class MazeBuilder
{
public：virtual void BuildMaze() {}virtual void BuildRoom(int room) {}virtual void BuildDoor(int roomFrom, int roomTo) {}virtual Maze* GetMaze() { return 0;}
protected:MazeBuilder();
}class StandardMazeBuilder : public MazeBuilder {public:StandardMazeBuilder();/**/virtual void BuildMaze();virtual void BuildRoom(int);virtual void BuildDoor(int, int);/**/virtual Maze* GetMaze();private:Direction CommonWall(Room*, Room*);Maze* _currentMaze;};//StandardMazeBuilder是ConcreteBuilder，提供部件的具体构造代码

Maze* MazeGame::CreateMaze (MazeBuilder& builder) {builder.BuildMaze();builder.BuildRoom(1);builder.BuildRoom(2);builder.BuildDoor(1, 2);return builder.GetMaze();}//CreateMaze是导向器，调用生成器的抽象接口完成产品的构造过程。//下面代码描述产品的构造过程

Maze* maze;//最终的产品

MazeGame game;//Director，导航者

StandardMazeBuilder builder;//ConcreteBuilder，实际的构造类

game.CreateMaze(builder);//开始装配

maze = builder.GetMaze();//获取装配后的产品

StandardMazeBuilder::StandardMazeBuilder(): m_currentMaze(0)
{
}void StandardMazeBuilder::BuildMaze()
{m_currentMaze = new Maze();
}void StandardMazeBuilder::BuildRoom(int roomNo)
{if (m_currentMaze->RoomNo(roomNo) == NULL){Room *room = new Room(roomNo);room->SetSide(Room::East, new Wall());room->SetSide(Room::South, new Wall());room->SetSide(Room::West, new Wall());room->SetSide(Room::North, new Wall());m_currentMaze->AddRoom(room);}
}void StandardMazeBuilder::BuildDoor(int roomFrom, int roomTo)
{Room *r1 = m_currentMaze->RoomNo(roomFrom);Room *r2 = m_currentMaze->RoomNo(roomTo);Door *door = new Door(r1, r2);r1->SetSide(CommononWall(r1, r2), door);r2->SetSide(CommononWall(r2, r1), door);
}Room::Direction StandardMazeBuilder::CommononWall(Room *from, Room *to)
{
}