Chris@16: // ----------------------------------------------------------------------------
Chris@16: // Copyright (C) 2009 Sebastian Redl
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. 
Chris@16: // (See accompanying file LICENSE_1_0.txt or copy at 
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: // For more information, see www.boost.org
Chris@16: // ----------------------------------------------------------------------------
Chris@16: 
Chris@16: #ifndef BOOST_PROPERTY_TREE_ID_TRANSLATOR_HPP_INCLUDED
Chris@16: #define BOOST_PROPERTY_TREE_ID_TRANSLATOR_HPP_INCLUDED
Chris@16: 
Chris@16: #include <boost/property_tree/ptree_fwd.hpp>
Chris@16: 
Chris@16: #include <boost/optional.hpp>
Chris@16: #include <string>
Chris@16: 
Chris@16: namespace boost { namespace property_tree
Chris@16: {
Chris@16: 
Chris@16:     /// Simple implementation of the Translator concept. It does no translation.
Chris@16:     template <typename T>
Chris@16:     struct id_translator
Chris@16:     {
Chris@16:         typedef T internal_type;
Chris@16:         typedef T external_type;
Chris@16: 
Chris@16:         boost::optional<T> get_value(const T &v) { return v; }
Chris@16:         boost::optional<T> put_value(const T &v) { return v; }
Chris@16:     };
Chris@16: 
Chris@16:     // This is the default translator whenever you get two equal types.
Chris@16:     template <typename T>
Chris@16:     struct translator_between<T, T>
Chris@16:     {
Chris@16:         typedef id_translator<T> type;
Chris@16:     };
Chris@16: 
Chris@16:     // A more specific specialization for std::basic_string. Otherwise,
Chris@16:     // stream_translator's specialization wins.
Chris@16:     template <typename Ch, typename Traits, typename Alloc>
Chris@16:     struct translator_between< std::basic_string<Ch, Traits, Alloc>,
Chris@16:                                std::basic_string<Ch, Traits, Alloc> >
Chris@16:     {
Chris@16:         typedef id_translator< std::basic_string<Ch, Traits, Alloc> > type;
Chris@16:     };
Chris@16: 
Chris@16: }}
Chris@16: 
Chris@16: #endif