// Copyright (c) 1998-2003  ETH Zurich (Switzerland).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org); you may redistribute it under
// the terms of the Q Public License version 1.0.
// See the file LICENSE.QPL distributed with CGAL.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $Source: /CVSROOT/CGAL/Packages/Matrix_search/include/CGAL/Cartesian_matrix.h,v $
// $Revision: 1.58 $ $Date: 2003/09/29 08:41:43 $
// $Name:  $
//
// Author(s)     : Michael Hoffmann <hoffmann@inf.ethz.ch>

#if ! (CGAL_CARTESIAN_MATRIX_H)
#define CGAL_CARTESIAN_MATRIX_H 1

#include <CGAL/basic.h>
#include <CGAL/Optimisation/assertions.h>

CGAL_BEGIN_NAMESPACE

template < class Operation,
           class RandomAccessIC_row,
           class RandomAccessIC_column >
class Cartesian_matrix {
public:
  typedef typename Operation::result_type           Value;

  Cartesian_matrix(RandomAccessIC_row r_f,
                   RandomAccessIC_row r_l,
                   RandomAccessIC_column c_f,
                   RandomAccessIC_column c_l)
  : row_vec(r_f),
    column_vec(c_f),
    n_rows(r_l - r_f),
    n_columns(c_l - c_f)
  {}

  Cartesian_matrix(RandomAccessIC_row r_f,
                   RandomAccessIC_row r_l,
                   RandomAccessIC_column c_f,
                   RandomAccessIC_column c_l,
                   const Operation& o)
  : row_vec(r_f),
    column_vec(c_f),
    n_rows(r_l - r_f),
    n_columns(c_l - c_f),
    op(o)
  {}

  int
  number_of_rows() const
  { return n_rows; }

  int
  number_of_columns() const
  { return n_columns; }

  Value
  operator()(int r, int c) const
  {
    CGAL_optimisation_precondition(r >= 0 && r < number_of_rows());
    CGAL_optimisation_precondition(c >= 0 && c < number_of_columns());
    return op(row_vec[r], column_vec[c]);
  }

protected:
  RandomAccessIC_row     row_vec;
  RandomAccessIC_column  column_vec;
  int                    n_rows;
  int                    n_columns;
  Operation              op;
}; // class Cartesian_matrix< ... >

template < class Operation,
           class RandomAccessIC_row,
           class RandomAccessIC_column >
inline
Cartesian_matrix< Operation,
                       RandomAccessIC_row,
                       RandomAccessIC_column >
cartesian_matrix( RandomAccessIC_row r_f,
                       RandomAccessIC_row r_l,
                       RandomAccessIC_column c_f,
                       RandomAccessIC_column c_l,
                       const Operation& o)
{
  return
  Cartesian_matrix< Operation,
                         RandomAccessIC_row,
                         RandomAccessIC_column >
  ( r_f, r_l, c_f, c_l, o);
}

CGAL_END_NAMESPACE

#endif // ! (CGAL_CARTESIAN_MATRIX_H)
// ----------------------------------------------------------------------------
// ** EOF
// ----------------------------------------------------------------------------

