Operator overloading problem

[Aïcha & Didier Rizzotti <rizzotti at freesurf dot ch>]

Hello,

I've written a small vector2 class with some operator overloading:

--------------------------------------------------------------

#include "vector2.h"

vector2::vector2(int dimension) : vector(dimension)	//Constructeur
{
}

vector2::vector2(vector2 &v) : vector(v.dim)	//Constructeur de recopie
{
	int i;

	for(i=0;i<dim;i++)
		put(v.get(i),i);
}

void vector2::operator =(vector2 &v)//assignation
{//vecteur de mêmes taille uniquement
	int i;

	for(i=0;i<dim;i++)
		put(v.get(i),i);
}

vector2 vector2::operator +(vector2 &v)
{
	vector2 tmp(dim);

	tmp.add(*this);
	tmp.add(v);
	
	return tmp;
}

vector2 vector2::operator -(vector2 &v)
{
	vector2 tmp(dim);

	tmp.add(*this);
	tmp.sub(v);
	
	return tmp;
}

float vector2::operator *(vector2 &v)
{
	return prod(v);
}

---------------------------------------------------------------

And I use it in a small sample programm:

---------------------------------------------------------------

#include <iostream>
#include "vector2.h"
using namespace std;

#define DIM 4

int main()
{
	vector2 v1(DIM);//instanciation de 3 vecteurs
	vector2 v2(DIM);
	vector2 v3(DIM);
	int i;
	float k=0.0;
	
	for (i=0;i<DIM;i++)//remplissage des vecteurs
		{
			v1.put(k,i);
			v2.put(k+1,i);
			k += 1;
		}

	cout<<"Vecteur v1: ";
	for (i=0;i<DIM;i++)//affichage des vecteurs
	{
		cout<<v1.get(i)<<" ";
	}
	cout<<"\nVecteur v2: ";
	for (i=0;i<DIM;i++)
	{
		cout<<v2.get(i)<<" ";
	}
	cout<<"\n";

	v3 = v1 + v2); //<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< BUG
	//v3.operator = (v1 + v2);

	cout<<"\nAprès addition: ";//affichage du résultat
	for (i=0;i<DIM;i++)
	{
		cout<<v3.get(i)<<" ";
	}
	cout<<"\n";

	cout<<"Produit scalaire: "<< v1 * v2 <<"\n\n";

	return 0;
 }

---------------------------------------------------------------

The programm work well with Visual C++ 6.0, but return the following
error with g++:

D:\Perso\Didier_perso\Job\EPFL\ex\matrice_vect>g++ ex_vector2.cpp
vector2.cpp ve
ctor.cpp matrix.cpp
ex_vector2.cpp: In function `int main()':
ex_vector2.cpp:45: no matching function for call to
`vector2::operator=(vector2
   )'
vector2.h:17: candidates are: void vector2::operator=(vector2&)


I can not see where is the problem (maybe temporary object).
Can-you help me ?

Didier Rizzotti

--------------------------------------------------------------
Didier Rizzotti
Suchet 1
1070 Puidoux (Switzerland)
tél:+41.79.476.21.37
mailto:rizzotti@freesurf.ch