index_of_value.hh

// Copyright (C) 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_FUN_V2I_INDEX_OF_VALUE_HH
# define MLN_FUN_V2I_INDEX_OF_VALUE_HH


# include <mln/core/concept/function.hh>
# include <mln/trait/value_.hh>


namespace mln
{

  namespace fun
  {

    namespace v2i
    {

      template <typename T>
      struct index_of_value : Function_v2v< index_of_value<T> >,
                              private metal::bool_<(mln_dim(T) == 1)>::check_t
      {
        typedef unsigned result;
        unsigned operator()(const T& v) const;
      };

      template <>
      struct index_of_value<bool> : Function_v2v< index_of_value<bool> >
      {
        typedef unsigned result;
        unsigned operator()(bool b) const;
      };

      template <typename T>
      unsigned
      meta_index_of_value(const T& v);


# ifndef MLN_INCLUDE_ONLY

      template <typename T>
      inline
      unsigned
      index_of_value<T>::operator()(const T& v) const
      {
        return unsigned( int(v) - int(mln_min(T)) );
      }

      inline
      unsigned index_of_value<bool>::operator()(bool b) const
      {
        return b ? 1u : 0u;
      }

      template <typename T>
      inline
      unsigned
      meta_index_of_value(const T& v)
      {
        index_of_value<T> f;
        return f(v);
      }

# endif // ! MLN_INCLUDE_ONLY

    } // end of namespace mln::fun::v2i

  } // end of namespace mln::fun

} // end of namespace mln

#endif // ! MLN_FUN_V2I_INDEX_OF_VALUE_HH