1 // ----------------------------------------------------------------------------
2 // Copyright (C) 2009 Sebastian Redl
4 // Distributed under the Boost Software License, Version 1.0.
5 // (See accompanying file LICENSE_1_0.txt or copy at
6 // http://www.boost.org/LICENSE_1_0.txt)
8 // For more information, see www.boost.org
9 // ----------------------------------------------------------------------------
11 #ifndef BOOST_PROPERTY_TREE_ID_TRANSLATOR_HPP_INCLUDED
12 #define BOOST_PROPERTY_TREE_ID_TRANSLATOR_HPP_INCLUDED
14 #include <boost/property_tree/ptree_fwd.hpp>
16 #include <boost/optional.hpp>
19 namespace boost { namespace property_tree
22 /// Simple implementation of the Translator concept. It does no translation.
26 typedef T internal_type;
27 typedef T external_type;
29 boost::optional<T> get_value(const T &v) { return v; }
30 boost::optional<T> put_value(const T &v) { return v; }
33 // This is the default translator whenever you get two equal types.
35 struct translator_between<T, T>
37 typedef id_translator<T> type;
40 // A more specific specialization for std::basic_string. Otherwise,
41 // stream_translator's specialization wins.
42 template <typename Ch, typename Traits, typename Alloc>
43 struct translator_between< std::basic_string<Ch, Traits, Alloc>,
44 std::basic_string<Ch, Traits, Alloc> >
46 typedef id_translator< std::basic_string<Ch, Traits, Alloc> > type;