Macierz. Matrix

/*
Autor: Dawid Mocek


*/
#include <string>
#include <iostream>

using namespace std;

class Macierz
{
    int **matrix;
    int x;
    int y;

public:
    Macierz();
    Macierz(int x, int y);
    ~Macierz();
    friend ostream & operator<<(ostream &out, const Macierz& ma);
    Macierz& operator= (const Macierz&);

};

Macierz::Macierz() :x(0), y(0), matrix(nullptr)
{

}

Macierz::Macierz(int x, int y) : x(x), y(y)
{
    matrix = new int*[x];
    for (int c=0; c < x; c++)
        matrix[c] = new int[y];

}

Macierz::~Macierz()
{
    if (matrix == nullptr) return;

    for (int c=0; c < x; c++)
        delete[] matrix[c];
    delete[] matrix;

    matrix = nullptr;
}
ostream & operator<<(ostream &out, const Macierz& ma)
{

    for (int i = 0; i < ma.x; i++)
    for (int j = 0; j < ma.y; j++)
        out << ma.matrix[i][j] << " ";

    return out;
}
Macierz& Macierz::operator= (const Macierz& org)
{
    // ten sam adres pamieci
    matrix = org.matrix;
    x = org.x;
    y = org.y;

    return *this;
}