设计模式读书笔记：Factory Method（工厂方法）

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意图：

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。

结构图：来自《23种设计模式 - 郗晓勇》

实现：https://github.com/panshiqu/patterns/tree/master/FactoryMethod

Creator

namespace NS_FACTORY_METHOD {class Product;class Creator {public:Creator() {}virtual ~Creator() {}virtual Product *createProduct(void) = 0;};template <class TheProduct>class StandardCreator : public Creator {public:StandardCreator() {}virtual ~StandardCreator() {}virtual Product *createProduct(void);};template <class TheProduct>Product *StandardCreator<TheProduct>::createProduct(void) {return new TheProduct;}} /* namespace NS_FACTORY_METHOD */

Product

namespace NS_FACTORY_METHOD {class Product {public:Product() {}virtual ~Product() {}virtual void printSelf(void) = 0;};} /* namespace NS_FACTORY_METHOD */

ConcreteProduct

#include <iostream>#include "Creator.h"#include "Product.h"namespace NS_FACTORY_METHOD {class ConcreteProduct : public Product{public:ConcreteProduct() {}virtual ~ConcreteProduct() {}virtual void printSelf(void){std::cout << "ConcreteProduct" << std::endl;}};StandardCreator<ConcreteProduct> ConcreteCreator;} /* namespace NS_FACTORY_METHOD */

main

#include "FactoryMethod/ConcreteProduct.h"using namespace NS_FACTORY_METHOD;int main(void){Product *product = ConcreteCreator.createProduct();product->printSelf();delete product;}

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