1 // ---------------------------------------------------------------------------- 2 // Copyright (C) 2009 Sebastian Redl 3 // 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) 7 // 8 // For more information, see www.boost.org 9 // ---------------------------------------------------------------------------- 10 11 #ifndef BOOST_PROPERTY_TREE_ID_TRANSLATOR_HPP_INCLUDED 12 #define BOOST_PROPERTY_TREE_ID_TRANSLATOR_HPP_INCLUDED 13 14 #include <boost/property_tree/ptree_fwd.hpp> 15 16 #include <boost/optional.hpp> 17 #include <string> 18 19 namespace boost { namespace property_tree 20 { 21 22 /// Simple implementation of the Translator concept. It does no translation. 23 template <typename T> 24 struct id_translator 25 { 26 typedef T internal_type; 27 typedef T external_type; 28 get_valueboost::property_tree::id_translator29 boost::optional<T> get_value(const T &v) { return v; } put_valueboost::property_tree::id_translator30 boost::optional<T> put_value(const T &v) { return v; } 31 }; 32 33 // This is the default translator whenever you get two equal types. 34 template <typename T> 35 struct translator_between<T, T> 36 { 37 typedef id_translator<T> type; 38 }; 39 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> > 45 { 46 typedef id_translator< std::basic_string<Ch, Traits, Alloc> > type; 47 }; 48 49 }} 50 51 #endif 52