Copy Controlレプリケーション制御(レプリケーションコンストラクタcopy constructor,解析関数destructor,賦値オペレータoperator=

#include <iostream>



using namespace std;



class Point{

public:

    Point(int cx,int cy):x(cx),y(cy){

        pData=new int;

        *pData = 0;

    }

    Point(const Point& pt)  //copy constructor

    {

        x=pt.getX();

        this->y=pt.getY();

        pData=new int;

        *pData=pt.getData();

    }

    void to_str(){

        cout<<"x="<<x<<",y="<<y<<",*pData="<<*pData<<endl;

    }

    void setX(int x){

        this->x=x;

    }

    void setY(int y)

    {

        this->y=y;

    }

    void setData(int data)

    {

        *pData=data;

    }

    int getX() const

    {

        return x;

    }

    int  getY() const

    {

        return y;

    }

    int  getData() const

    {

        return *pData;

    }

    virtual ~ Point()

    {

        delete pData;

    }

private:

    int x,y,*pData;



};



int main()

{

    Point pt(1,2);

    pt.setData(123);

    pt.to_str();



    cout<<"Hello "<<endl;

    Point pt2(pt);

    pt2.setX(11);

    pt2.setY(22);

    pt2.setData(112233);



    pt.to_str();

    pt2.to_str();

    return 0;

}

　　
データメンバーがget、setメソッドを設定するかどうかについては、Google Cpp Style Guideを参照してください.

Access Control

link ▽
Make data members  private , and provide access to them through accessor functions as needed (for technical reasons, we allow data members of a test fixture class to be  protected  when using 
Google Test ). Typically a variable would be called  foo_  and the accessor function  foo() . You may also want a mutator function set_foo() . Exception:  static const  data members (typically called  kFoo ) need not be  private .
The definitions of accessors are usually inlined in the header file.
See also  Inheritance  and  Function Names .
http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml?showone=Access_Control#Access_Control