from_unsigned_to_value.hh

// Copyright (C) 2009, 2010, 2011 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_CONVERT_IMPL_FROM_UNSIGNED_TO_VALUE_HH
# define MLN_CONVERT_IMPL_FROM_UNSIGNED_TO_VALUE_HH


# include <utility>
# include <mln/value/concept/integer.hh>
# include <mln/core/concept/value.hh>
# include <mln/value/label.hh>
# include <mln/math/round.hh>




namespace mln
{

  namespace convert
  {

    template <typename V>
    void
    from_to(const unsigned& from, Value<V>& to);

    inline
    void
    from_to_(const unsigned& from, bool& to);

# ifndef MLN_INCLUDE_ONLY

      namespace impl
      {

        // Case 1:

        template <typename V>
        inline
        void
        from_unsigned_to_value(const unsigned&            from,
                               mln::value::Integer<V>&    to)
        {
          exact(to) = from;
        }

        template <unsigned n>
        inline
        void
        from_unsigned_to_value(const unsigned&            from,
                               mln::value::label<n>&      to)
        {
          exact(to) = from;
        }

        // Default: no conversion defined.

        template <typename V>
        inline
        void
        from_unsigned_to_value(const unsigned&,
                               Value<V>&)
        {
          mlc_abort(V)::check();
        }

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


      namespace internal
      {

        template <typename V>
        inline
        void
        from_unsigned_to_value_dispatch(const unsigned& from, Value<V>& to)
        {
          impl::from_unsigned_to_value(from, exact(to));
        }

      } // end of namespace mln::convert::unsignedernal


      namespace over_load
      {

        // Facades.
        // unsigned-> Value
        template <typename V>
        void
        from_to_(const unsigned& from, Value<V>& to)
        {
          internal::from_unsigned_to_value_dispatch(from, to);
        }


        // Facades.
        // unsigned-> bool
        inline
        void
        from_to_(const unsigned& from, bool& to)
        {
          to = (from != 0u);
        }


      } // end of namespace mln::convert::over_load


# endif // ! MLN_INCLUDE_ONLY

  } // end of namespace mln::convert

} // end of namespace mln


#endif // ! MLN_CONVERT_IMPL_FROM_UNSIGNED_TO_VALUE_HH