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