"Design mode" single-instance mode C + + implementation

A singleton pattern typically applies to only one object in the entire application. For example, the application class, the game scene class, the tool class and so on.

Implementation method:

Header file Singleton.h:

#ifndef _singleton_h_

#define _singleton_h_

Class csingleton{

Public

For external invocation, this method gets the instance

Static csingleton* getinstance ();

Private

Csingleton ();

Csingleton (const csingleton&);

csingleton& operator= (const csingleton&);

static csingleton* instance;

}

#endif

Implementing File Singleton.cpp

#include "Singleton.h"

constructor function

Csingleton::csingleton () {}

Null copy function to prevent copying

Csingleton::csingleton (const csingleton&) {}

overloading = function to prevent copying

csingleton::csingleton& operate= (const csingleton&) {}

csingleton* csingleton::getinstance () {

if (instance==null)//double judgment, avoid high concurrency, produce multiple instances (this method will add a little overhead)

{

Lock ();

if (instance==null) instance=new Csingleton ();

Unlock ();

}

return instance;

}

"Design mode" single-instance mode C + + implementation