简单工厂模式C语言实现

【说明】简单工厂模式的C语言实现，改写自http://blog.csdn.net/sx_wpc/article/details/7645062一文的代码。

【代码清单】

typedef.h

#ifndef __TYPEDEF_H__#define __TYPEDEF_H__#include <stdio.h>#include <stdlib.h>#ifdef __cplusplusextern "C" {#endiftypedef enum _Ret{RET_OK,RET_FAIL}Ret;#define return_if_fail(p)\if(!(p)){\printf("%s:%d Warning:"#p"Failed\n",__func__,__LINE__);\return;}#define return_val_if_fail(p, ret)\if(!(p)){\printf("%s:%d Warning:"#p"Failed\n",__func__,__LINE__);\return (ret);}#define SAFE_FREE(p) if(p != NULL){free(p); p = NULL;}#ifdef __cplusplus}#endif#endif

product.h

#ifndef __PRODUCT_H__#define __PRODUCT_H__#include <assert.h>#include "typedef.h"#ifdef __cplusplusextern "C" {#endifstruct _Operation;typedef struct _Operation Operation;struct _Result;typedef struct _Result Result;typedef Result* (*ResultFunc)(int a, int b);typedef void (*DestroyFunc)(Operation* thiz);struct _Result{int val;};struct _Operation{ResultFunc result;DestroyFunc destroy;};static inline Result* oper_result(Operation *thiz, int a, int b){return_val_if_fail(thiz != NULL, NULL);if(thiz->result != NULL){return thiz->result(a, b);}}static inline void oper_destroy(Operation *thiz){if(thiz != NULL && thiz->destroy != NULL){thiz->destroy(thiz);}return ;}#ifdef __cplusplus}#endif#endif

producta.h

#ifndef __PRODUCTA_H__#define __PRODUCTA_H__#include "product.h"#ifdef __cplusplusextern "C" {#endiftypedef struct _Add Add;typedef Result* (*AddResultFunc)(int a, int b);typedef void (*AddDestroyFunc)(Add* thiz);struct _Add{AddResultFunc add_result;AddDestroyFunc add_destroy;};Add *oper_add_create(void);#ifdef __cplusplus}#endif#endif

producta.c

#include <stdio.h>#include <stdlib.h>#include <assert.h>#include "producta.h"#include "typedef.h"static Result *oper_add_result(int a, int b){Result *result = malloc(sizeof(Result));if(result != NULL){result->val = a + b;}return result;}static void oper_add_destroy(Add *thiz){if(thiz != NULL){SAFE_FREE(thiz);}return ;}Add *oper_add_create(void){Add *thiz = malloc(sizeof(Add));if(thiz != NULL){thiz->add_result = oper_add_result;thiz->add_destroy = oper_add_destroy;}return thiz;}

productb.h

#ifndef __PRODUCTB_H__#define __PRODUCTB_H__#include "product.h"#ifdef __cplusplusextern "C" {#endifstruct _Minus;typedef struct _Minus Minus;typedef Result* (*MinusResultFunc)(int a, int b);typedef void (*MinusDestroyFunc)(Minus* thiz);struct _Minus{MinusResultFunc minus_result;MinusDestroyFunc minus_destroy;};Minus *oper_minus_create(void);#ifdef __cplusplus}#endif#endif

productb.c

#include <stdio.h>#include <stdlib.h>#include <assert.h>#include "productb.h"#include "typedef.h"static Result *oper_minus_result(int a, int b){Result *result = malloc(sizeof(Result));if(result != NULL){result->val = a - b;}return result;}static void oper_minus_destroy(Minus *thiz){if(thiz != NULL){SAFE_FREE(thiz);}}Minus *oper_minus_create(void){Minus *thiz = malloc(sizeof(Minus));if(thiz != NULL){thiz->minus_result = oper_minus_result;thiz->minus_destroy = oper_minus_destroy;}return thiz;}

factory.h

#ifndef __FACTORY_H__#define __FACTORY_H__#include "product.h"#ifdef __cplusplusextern "C" {#endifstruct _Factory;typedef struct _Factory Factory;typedef Operation* (*CreateOperFunc)(char operName);typedef void (*FactoryDestroyFunc)(Factory *thiz);struct _Factory{CreateOperFunc create_oper;FactoryDestroyFunc destroy;};Factory *FactoryCreate(void);Operation* factory_create_oper(char operName);void factory_destroy(Factory *thiz);#ifdef __cplusplus}#endif#endif

factory.c

#include <stdio.h>#include <stdlib.h>#include <assert.h>#include "factory.h"#include "producta.h"#include "productb.h"Operation* factory_create_oper(char operName){Operation *thiz = malloc(sizeof(Operation));if(thiz != NULL){switch(operName){case '+':thiz = (Operation *)oper_add_create();break;case '-':thiz = (Operation *)oper_minus_create();break;default:;}}return thiz;}void factory_destroy(Factory *thiz){if(thiz!= NULL){SAFE_FREE(thiz);}return ;}Factory *FactoryCreate(void){Factory *thiz = malloc(sizeof(Factory));if(thiz != NULL){thiz->create_oper = factory_create_oper;thiz->destroy = factory_destroy;}}

test.c

#include <stdio.h>#include <stdlib.h>#include <assert.h>#include "factory.h"#include "product.h"int main(int argc, char **argv){Factory *factory = FactoryCreate();Operation *oper = factory_create_oper('+');Result* result = oper_result(oper, 3, 5);printf("%d\n", result->val);oper_destroy(oper);factory->destroy(factory);return 0;}

Makefile

exe:=testtemp := $(wildcard test *~) all:test.c factory.c factory.h product.h producta.c producta.h productb.c productb.h typedef.hgcc -g $^ -o $(exe)clean:rm $(temp)

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