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.youkuaiyun.com/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 __cplusplus
extern "C" {
#endif

typedef 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 __cplusplus
extern "C" {
#endif

struct _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 __cplusplus
extern "C" {
#endif

typedef 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 __cplusplus
extern "C" {
#endif

struct _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 __cplusplus
extern "C" {
#endif

struct _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:=test
temp := $(wildcard test *~) 

all:test.c factory.c factory.h product.h producta.c producta.h productb.c productb.h typedef.h
	gcc -g $^ -o $(exe)

clean:
	rm $(temp)

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