compute.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_HISTO_COMPUTE_HH
# define MLN_HISTO_COMPUTE_HH


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


// Specializations are in:
# include <mln/histo/compute.spe.hh>


namespace mln
{

  namespace histo
  {

    template <typename I>
    array<mln_value(I)> compute(const Image<I>& input);


# ifndef MLN_INCLUDE_ONLY

    namespace impl
    {

      namespace generic
      {

        template <typename I>
        inline
        array<mln_value(I)> compute_(const I& input)
        {
          array<mln_value(I)> h;
          mln_piter(I) p(input.domain());
          for_all(p)
            ++h(input(p));
          return h;
        }

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

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


    template <typename I>
    inline
    array<mln_value(I)> compute(const Image<I>& input)
    {
      trace::entering("histo::compute");
      mlc_equal(mln_trait_image_quant(I), mln::trait::image::quant::low)::check();
      mln_precondition(exact(input).is_valid());

      array<mln_value(I)> h = impl::compute_(mln_trait_image_speed(I)(),
                                             exact(input));

      trace::exiting("histo::compute");
      return h;
    }

# endif // ! MLN_INCLUDE_ONLY

  } // end of namespace mln::histo

} // end of namespace mln


#endif // ! MLN_HISTO_COMPUTE_HH