builder模式

对所有组件统一封装，并按一定的顺序组装使用

#include <cstdlib>
#include <iostream>

using namespace std;class Sql{public:? virtual ~Sql(){cout<<"Sql 基类析构"<<endl;}? virtual void Do() = 0;};class SqlAccess:public Sql{public:? virtual ~SqlAccess(){cout<<"SqlAccess 析构"<<endl;}? virtual void Do(){cout<<"Access 牌车轮"<<endl;}};class SqlServer:public Sql{public:? virtual ~SqlServer(){cout<<"SqlServer 析构"<<endl;}? virtual void Do(){cout<<"SqlServer 牌车轮"<<endl;}};class Department{public:? virtual ~Department(){cout<<"Department 基类析构"<<endl;}? virtual void Did() = 0;};class DepartmentAccess:public Department{public:? virtual ~DepartmentAccess(){cout<<"DepartmentAccess 析构"<<endl;}? virtual void Did(){cout<<"DepartmentAccess 牌油箱"<<endl;};};class DepartmentServer:public Department{public:? virtual ~DepartmentServer(){cout<<"DepartmentServer 析构"<<endl;}? virtual void Did(){cout<<"DepartmentServer 牌油箱"<<endl;};};class Builder{public:? virtual ~Builder(){cout<<"Builder 基类析构"<<endl;}? virtual Sql* BuilderSql() = 0;? virtual Department* BuilderDepartment() = 0;};class BuilderAccess:public Builder{public:? virtual ~BuilderAccess(){cout<<"BuilderAccess 析构"<<endl;}? virtual Sql* BuilderSql(){return new SqlAccess;}? virtual Department* BuilderDepartment(){return new DepartmentAccess;}};class BuilderServer:public Builder{public:? virtual ~BuilderServer(){cout<<"BuilderServer 析构"<<endl;}? virtual Sql* BuilderSql(){return new SqlServer;}? virtual Department* BuilderDepartment(){return new DepartmentServer;}};class Director{? Builder* pBui;? Sql* pSql;? Department* pDep;public:? Director(Builder* p){pBui = p;}? ~Director()? {??? delete pBui;??? delete pSql;??? delete pDep;? } ? void Construct()? {??? pSql = pBui->BuilderSql();??? pDep = pBui->BuilderDepartment();? }? void Process()? {??? pSql->Do();??? pDep->Did();? } };//生产摩托车的步骤是一样的 void Product(Director* pDir){?pDir->Construct();?pDir->Process();}int main(int argc,char *argv[]){??? //造一辆ACCESS牌的摩托车 ??? cout<<"---------------------造一辆ACCESS牌的摩托车"<<endl; ??? Director* pDir = new Director(new BuilderAccess);??? Product(pDir);??? cout<<"---------------------清理制造ACCESS摩托车产生的垃圾"<<endl; ??? delete pDir;??? //造一辆Server牌的摩托车 ??? cout<<"---------------------造一辆Server牌的摩托车"<<endl; ??? pDir = new Director(new BuilderServer);??? Product(pDir);??? cout<<"---------------------清理制造Server摩托车产生的垃圾"<<endl; ??? delete pDir;??? system("PAUSE");??? return EXIT_SUCCESS;}

（编辑：李大同）

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