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