veeraiyan 0 Newbie Poster

hi i am new to eclipse
i wrote a small programm in c++ using operator overloading
if i compile normally no error but if compile through eclipse it is giving erorr message like
"operator not mached "
/*************************************************************/
this my main.cpp
************************************************************/

#include <iostream>
#include"use.h"
#include"friend.h"
using namespace std;
int main()
{
	
	cout<<"this is main"<<endl;
	return 0;
}
/******************************************************/
 friend.h
******************************************************/
#ifndef FRIEND_H_
#define FRIEND_H_
#include<vector>
using namespace std;
class FriendClass
{
friend vector < vector < float > > operator*(const vector < vector < float > > &m1,const vector < vector < float > > &m2);	

public:
	FriendClass();
	virtual~FriendClass();
	
private:
	
	
	
	
};

#endif /*FRIEND_H_*/
/***************************************************************************/
use.h
***************************************************************************/
#ifndef USE_H_
#define USE_H_
#include"friend.h"
class useClass
{
	friend vector < vector < float > > operator*(const vector < vector < float > > &,const vector < vector < float > > &);	//Addition

	
public:
	useClass();
	virtual~useClass();
	void usingFriend();
private:
	
	
};
#endif /*USE_H_*/
/***********************************************************************/

friend.cpp
************************************************************************/
#include "friend.h"
FriendClass::FriendClass()
{
	
}
FriendClass::~FriendClass()
{
	
}
 vector < vector < float > > operator*(const vector < vector < float > > &m1,const vector < vector < float > > &m2)
{
	int m,n,p,q;
		m=m1.capacity();n=m1.at(0).capacity();
		p=m2.capacity();q=m2.at(0).capacity(); 
				vector < vector<float> >m3(m,vector <float>(q,0));
	                 //(m*n) *(m*q)=(n*p)
		if(n==p)
		{
		//	vector < vector<float> >c(n,vector <float>(q,0));
			for(int i=0;i<m;i++)
			{
				for(int j=0;j<q;j++)
				{
					for(int k=0;k<n;k++)
					{
						m3[i][j]=m3[i][j]+m1[i][k]*m2[k][j];					 
					}	
				}
			
			}
			
			
			
		}
		else
		{
			//cout<<"Multiplication not possible\n"<<endl;

		}



		return m3;


}
/************************************************************************************/
use.cpp
********************************************************************************/
#include"use.h"
useClass::useClass()
{
	
}
useClass::~useClass()
{
	
}
void useClass::usingFriend()
{
	
	
	 	
		vector < vector < float > > Q(5, vector <float>(5,0));		// Q Matrix
		vector < vector < float > > V(3, vector <float>(1,0));		// Process Noise Matrix
		vector < vector < float > > Gamma(5, vector <float>(3,0));	// Gamma Matrix

			Q=Q*Gamma;//(~V);//gving Error during eclipse compile Fornormal compilation no error 

	
}
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