Matrix code in C++ Post: 302534011

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Top Forums Programming Matrix code in C++ Post 302534011 by kristinu on Sunday 26th of June 2011 12:52:17 PM

06-26-2011

Registered User

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]);
}

kristinu

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std::slice_array

std::slice_array< _Tp >(3cxx)											     std::slice_array< _Tp >(3cxx)

NAME

       std::slice_array< _Tp > -

SYNOPSIS

   Public Types
       typedef _Tp value_type

   Public Member Functions
       slice_array (const slice_array &)
       void operator%= (const valarray< _Tp > &) const
       template<class _Dom > void operator%= (const _Expr< _Dom, _Tp > &) const
       void operator&= (const valarray< _Tp > &) const
       template<class _Dom > void operator&= (const _Expr< _Dom, _Tp > &) const
       void operator*= (const valarray< _Tp > &) const
       template<class _Dom > void operator*= (const _Expr< _Dom, _Tp > &) const
       void operator+= (const valarray< _Tp > &) const
       template<class _Dom > void operator+= (const _Expr< _Dom, _Tp > &) const
       void operator-= (const valarray< _Tp > &) const
       template<class _Dom > void operator-= (const _Expr< _Dom, _Tp > &) const
       void operator/= (const valarray< _Tp > &) const
       template<class _Dom > void operator/= (const _Expr< _Dom, _Tp > &) const
       void operator<<= (const valarray< _Tp > &) const
       template<class _Dom > void operator<<= (const _Expr< _Dom, _Tp > &) const
       slice_array & operator= (const slice_array &)
       void operator= (const valarray< _Tp > &) const
       void operator= (const _Tp &) const
       template<class _Dom > void operator= (const _Expr< _Dom, _Tp > &) const
       void operator>>= (const valarray< _Tp > &) const
       template<class _Dom > void operator>>= (const _Expr< _Dom, _Tp > &) const
       void operator^= (const valarray< _Tp > &) const
       template<class _Dom > void operator^= (const _Expr< _Dom, _Tp > &) const
       void operator|= (const valarray< _Tp > &) const
       template<class _Dom > void operator|= (const _Expr< _Dom, _Tp > &) const

   Friends
       class valarray< _Tp >

Detailed Description
   template<typename _Tp>class std::slice_array< _Tp >
       Reference to one-dimensional subset of an array.

       A slice_array is a reference to the actual elements of an array specified by a slice. The way to get a slice_array is to call
       operator[](slice) on a valarray. The returned slice_array then permits carrying operations out on the referenced subset of elements in the
       original valarray. For example, operator+=(valarray) will add values to the subset of elements in the underlying valarray this slice_array
       refers to.

       Parameters:
	   Tp Element type.

       Definition at line 124 of file slice_array.h.

Author
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libstdc++							  Tue Nov 27 2012				     std::slice_array< _Tp >(3cxx)