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diff --git a/ext/boost/mpl/copy_if.hpp b/ext/boost/mpl/copy_if.hpp
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+++ b/ext/boost/mpl/copy_if.hpp
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+
+#ifndef BOOST_MPL_COPY_IF_HPP_INCLUDED
+#define BOOST_MPL_COPY_IF_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2000-2004
+// Copyright David Abrahams 2003-2004
+//
+// 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)
+//
+// See http://www.boost.org/libs/mpl for documentation.
+
+// $Id: copy_if.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
+// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
+// $Revision: 49267 $
+
+#include <boost/mpl/fold.hpp>
+#include <boost/mpl/reverse_fold.hpp>
+#include <boost/mpl/apply.hpp>
+#include <boost/mpl/eval_if.hpp>
+#include <boost/mpl/identity.hpp>
+#include <boost/mpl/protect.hpp>
+#include <boost/mpl/aux_/inserter_algorithm.hpp>
+#include <boost/mpl/aux_/config/forwarding.hpp>
+
+namespace boost { namespace mpl {
+
+namespace aux {
+
+template<
+      typename Operation
+    , typename Predicate
+    >
+struct copy_if_op
+{
+    template< typename Sequence, typename T > struct apply
+#if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
+        : eval_if<
+              typename apply1<Predicate,T>::type
+            , apply2<Operation,Sequence,T>
+            , identity<Sequence>
+            >
+    {
+#else
+    {
+        typedef typename eval_if<
+              typename apply1<Predicate,T>::type
+            , apply2<Operation,Sequence,T>
+            , identity<Sequence>
+            >::type type;
+#endif
+    };
+};
+
+template<
+      typename Sequence
+    , typename Predicate
+    , typename Inserter
+    >
+struct copy_if_impl
+    : fold<
+          Sequence
+        , typename Inserter::state
+        , protect< aux::copy_if_op<
+              typename Inserter::operation
+            , Predicate
+            > >
+        >
+{
+};
+
+template<
+      typename Sequence
+    , typename Predicate
+    , typename Inserter
+    >
+struct reverse_copy_if_impl
+    : reverse_fold<
+          Sequence
+        , typename Inserter::state
+        , protect< aux::copy_if_op<
+              typename Inserter::operation
+            , Predicate
+            > >
+        >
+{
+};
+
+} // namespace aux
+
+BOOST_MPL_AUX_INSERTER_ALGORITHM_DEF(3, copy_if)
+
+}}
+
+#endif // BOOST_MPL_COPY_IF_HPP_INCLUDED