Copy Control 复制控制 (复制构造函数 copy constructor，析构函数 destructor, 赋值操作符 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中国"<<endl;

    Point pt2(pt);

    pt2.setX(11);

    pt2.setY(22);

    pt2.setData(112233);



    pt.to_str();

    pt2.to_str();

    return 0;

}

　　

关于数据成员是否设置get,set方法，参考 Google Cpp Style Guide

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