min.hh

// Copyright (C) 2007, 2008, 2009 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_ARITH_MIN_HH
# define MLN_ARITH_MIN_HH


# include <mln/core/concept/image.hh>


// Specializations are in:
# include <mln/arith/min.spe.hh>

namespace mln
{

  namespace arith
  {


    template <typename L, typename R>
    mln_concrete(L)
    min(const Image<L>& lhs, const Image<R>& rhs);



    template <typename L, typename R>
    void min_inplace(Image<L>& lhs, const Image<R>& rhs);


# ifndef MLN_INCLUDE_ONLY

    namespace impl
    {

      namespace generic
      {
        template <typename L, typename R, typename O>
        inline
        void min_(const L& lhs, const R& rhs, O& output)
        {
          trace::entering("data::arith::generic::min_");

          mln_piter(L) p(lhs.domain());
          for_all(p)
            output(p) = lhs(p) < rhs(p) ? lhs(p) : rhs(p);

          trace::entering("data::arith::generic::min_");
        }

        template <typename L, typename R>
        inline
        void min_inplace_(L& lhs, const R& rhs)
        {
          trace::entering("data::arith::generic::min_inplace_");

          mln_piter(L) p(lhs.domain());
          for_all(p)
          if (rhs(p) < lhs(p))
            lhs(p) = rhs(p);

          trace::exiting("data::arith::generic::min_inplace_");
        }

      } // end of namespace mln::arith::impl::generic

    } // end of namespace mln::arith::impl


    // Facades.

    template <typename L, typename R>
    inline
    mln_concrete(L) min(const Image<L>& lhs, const Image<R>& rhs)
    {
      trace::entering("arith::min");
      mln_precondition(exact(rhs).domain() == exact(lhs).domain());

      mln_concrete(L) output;
      initialize(output, lhs);
      impl::min_(mln_trait_image_speed(L)(), exact(lhs),
                 mln_trait_image_speed(R)(), exact(rhs), output);

      trace::exiting("arith::min");
      return output;
    }

    template <typename L, typename R>
    inline
    void min_inplace(Image<L>& lhs, const Image<R>& rhs)
    {
      trace::entering("arith::min_inplace");

      mln_precondition(exact(rhs).domain() == exact(lhs).domain());
      impl::min_inplace_(mln_trait_image_speed(L)(), exact(lhs),
                         mln_trait_image_speed(R)(), exact(rhs));

      trace::exiting("arith::min_inplace");
    }

# endif // ! MLN_INCLUDE_ONLY

  } // end of namespace mln::arith

} // end of namespace mln


#endif // ! MLN_ARITH_MIN_HH