extend.hh

// Copyright (C) 2008, 2009, 2010 EPITA Research and Development
// Laboratory (LRDE)
//
// This file is part of Olena.
//
// Olena is free software: you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation, version 2 of the License.
//
// Olena 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 Olena.  If not, see <http://www.gnu.org/licenses/>.
//
// As a special exception, you may use this file as part of a free
// software project 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 MLN_CORE_ROUTINE_EXTEND_HH
# define MLN_CORE_ROUTINE_EXTEND_HH


# include <mln/core/image/dmorph/extension_ima.hh>
# include <mln/core/image/dmorph/extension_fun.hh>
# include <mln/core/image/dmorph/extension_val.hh>

# include <mln/trait/undef.hh>


# define mln_extension_type(I,J) \
  typename mln::internal::extension_type<I,J>::result;

# define mln_extension_type_(I,J) \
  mln::internal::extension_type<I,J>::result;


namespace mln
{

  namespace internal
  {

    template <typename I, typename J, typename B1, typename B2>
    struct extension_type_selector
    {
      typedef mln::trait::undef result;
    };


    template <typename I, typename J>
    struct extension_type_selector<I,J,
                                   metal::bool_<false>, metal::bool_<false> >
    : mlc_converts_to(J, mln_value(I))::check_t
    {
      typedef extension_val<I> result;
    };


    template <typename I, typename J>
    struct extension_type_selector<I,J,
                                   metal::bool_<false>, metal::bool_<true> >
    {
      typedef extension_fun<I, J> result;
    };


    template <typename I, typename J>
    struct extension_type_selector<I,J,
                                   metal::bool_<true>, metal::bool_<false> >
    {
      typedef extension_ima<I, J> result;
    };


    template <typename I, typename J>
    struct extension_type
      : extension_type_selector<I, J,
                                typename mlc_is_a(J,Image)::eval,
                                typename mlc_is_a(J,Function)::eval>
    {
    };


  } // end of namespace mln::internal



  template <typename I, typename F>
  extension_fun<const I, F>
  extend(const Image<I>& ima, const Function_v2v<F>& fun);

  template <typename I, typename F>
  extension_fun<I, F>
  extend(Image<I>& ima, const Function_v2v<F>& fun);



  template <typename I, typename J>
  extension_ima<const I, const J>
  extend(const Image<I>& ima, const Image<J>& ext);



  template <typename I>
  extension_val<const I>
  extend(const Image<I>& ima, const mln_value(I)& val);

  template <typename I>
  extension_val<I>
  extend(Image<I>& ima, const mln_value(I)& val);



# ifndef MLN_INCLUDE_ONLY


  // With a function.

  template <typename I, typename F>
  inline
  extension_fun<const I, F>
  extend(const Image<I>& ima, const Function_v2v<F>& fun)
  {
    mlc_converts_to(mln_result(F), mln_value(I))::check();
    extension_fun<const I, F> tmp(exact(ima), exact(fun));
    return tmp;
  }

  template <typename I, typename F>
  inline
  extension_fun<I, F>
  extend(Image<I>& ima, const Function_v2v<F>& fun)
  {
    mlc_converts_to(mln_result(F), mln_value(I))::check();
    extension_fun<I, F> tmp(exact(ima), exact(fun));
    return tmp;
  }


  // With an image.

  template <typename I, typename J>
  extension_ima<const I, const J>
  extend(const Image<I>& ima, const Image<J>& ext)
  {
    mlc_converts_to(mln_value(J), mln_value(I))::check();
    extension_ima<const I, const J> tmp(exact(ima), exact(ext));
    return tmp;
  }


  // With a value.

  template <typename I>
  inline
  extension_val<const I>
  extend(const Image<I>& ima, const mln_value(I)& val)
  {
    extension_val<const I> tmp(exact(ima), val);
    return tmp;
  }

  template <typename I>
  inline
  extension_val<I>
  extend(Image<I>& ima, const mln_value(I)& val)
  {
    extension_val<I> tmp(exact(ima), val);
    return tmp;
  }


# endif // ! MLN_INCLUDE_ONLY

} // end of namespace mln


#endif // ! MLN_CORE_ROUTINE_EXTEND_HH