Method ~IntMat

week13/examples/matclass.cpp:16–19

        data = new int[rows * cols]{};
    }
    ~IntMat()
    {
        delete [] data;
    }
    IntMat(const IntMat&) = delete;
    IntMat& operator=(const IntMat&) = delete;
    int getElement(size_t r, size_t c);