Added boost header

test/external/boost/property_tree/id_translator.hpp

@@ -0,0 +1,51 @@
+// ----------------------------------------------------------------------------
+// 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