设计模式之构造模式

1类图

 

2c++实现

/*
 * builder.cpp
 *
 *  Created on: 2017年2月7日
 *      Author: admin
 */

#include <string>
#include <iostream>

using namespace std;

class Car{
public:
  const string& getBody() const {
    return body;
  }

  void setBody(const string& body) {
    this->body = body;
  }

  const string& getHead() const {
    return head;
  }

  void setHead(const string& head) {
    this->head = head;
  }

  const string& getTail() const {
    return tail;
  }

  void setTail(const string& tail) {
    this->tail = tail;
  }

private:
  string head;
  string body;
  string tail;
};

class Builder{
public:
  virtual void buildHead()=0;
  virtual void buildBody()=0;
  virtual void buildTail()=0;
  virtual Car * getResult()=0;
  virtual ~Builder(){}
};



class CarBuilder:public Builder{
public:
  CarBuilder(Car *car){
    this->car=car;
  }
public:
  virtual void buildHead(){
    car->setHead("bm head");
  }
  virtual void buildBody(){
    car->setBody("bm body");
  }
  virtual void buildTail(){
    car->setTail("bm tail");
  }
  virtual Car * getResult(){
    return car;
  }
private:
  Car * car;
};

class Director{
public:
  Director(Builder * builder){
    this->builder=builder;
  }
public:
  void build(){
    builder->buildHead();
    builder->buildBody();
    builder->buildTail();
  }
private:
  Builder * builder;
};

int main(){
  Car * car=new Car;
  Builder * builder=new CarBuilder(car);
  Director *director=new Director(builder);
  director->build();
  car=builder->getResult();
  cout<<car->getHead()<<endl;
  cout<<car->getBody()<<endl;
  cout<<car->getTail()<<endl;
  return 0;
}