C++ 单例模式(转载)

转载:http://www.cnblogs.com/cxjchen/p/3148582.html

转载:http://blog.csdn.net/hackbuteer1/article/details/7460019

.h文件

#ifndef _SINGLETON_H_
#define _SINGLETON_H_


class Singleton{
public:
    static Singleton* getInstance();

private:
    Singleton();
    //把复制构造函数和=操作符也设为私有,防止被复制
    Singleton(const Singleton&);
    Singleton& operator=(const Singleton&);

    static Singleton* instance;
};

#endif

.cpp文件

#include "Singleton.h"


Singleton::Singleton(){

}


Singleton::Singleton(const Singleton&){

}


Singleton& Singleton::operator=(const Singleton&){

}


//在此处初始化
Singleton* Singleton::instance = new Singleton();
Singleton* Singleton::getInstance(){
    return instance;
}

main函数

#include "Singleton.h"
#include <stdio.h>


int main(){
    Singleton* singleton1 = Singleton::getInstance();
    Singleton* singleton2 = Singleton::getInstance();

    if (singleton1 == singleton2)
        fprintf(stderr,"singleton1 = singleton2
");

    return 0;
}