = default;

singleton(const singleton &sle) {}

static mutex mtx;

static singleton *instance;

};

singleton *singleton::instance;

mutex singleton::mtx;

// 懒汉式

singleton *singleton::getInstance()

{

mtx.lock();

if (instance == NULL)

{

instance = new singleton;

}

mtx.unlock();

return instance;

}

// 双重锁式

singleton *singleton::getInstance()

{

    if (instance == NULL)

    {

        mtx.lock();

if (instance == NULL)

{

instance = new singleton();

}

mtx.unlock();

    }

    return instance;

}

// 饿汉式

singleton *singleton::instance = new singleton;

singleton *singleton::getInstance()

{

return instance;

}

void test()

{

singleton *sle1 = singleton::getInstance();

singleton *sle2 = singleton::getInstance();

cout << sle1 << endl;

cout << sle2 << endl;

/*singleton sle3 = *sle1;

cout << &sle3 << endl;*/

}

int main(void)

{

test();

system("pause");

return 0;

}    

　　要适当的注销代码...

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