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Matrix code in C++

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Old 06-26-2011
Matrix code in C++
I have the code below in C++ and am trying to understand what these do and how to call them.

Code:
template <class Type>
class Matrix {

public:

  Matrix();

  Matrix(
    const int  m,
    const int  n );

  Matrix(
    const Matrix&  A );

  ~Matrix();

  Vector<Type>&
  operator [] (
    const int  i );

  Vector<Type>&
  operator [] (
    const int  i ) const;

  Vector<Type>&
  operator () (
    const int  i );

  Vector<Type>&
  operator () (
    const int  i ) const;

protected:

  typedef Vector<Type>*  VP;
  int  M;
  int  N;
  VP*  Mat;

};

template <class Type>
inline
Vector<Type>&
Matrix<Type>::operator [] (
  const int  i ) {

  assert((i < M) && (i >= 0));
  return (*Mat[i]);

}

template <class Type>
inline
Vector<Type>&
Matrix<Type>::operator [] (
  const int  i ) const {

  assert((i < M) && (i >= 0));
  return (*Mat[i]);

}

template <class Type>
inline
Vector<Type>&
Matrix<Type>::operator () (
  const int  i ) {

  if (i >= M) {
      do {
          i -= M;
      } while (i >= M);

  } else if (i < 0) {
      do {
          i += M;
      } while (i < 0);
  }
  return (*Mat[i]);

}

template <class Type>
inline
Vector<Type>&
Matrix<Type>::operator () (
  const int  i ) const {

    if (i >= M) {
        do {
            i -= M;
        } while (i >= M);

    } else if (i < 0) {
        do {
            i += M;
        } while (i < 0);
    }
    return (*Mat[i]);
}

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