学步园

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类图：

代码实现：

头声明：

/********************************************************************<br /> File: builder.h<br /> Author: blackboy blackboycpp@gmail.com<br /> Purpose: 生成器模式<br /> Created: 2011-03-15<br /> Modified: 2011-03-16 15:40<br /> *********************************************************************/</p> <p>#ifndef __BUILDER_H__<br /> #define __BUILDER_H__</p> <p>namespace blackboycpp<br /> {<br /> class ProductA;<br /> class ProductB;<br /> class Builder;</p> <p> //////////////////////////////////////////////////////////////////////////<br /> // Director<br /> class Director<br /> {<br /> public:<br /> void Construct(Builder* builder);<br /> };</p> <p> //////////////////////////////////////////////////////////////////////////<br /> // Builders<br /> class Builder<br /> {<br /> public:<br /> // 注意，以下2函数不能声明为纯虚函数，这样派生类可以不必非得实现<br /> virtual void BuildPartA();<br /> virtual void BuildPartB();<br /> };</p> <p> class ConcreteBuilderA : public Builder<br /> {<br /> public:<br /> ConcreteBuilderA();<br /> public:<br /> virtual void BuildPartA();<br /> virtual void BuildPartB();<br /> virtual ProductA* GetProductA() { return _productA; }<br /> private:<br /> ProductA* _productA;<br /> };</p> <p> class ConcreteBuilderB : public Builder<br /> {<br /> public:<br /> ConcreteBuilderB();<br /> public:<br /> virtual void BuildPartA();<br /> virtual ProductB* GetProductB() { return _productB; }<br /> private:<br /> ProductB* _productB;<br /> };</p> <p> //////////////////////////////////////////////////////////////////////////<br /> // Products<br /> class ProductA<br /> {<br /> };</p> <p> class ProductB<br /> {<br /> };</p> <p>}</p> <p>#endif

类实现：

#include <iostream><br /> #include "builder.h"</p> <p>namespace blackboycpp<br /> {<br /> void Director::Construct(Builder* builder)<br /> {<br /> std::cout << "Director::Construct(Builder*)/n";<br /> builder->BuildPartA();<br /> builder->BuildPartB();<br /> }</p> <p> void Builder::BuildPartA()<br /> {<br /> std::cout << "Builder::BuildPartA()/n";<br /> }</p> <p> void Builder::BuildPartB()<br /> {<br /> std::cout << "Builder::BuildPartB()/n";<br /> }</p> <p> ConcreteBuilderA::ConcreteBuilderA()<br /> {<br /> std::cout << "ConcreteBuilderA::ConcreteBuilderA()/n";<br /> _productA = new ProductA;<br /> }</p> <p> void ConcreteBuilderA::BuildPartA()<br /> {<br /> std::cout << "ConcreteBuilderA::BuildPartA()/n";<br /> }</p> <p> void ConcreteBuilderA::BuildPartB()<br /> {<br /> std::cout << "ConcreteBuilderA::BuildPartB()/n";<br /> }</p> <p> ConcreteBuilderB::ConcreteBuilderB()<br /> {<br /> std::cout << "ConcreteBuilderB::ConcreteBuilderB()/n";<br /> _productB = new ProductB;<br /> }</p> <p> void ConcreteBuilderB::BuildPartA()<br /> {<br /> std::cout << "ConcreteBuilderB::BuildPartA()/n";<br /> }<br /> }<br />

main()：

#include <cstdlib><br /> #include "builder.h"<br /> using namespace blackboycpp;</p> <p>int main(int argc, char** argv)<br /> {<br /> Director* director = new Director;<br /> ConcreteBuilderA* builderA = new ConcreteBuilderA;<br /> director->Construct(builderA);<br /> ProductA* productA = builderA->GetProductA();</p> <p> delete productA;<br /> delete builderA;<br /> delete director;</p> <p> system("pause");<br /> return 0;<br /> }