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diff --git a/boost_ext/boost/bimap/relation/support/pair_by.hpp b/boost_ext/boost/bimap/relation/support/pair_by.hpp
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+++ b/boost_ext/boost/bimap/relation/support/pair_by.hpp
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+// Boost.Bimap
+//
+// Copyright (c) 2006-2007 Matias Capeletto
+//
+// 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)
+
+/// \file relation/support/pair_by.hpp
+/// \brief pair_by<member>(r) function
+
+#ifndef BOOST_BIMAP_RELATION_SUPPORT_PAIR_BY_HPP
+#define BOOST_BIMAP_RELATION_SUPPORT_PAIR_BY_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER>=1200)
+#pragma once
+#endif
+
+#include <boost/config.hpp>
+
+#include <boost/bimap/relation/support/pair_type_by.hpp>
+#include <boost/bimap/relation/detail/access_builder.hpp>
+
+#ifdef BOOST_BIMAP_ONLY_DOXYGEN_WILL_PROCESS_THE_FOLLOWING_LINES
+
+namespace boost {
+namespace bimaps {
+namespace relation {
+namespace support {
+
+/** \brief Gets a pair view of the relation.
+
+\ingroup relation_group
+                                                                        **/
+
+template< class Tag, class Relation >
+BOOST_DEDUCED_TYPENAME result_of::pair_by<Tag,Relation>::type
+    pair_by( Relation & rel );
+
+} // namespace support
+} // namespace relation
+} // namespace bimaps
+} // namespace boost
+
+#endif // BOOST_BIMAP_ONLY_DOXYGEN_WILL_PROCESS_THE_FOLLOWING_LINES
+
+
+#ifndef BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
+
+namespace boost {
+namespace bimaps {
+namespace relation {
+namespace support {
+
+
+// Since it is very error-prone to directly write the hole bunch
+// of relation accesor. They are buil from litle macro blocks that
+// are both more readable, leading to self docummenting code and a
+// lot more easier to understand and mantain.
+// It is very important to note that the three building blocks have
+// to laid in the same namespace in order to work. There is also
+// important to keep them in order.
+// The forward declaration are not necesary but they help a lot to
+// the reader, as they undercover what is the signature of the
+// result code.
+// In the end, it is not quicker to do it in this way because you
+// write a lot. But this code has no complexity at all and almost
+// every word writed is for documentation.
+
+// Result of
+// -------------------------------------------------------------------------
+/*
+    namespace result_of {
+
+    template< class Tag, class Relation >
+    struct pair_by<Tag,Relation>;
+    {
+        typedef -unspecified- type;
+    };
+
+    } // namespace result_of
+*/
+
+BOOST_BIMAP_SYMMETRIC_ACCESS_RESULT_OF_BUILDER
+(
+    pair_by,
+    pair_type_by
+)
+
+
+
+// Implementation
+// -------------------------------------------------------------------------
+
+BOOST_BIMAP_SYMMETRIC_ACCESS_IMPLEMENTATION_BUILDER
+(
+    pair_by,
+    Relation,
+    rel,
+    return rel.get_left_pair(),
+    return rel.get_right_pair()
+)
+
+// Interface
+// --------------------------------------------------------------------------
+
+BOOST_BIMAP_SYMMETRIC_ACCESS_INTERFACE_BUILDER
+(
+    pair_by
+)
+
+} // namespace support
+} // namespace relation
+} // namespace bimaps
+} // namespace boost
+
+
+#endif // BOOST_BIMAP_DOXIGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES
+
+#endif // BOOST_BIMAP_RELATION_SUPPORT_PAIR_BY_HPP