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\n");

    return ;

}