error C2593: 'operator -' is ambiguous

頭文件：

class Coordinate

{

friend Coordinate &operator-(Coordinate &c);

public:?

Coordinate();

Coordinate(int x,int y);

Coordinate &operator-();

~Coordinate();

int getX();

void setX(int x);

int getY();

void setY(int y);

private:

int m_iX;

int m_iY;

?};

實現類：

#include "Coordinate.h"

#include <iostream>

using namespace std;

Coordinate::Coordinate(int x,int y){

m_iX = x;

m_iY = y;

cout<<"Coordinate() "<<m_iX<<","<<m_iY<<endl;

};

//Coordinate &Coordinate::operator-(){

// this->m_iX=-this->m_iX;

// this->m_iY=-this->m_iY;

// return *this;

// };

Coordinate &operator-(Coordinate &c){

c.m_iX = -c.m_iX;

c.m_iY = -c.m_iY;

return c;

};

Coordinate::Coordinate(){

cout<<"Coordinate() "<<endl;

};

Coordinate::~Coordinate(){

cout<<"~Coordinate() "<<m_iX<<","<<m_iY<<endl;

};

int Coordinate::getX(){

return m_iX;

};

int Coordinate::getY(){

return m_iY;

};

void Coordinate::setX(int x)

{

m_iX = x;

};

void Coordinate::setY(int y)

{

m_iY = y;

?};

測試：

#include "Coordinate.h"

#include <iostream>

using namespace std;

int main(void)

{

Coordinate coo(1,3);

cout<<coo.getX()<<","<<coo.getY()<<endl;

-coo;

cout<<coo.getX()<<","<<coo.getY()<<endl;

return 0;

}

結果：

慕前端8962423

2017-10-10

源自：C++遠征之模板篇 4-2

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1 回答

慕俠4449087
2017-10-10

/*頭文件中的成員函數的運算符重載要注釋掉，你同時定義了友元操作符重載和成員函數操作符重載，只需要保留一個*/
class?Coordinate
{
friend?Coordinate?&operator-(Coordinate?&c);
public:?
Coordinate();
Coordinate(int?x,int?y);
／＊Coordinate?&operator-();＊／
~Coordinate();
int?getX();
void?setX(int?x);
int?getY();
void?setY(int?y);
private:
int?m_iX;
int?m_iY;
?};