class Builder  {  public:    virtual void SelectCpu()= 0;    virtual void SelectMatherboard() = 0;    virtual void SelectMem() = 0;    virtual void SelectDisk() = 0;    virtual void SelectPower() = 0;    virtual void SelectShell() = 0;  };  //構造PC  class PCBuilder : public Builder  {  public:    void SelectCpu()     { cout<<"Select PC Cpu"<<endl; }    void SelectMatherboard() { cout<<"Select PC Matherboard"<<endl; }    void SelectMem()     { cout<<"Select PC Mem"<<endl; }    void SelectDisk()    { cout<<"Select PC Disk"<<endl; }    void SelectPower()    { cout<<"Select PC Power"<<endl; }    void SelectShell()    { cout<<"Select PC Shell"<<endl; }  };  //構造Notebook  class NoteBookBuilder : public Builder  {  public:    void SelectCpu()     { cout<<"Select NoteBook Cpu"<<endl; }    void SelectMatherboard() { cout<<"Select NoteBook Matherboard"<<endl; }    void SelectMem()     { cout<<"Select NoteBook Mem"<<endl; }    void SelectDisk()    { cout<<"Select NoteBook Disk"<<endl; }    void SelectPower()    { cout<<"Select NoteBook Power"<<endl; }    void SelectShell()    { cout<<"Select NoteBook Shell"<<endl; }  };  //構造的指揮官  class Director  {  private:    Builder *m_pBuilder;  public:    Director(Builder *builder) { m_pBuilder = builder; }    void Create(){    m_pBuilder->SelectCpu();    m_pBuilder->SelectMatherboard();    m_pBuilder->SelectMem();    m_pBuilder->SelectDisk();    m_pBuilder->SelectPower();    m_pBuilder->SelectShell();    }  };    //調用  int main()  {    NoteBookBuilder thin;    Director director(&thin);    director.Create();    return 0;  }