struct 重载和继承的使用例子

最新推荐文章于 2025-07-08 11:00:27 发布

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最新推荐文章于 2025-07-08 11:00:27 发布

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分类专栏： C++

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本文提供了一个C++示例程序，展示了如何在结构体中实现运算符重载以及通过派生类继承基类的方式扩展结构体的功能。通过对点（CPoint）和矩形（CRect/CRect2）的定义与操作，具体说明了加法、乘法等运算符的重载方法及矩形类的继承关系。

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struct 重载和继承的使用例子

#include "StdAfx.h"
#include <iostream>
#include <vector>
using namespace std;

typedef struct _CPoint    
{    
	int x;
	int y;

	_CPoint ();
	_CPoint (int a,int b);
	_CPoint operator + (_CPoint point);
	_CPoint operator * (_CPoint point);
	_CPoint operator * (int point);
	friend _CPoint operator - (_CPoint point1, _CPoint point2);
	friend _CPoint operator * (int sum, _CPoint point);
	friend bool operator > (_CPoint point1, _CPoint point2);
	friend bool operator == (_CPoint point1, _CPoint point2);

}CPoint; 


typedef struct _CRect    
{    
	CPoint p1;
	CPoint p2;

	_CRect();
	~_CRect();

	_CRect(CPoint p1, CPoint p2);
}CRect; 

typedef struct _CRect2 : _CRect
{
	int width;
	int height;
	int num;

	_CRect2();
	~_CRect2();
	_CRect2(CPoint p1, CPoint p2,int num);
	void showMessage();
}CRect2;




bool operator == (_CPoint point1, _CPoint point2)
{
	if ((point2.x == point1.x) && (point2.y == point1.y))
	{
		return true;
	}

	return false;
}

bool operator > (_CPoint point1, _CPoint point2)
{
	if (point1.x > point2.x)
	{
		return true;
	}

	if ((point1.x == point2.x) && (point1.y > point2.y))
	{
		return true;
	}

	return false;
}

_CPoint operator * (int num, _CPoint point)
{
	_CPoint sum;
	sum.x = num * point.x;
	sum.y = num * point.y;

	return sum;
}

_CPoint operator - (_CPoint point1, _CPoint point2)
{
	_CPoint sum;
	sum.x = point1.x - point2.x;
	sum.y = point1.y - point2.y;

	return sum;
}


_CPoint :: _CPoint()
{

}

_CPoint :: _CPoint(int a,int b)
{
	this->x=a;
	this->y=b;
}

_CPoint _CPoint :: operator + (_CPoint point)
{
	_CPoint sum;
	sum.x = this->x + point.x;
	sum.y = this->y + point.y;

	return sum;
}

_CPoint _CPoint :: operator * (_CPoint point)
{
	_CPoint sum;
	sum.x = this->x * point.x;
	sum.y = this->y * point.y;

	return sum;
}

_CPoint _CPoint :: operator * (int num)
{
	_CPoint sum;
	sum.x = this->x * num;
	sum.y = this->y * num;

	return sum;
}




_CRect :: _CRect()
{
	printf("\n _CRect()");
}

_CRect :: ~_CRect()
{
	printf("\n ~_CRect()");
}

_CRect :: _CRect(CPoint p1, CPoint p2)
{
	printf("\n _CRect(CPoint p1, CPoint p2)");
	this->p1 = p1;
	this->p2 = p2;
}

_CRect2 :: _CRect2()
{
	printf("\n _CRect2()");
}

_CRect2 :: ~_CRect2()
{
	printf("\n ~_CRect2()");
	this->width = 0;
	this->height = 0;
}

_CRect2 :: _CRect2(CPoint p1, CPoint p2, int num) : _CRect( p1, p2)
{
	printf("\n _CRect2(CPoint p1, CPoint p2)");
	this->num = num;
	this->width = fabsf(this->p1.x - this->p2.x);
	this->height = fabsf(this->p1.y - this->p2.y);
}

void _CRect2 :: showMessage()
{
	printf("\n *****************************");
	printf("\n -- num  ---- %d", this->num);
	printf("\n -- width  -- %d", this->width);
	printf("\n -- height -- %d", this->height);
	printf("\n -- p1 ------ (%d, %d)", this->p1.x, this->p1.y);
	printf("\n -- p2 ------ (%d, %d)", this->p2.x, this->p2.y);
	printf("\n *****************************");
}

void xigou(CRect2 rect)
{
	//CRect2 rect;
	rect.showMessage();
}
void main(void)
{
	CPoint p1(2,6);
	CPoint p2(1,4);
	CPoint p3;

	p3 = p1 + p2;
	p3 = p1 * p2;
	p3 = p3 * 2;
	p3 = p2 - p1;
	p3 = p3 * 4;

	bool result = false;
	result = p1 > p2;

	//CRect rect = CRect(p1,p2);
	CRect2 rect;
	xigou(rect);

	CRect2 rect2 = CRect2(p1,p2,6);
	rect2.showMessage();

	return;
}