constructors, copy constructors, assignment operators

For the relationship between such a class and class, we want to write a "deep copy" for it. The two classes are defined as follows:

class Point {    int  x;     int y;}; class  Public Shape {    *points;};

1. Constructors

// constructor Function　　Polygon (const point &p): _point (new point ) {  this->_point->x = p.x;  This->_point->y = p.y;}

2. Copy Constructors

// Copy Construction Polygon (const Polygon &p): _point (new point ) {    this->_ Point->x = p._point->x;     This->_point->y = p._point->y;}

3. Assignment constructors

// assignment operator void operator= (const Polygon &rhs) {    this->_point->x = rhs._point-> x;     This->_point->y = rhs._point->y;}

　　All Code & Test Cases

#include <iostream>using namespacestd;structShape {intNo//Shape Number};structPoint {intx; inty; Point (intXinty): x (x), Y (y) {} point ()=default;};structPolygon: PublicShape { point*_point; //constructor FunctionPolygon (ConstPoint &p): _point (NewPoint ) {         This->_point->x =p.x;  This->_point->y =p.y; }    //Copy ConstructionPolygon (ConstPolygon &p): _point (NewPoint ) {         This->_point->x = p._point->x;  This->_point->y = p._point->y; }    //assignment operator    void operator= (ConstPolygon &RHS) {         This->_point->x = rhs._point->x;  This->_point->y = rhs._point->y; }    ~Polygon () {Delete  This-_point; }};intMain () {Point X1 (1,2);    Polygon p1 (x1); Polygon P2=P1;    Polygon P3 (p2); P1=P2; return 0;}

View Code

　　In-memory variable address

P1. _ponit memory Address 0x002c0cb8

P2. _point memory Address 0x002c0cf0

P3. _point memory Address 0X002C0D28

(All memory addresses are not the same)

Success

constructors, copy constructors, assignment operators