compute.hh

// Copyright (C) 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_SET_COMPUTE_HH
# define MLN_SET_COMPUTE_HH


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


namespace mln
{

  namespace set
  {

    //
    template <typename A, typename S>
    mln_result(A)
    compute(const Accumulator<A>& a, const Site_Set<S>& s);


    // \return The accumulator result.
    //
    template <typename A, typename S>
    mln_meta_accu_result(A, mln_site(S))
    compute(const Meta_Accumulator<A>& a, const Site_Set<S>& s);



# ifndef MLN_INCLUDE_ONLY


    // Implementation.


    namespace impl
    {

      namespace generic
      {

        template <typename A, typename S>
        inline
        mln_result(A)
        compute(const Accumulator<A>& a_, const Site_Set<S>& s_)
        {
          trace::entering("set::impl::generic::compute");

          mlc_converts_to(mln_site(S), mln_argument(A))::check();

          A a = exact(a_);
          const S& s = exact(s_);

          a.init();
          mln_piter(S) p(s);
          for_all(p)
            a.take(p);

          trace::exiting("set::impl::generic::compute");
          return a.to_result();
        }

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

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



    // Facades.


    template <typename A, typename S>
    inline
    mln_result(A)
    compute(const Accumulator<A>& a, const Site_Set<S>& s)
    {
      trace::entering("set::compute");

      mlc_converts_to(mln_site(S), mln_argument(A))::check();

      mln_result(A) r = impl::generic::compute(a, s);

      trace::exiting("set::compute");
      return r;
    }


    template <typename A, typename S>
    mln_meta_accu_result(A, mln_site(S))
    compute(const Meta_Accumulator<A>& a, const Site_Set<S>& s)
    {
      trace::entering("set::compute");

      typedef mln_accu_with(A, mln_site(S)) A_;
      A_ a_ = accu::unmeta(exact(a), mln_site(S)());

      mln_result(A_) r = impl::generic::compute(a_, s);

      trace::exiting("set::compute");
      return r;
    }

# endif // ! MLN_INCLUDE_ONLY

  } // end of namespace mln::set

} // end of namespace mln


#endif // ! MLN_SET_COMPUTE_HH