十、C++运算符重载

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做C++题的时候都不可避免的会遇到运算符重载的题：

举个例子：

在Rectangle.h中#ifndef RECTANGLE_H#define RECTANGLE_Hclass Rectangle{    int left,top,right,bottom;    public:        Rectangle(int l=0,int t=0,int r=0,int b=0);        void Assign(int l,int t,int r,int b);        void SetLeft(int t){left=t;}        void SetRight(int t){right=t;}        void SetTop(int t){top=t;}        void SetBottom(int t){bottom=t;}        void Show();        void operator +=(Rectangle &);        void operator -=(Rectangle &);        friend Rectangle operator +(Rectangle &,Rectangle &);        friend Rectangle operator -(Rectangle &,Rectangle &);        virtual ~Rectangle();    protected:    private:};#endif // RECTANGLE_H

在Rectangle.cpp中#include "Rectangle.h"#include <iostream>using namespace std;Rectangle::Rectangle(int l,int t,int r,int b){    left=l;right=r;top=t;bottom=b;}void Rectangle::Assign(int l,int t,int r,int b){    left=l;right=r;top=t;bottom=b;}void Rectangle::Show(){    cout<<"left-top point is("<<left<<","<<top<<")"<<endl;    cout<<"right-bottom point is("<<right<<","<<bottom<<")"<<endl;}void Rectangle::operator+=(Rectangle &rect){    int x=rect.right-rect.left;    int y=rect.bottom-rect.top;    right+=x;    bottom+=y;}void Rectangle::operator-=(Rectangle &rect){    int x=rect.right-rect.left;    int y=rect.bottom-rect.top;    right-=x;    bottom-=y;}Rectangle operator -(Rectangle &rect1,Rectangle &rect2){rect1-=rect2;return rect1;}Rectangle operator +(Rectangle &rect1,Rectangle &rect2){rect1+=rect2;return rect1;}Rectangle::~Rectangle(){    //dtor}

在main中#include <iostream>#include "Rectangle.h"using namespace std;int main(){    Rectangle rect;     cout<<"rect初始"<<endl;    rect.Show();    rect.Assign(100,200,300,400);     cout<<"rect Assign"<<endl;    rect.Show();    Rectangle rect1(0,0,200,200);     cout<<"rect1 Assign"<<endl;    rect1.Show();    rect+=rect1;    cout<<"与rect1相加"<<endl;    rect.Show();    Rectangle rect2;    rect2=rect1+rect;    cout<<"rect2(+)"<<endl;    rect.Show();    rect2=rect-rect1;    cout<<"rect2(-)"<<endl;    rect.Show();    return 0;}

这样就解决了Rectangle的特殊定义的加减操作

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