Members inaccessible with friend function

Question

I am getting an error that I cannot explain. Here is my header file:

#include <iostream>
using namespace std;
namespace project
{
#ifndef MATRIX_H
#define MATRIX_H

typedef int* IntArrayPtr;
class Matrix
{
public:
    friend ostream& operator<<(ostream& out, const Matrix& object);
    friend istream& operator>>(istream& in, Matrix& theArray);
    //Default Constructor
    Matrix();

    Matrix(int max_number_rows, int max_number_cols, int intial_value);

    //Destructor
    ~Matrix();
    //Copy Constructor
    Matrix(const Matrix& right_side);
    //Assignment Operator
    Matrix& operator=(const Matrix& right_side);

    void Clear();
    int Rows();
    int Columns();
    bool GetCell(int x,int y, int& val);
    bool SetCell(int x,int y, int val);
    //void Debug(ostream& out);
private:
    int initialVal;
    int rows;
    int cols;
    IntArrayPtr *m;
};
#endif
}

And here my definition:

ostream& operator<<(ostream& out, const Matrix& object)
{
    for(int r = 0; r < object.rows; r++)
    {
        for(int c = 0; c < object.cols; c++)
        {
            out << object.m[r][c] << " ";
        }
        out << endl;
    }
    return out;
}

It's giving me the error that Matrix.h members are inaccessible, but I clearly stated that they are friend function.

Answer 1

Where are those function definitions located? The friend declaration injects the names into namespace project. If the functions aren't defined in that namespace, they're different functions and not friends.