网站中英文切换怎麼做,wordpress插件自定义字段,中国工业品网,南通网站设计制作公司工厂模式属于创建型模式#xff0c;大致可以分为三类#xff0c;简单工厂模式、工厂方法模式、抽象工厂模式。二. 工厂方法模式所谓工厂方法模式#xff0c;是指定义一个用于创建对象的接口#xff0c;让子类决定实例化哪一个类。Factory Method使一个类的实例化延迟到其子…工厂模式属于创建型模式大致可以分为三类简单工厂模式、工厂方法模式、抽象工厂模式。二. 工厂方法模式所谓工厂方法模式是指定义一个用于创建对象的接口让子类决定实例化哪一个类。Factory Method使一个类的实例化延迟到其子类。还以刚才的例子解释这家电子厂赚了不少钱于是决定再开设一个厂其中一个工厂专门用来生产A型号的产品也就是只生产电吹风而另一工厂专门用来生产B型号的产品也就是只生产电风扇这样分工明确了。以后客户要再下定单时可以直接找到相关的工厂了比如要A型号的产品就找A工厂要不再担心下的定单是A生产出来的是B产品了。代码实现abstractClass.h#ifndef ABSTRACTCLASS_H#define ABSTRACTCLASS_H#include #include typedef struct {size_t size;void* (*ctor)(void *_self, va_list *params);void* (*dtor)(void *_self);} AbstractClass;#endiffactory.h#ifndef FACTORY_H#define FACTORY_H#include #include typedef struct {size_t size;void* (*ctor)(void *_self, va_list *params);void* (*dtor)(void *_self);void* (*createProduct)(const void *_self);} Factory;#endiffactoryA.h#ifndef FACTORYA_H#define FACTORYA_Htypedef struct {const void *_;} _FactoryA;extern const void *FactoryA;#endiffactoryA.c#include factory.h#include factoryA.h#include productA.h#include new.h#include static void *factoryACtor(void *_self, va_list *params){_FactoryA *self _self;return self;}static void *factoryADtor(void *_self) {_FactoryA *self _self;return self;}static void* factoryACreateProduct(const void *self) {return New(ProductA);}static const Factory _factory {sizeof(_FactoryA),factoryACtor,factoryADtor,factoryACreateProduct};const void *FactoryA _factory;factoryB.h#ifndef FACTORYB_H#define FACTORYB_Htypedef struct {const void *_;} _FactoryB;extern const void *FactoryB;#endiffactoryB.c#include factory.h#include factoryB.h#include productB.h#include new.h#include static void *factoryBCtor(void *_self, va_list *params){_FactoryB *self _self;return self;}static void *factoryBDtor(void *_self) {_FactoryB *self _self;return self;}static void* factoryBCreateProduct(const void *self) {return New(ProductB);}static const Factory _factory {sizeof(_FactoryB),factoryBCtor,factoryBDtor,factoryBCreateProduct};const void *FactoryB _factory;product.h#ifndef PRODUCT_H#define PRODUCT_H#include #include typedef struct {size_t size;void* (*ctor)(void *_self, va_list *params);void* (*dtor)(void *_self);void (*show)(const void *_self);} Product;#endifproductA.h#ifndef PRODUCTA_H#define PRODUCTA_Htypedef struct {const void *_;} _ProductA;extern const void *ProductA;#endifproductA.c#include product.h#include productA.h#include #include static void *productACtor(void *_self, va_list *params) {_ProductA *self _self;return self;}static void *productADtor(void *_self) {_ProductA *self _self;return self;}static void productAShow(const void *_self) {(void)_self;fprintf(stdout, Product A\n);}static const Product _product {sizeof(_ProductA),productACtor,productADtor,productAShow};const void *ProductA _product;productB.h#ifndef PRODUCTB_H#define PRODUCTB_Htypedef struct {const void *_;} _ProductB;extern const void *ProductB;#endifproductB.c#include product.h#include productB.h#include #include #include static void *productBCtor(void *_self, va_list *params) {_ProductB *self _self;return self;}static void *productBDtor(void *_self) {_ProductB *self _self;return self;}static void productBShow(const void *_self) {(void)_self;fprintf(stdout, Product B\n);}static const Product _product {sizeof(_ProductB),productBCtor,productBDtor,productBShow};const void *ProductB _product;new.h#ifndef NEW_H#define NEW_Hvoid *New(const void *_class, ...);void Delete(void *_class);void *CreateProduct(const void *_factory);void Show(const void *product);#endifnew.c#include new.h#include abstractClass.h#include factory.h#include product.h#include #include #include #include void *New(const void *_class, ...) {const AbstractClass *class _class;void *p calloc(1, class-size);assert(p);*(const AbstractClass **)p class;if (class-ctor) {va_list params;va_start(params, _class);p class-ctor(p, ¶ms);va_end(params);}return p;}void Delete(void *_class) {const AbstractClass **class _class;if (_class *class (*class)-dtor) {_class (*class)-dtor(_class);}free(_class);}void *CreateProduct(const void *_factory) {const Factory * const *factory _factory;if (_factory *factory (*factory)-createProduct) {return (*factory)-createProduct(_factory);} else {return NULL;}}void Show(const void *_product) {const Product * const *product _product;if (_product *product (*product)-show) {(*product)-show(_product);}}main.c#include new.h#include factoryA.h#include factoryB.hint main(int argc, char *argv[]) {void *facA New(FactoryA);void *facB New(FactoryB);void *pro1 CreateProduct(facA);void *pro2 CreateProduct(facB);void *pro3 CreateProduct(facA);Show(pro1);Show(pro2);Show(pro3);Delete(facA);Delete(facB);Delete(pro1);Delete(pro2);Delete(pro3);return 0;}图片来源http://blog.csdn.net/hmsiwtv/article/details/9627109
