Creation of singleton and factory Modes

# Pragma once

Class config

{

PRIVATE:

Static config * con;

Config (void );

Config (const config & con); // copy the constructor to private

Public:

Float CPU;

Float memory;

Float harddisk;

 

~ Config (void );

// Note that the Declaration is static.

Static config * getinstance ();

Void creatinstance ();

// Factory mode statement

Static config * Create ();

};

-----------------------------------------------------------------------------

Config: config (void)

{

}

 

 

Config ::~ Config (void)

{

}

// In Singleton mode, the return type is a class pointer, so that both the constructor method and the copy constructor method are private and only one class object can be created.

Config * config: con = nullptr;

Config * config: getinstance (){

If (con = nullptr)

{

Con = new config ();

Con-> CPU = 3;

Con-> memory = 4;

Con-> maid = 512;

}

Return con;

}

Void creatinstance (){

 

}

// Create factory Mode

Config * config: Create (){

Config * CO = new config ();

Return Co;

Call the main function singleton: config * CP = config: getinstance ();

}