ch_function_value.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_FUN_V2V_CH_FUNCTION_VALUE_HH
# define MLN_FUN_V2V_CH_FUNCTION_VALUE_HH


# include <mln/core/concept/function.hh>
# include <mln/fun/internal/ch_function_value_impl.hh>



namespace mln
{

  // Forward declaration.
  namespace convert { template <typename T, typename O> T to(const O& from); }

  namespace fun
  {

    namespace v2v
    {

      template <typename F, typename V>
      class ch_function_value : public Function_v2v< ch_function_value<F,V> >,
                                public internal::ch_function_value_impl<F, V>
      {
      public:
        typedef F function;
        typedef V result;
        typedef V rvalue;
        typedef V lvalue;

        ch_function_value();
        ch_function_value(const F& f);

        template <typename W>
        V operator()(const W& w) const;

      private:
        F f_;
      };


# ifndef MLN_INCLUDE_ONLY

      template <typename F, typename V>
      inline
      ch_function_value<F,V>::ch_function_value()
      {
      }

      template <typename F, typename V>
      inline
      ch_function_value<F,V>::ch_function_value(const F& f)
      {
        f_ = f;
      }

      template <typename F, typename V>
      template <typename W>
      inline
      V
      ch_function_value<F,V>::operator()(const W& w) const
      {
        return mln::convert::to<V>(f_(w));
      }

# endif // ! MLN_INCLUDE_ONLY

    } // end of namespace mln::fun::v2v

  } // end of namespace mln::fun

} // end of namespace mln


#endif // ! MLN_FUN_V2V_CH_FUNCTION_VALUE_HH

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