The factory method pattern of C + + design mode

From: http://blog.csdn.net/pangshaohua/article/details/38912555

Refer to a factory demo written

1. Define "abstract class of background style" and "abstract factory of background style"

1 #pragmaOnce2 /*abstract class background style*/3 classCbackgroundstyle4 {5  Public:6     Virtual voidDisplaystyle () =0;//Pure virtual function7 };8 9 Ten /*Abstract Factory background style*/ One classstylefactory A { -  Public: -     //Factory method, the creation process of the specific background style is done by subclasses the     Virtualcbackgroundstyle* createbackgroundstylefactory () =0; -     voidDisplaystyle () -{//Display Style -M_pbackgroundstyle =createbackgroundstylefactory (); +M_pbackgroundstyle->Displaystyle (); -     } +  A  Public: at stylefactory (): M_pbackgroundstyle (NULL) -     { -  -     } -~stylefactory () -     { in         if(NULL! =M_pbackgroundstyle) -         { to             DeleteM_pbackgroundstyle; +M_pbackgroundstyle =NULL; -         } the     } *  $ Private:Panax Notoginseng     //Save the created background style -cbackgroundstyle*M_pbackgroundstyle; the};

2. Define "trend style background class" and "trend Style factory class"

FashionStyle.h

1 //FashionStyle.h2 #pragmaOnce3 /*Trend style Background class*/4 classCfashionstyle: PublicCbackgroundstyle5 {6  Public:7Cfashionstyle (void);8~cfashionstyle (void);9  Public:Ten     Virtual voidDisplaystyle (); One }; A  - /*Trendy Style factory*/ - classFashionstylefactory: Publicstylefactory the { -     Virtualcbackgroundstyle*createbackgroundstylefactory () -     { -cbackgroundstyle* Pfashionstyle =NewCfashionstyle (); +         returnPfashionstyle; -     }; +};

FashionStyle.cpp

1#include"StdAfx.h"2#include"BackgroundStyle.h"3#include"FashionStyle.h"4 5Cfashionstyle::cfashionstyle (void)6 {7 }8 9 TenCfashionstyle::~cfashionstyle (void) One { A } -  - voidCfashionstyle::D isplaystyle () the { -AfxMessageBox (_t ("Trendy style background")); -}

Invocation mode

1 void cloaddlldemodlg::onbnclickedbutton18 () 2 {// Factory mode 3     new  fashionstylefactory (); 4     Pfactory->Displaystyle (); 5     Delete pfactory; 6     Pfactory = NULL; 7 }

The factory method pattern of C + + design mode