fwd_iter2d.hh

// Copyright (C) 2001, 2002, 2003, 2004  EPITA Research and Development Laboratory
//
// This file is part of the Olena Library.  This library is free
// software; you can redistribute it and/or modify it under the terms
// of the GNU General Public License version 2 as published by the
// Free Software Foundation.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this library; see the file COPYING.  If not, write to
// the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
// MA 02111-1307, USA.
//
// As a special exception, you may use this file as part of a free
// software library without restriction.  Specifically, if other files
// instantiate templates or use macros or inline functions from this
// file, or you compile this file and link it with other files to
// produce an executable, this file does not by itself cause the
// resulting executable to be covered by the GNU General Public
// License.  This exception does not however invalidate any other
// reasons why the executable file might be covered by the GNU General
// Public License.

#ifndef OLENA_CORE_FWD_ITER2D_HH
# define OLENA_CORE_FWD_ITER2D_HH

# include <oln/core/abstract/iter2d.hh>

namespace oln {

  template<class Exact = mlc::final>
  class fwd_iter2d; // fwd_decl

  template<class Exact>
  struct iter_traits< fwd_iter2d<Exact> >: public
  iter_traits<abstract::iter2d<typename
  mlc::exact_vt<fwd_iter2d<Exact>, Exact>::ret> >
  {
    typedef point2d point_type;
    typedef dpoint2d dpoint_type;
  };

  template<class Exact>
  class fwd_iter2d : public abstract::iter2d<typename mlc::exact_vt<fwd_iter2d<Exact>, Exact>::ret>
  {

  public:

    typedef typename mlc::exact_vt<fwd_iter2d<Exact>, Exact>::ret exact_type;

    typedef abstract::iter2d<exact_type> super_type; 
    typedef abstract::iter<exact_type> super_iter_type;

    enum { dim = iter_traits<exact_type>::dim }; 

    typedef typename iter_traits<exact_type>::point_type point_type;

    friend class abstract::iter<exact_type>;
    friend class abstract::iter2d<exact_type>;

    template<class Image>
    fwd_iter2d(const Image& ima) :
      super_type(ima.size())
    {}

    template<class U>
    U
    operator=(U u)
    {
      return super_iter_type::operator=(u);
    }

    static std::string
    name()
    {
      return "fwd_iter2d<" + Exact::name() + ">";
    }

  protected:

    void
    goto_begin_()
    {
      this->p_.row() = this->p_.col() = 0;
    }

    void
    goto_end_()
    {
      this->p_.row() = this->nrows_;
    }

    bool
    is_at_end_() const
    {
      return this->p_.row() == this->nrows_;
    }

    void
    goto_next_()
    {
      ++this->p_.col();
      if (this->p_.col() < this->ncols_)
        return;
      this->p_.col() = 0;
      ++this->p_.row();
    }

  };


} // end of oln


#endif // ! OLENA_CORE_FWD_ITER2D_HH

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