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 ;
}