类的单例代码实现

 single.h：

#ifndef SINGLE_H
#define SINGLE_H


class single
{
private:
    static single *p;
protected:
    single();

public:
    static single *makesignle();
    static void releasesingle();
};

#endif // SINGLE_H

single.cpp：

#include "single.h"
#include <iostream>

single *single::p=NULL;


single::single()
{

}

single *single::makesignle()
{
    if(p==NULL)
        p=new single;//如果p为空，就实例化d对象
    return p;
}

void single::releasesingle()
{
    delete p;
}

 main.cpp：

#include <iostream>
#include "single.h"
using namespace std;
//实例化单例出来
int main()
{
    single *p=single::makesignle();

    single *p1=single::makesignle();

    single::releasesingle();
    cout << "Hello World!" << endl;
    return 0;
}

 

来源：CSDN

作者：captionyao

链接：https://blog.csdn.net/qq_38436175/article/details/104092180