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diff --git a/src/third_party/boost-1.69.0/boost/range/algorithm/copy_backward.hpp b/src/third_party/boost-1.69.0/boost/range/algorithm/copy_backward.hpp
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+//  Copyright Neil Groves 2009. Use, modification and
+//  distribution is subject to 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 http://www.boost.org/libs/range/
+//
+#ifndef BOOST_RANGE_ALGORITHM_COPY_BACKWARD_HPP_INCLUDED
+#define BOOST_RANGE_ALGORITHM_COPY_BACKWARD_HPP_INCLUDED
+
+#include <boost/concept_check.hpp>
+#include <boost/range/begin.hpp>
+#include <boost/range/end.hpp>
+#include <boost/range/concepts.hpp>
+#include <algorithm>
+
+namespace boost
+{
+    namespace range
+    {
+
+/// \brief template function copy_backward
+///
+/// range-based version of the copy_backwards std algorithm
+///
+/// \pre BidirectionalRange is a model of the BidirectionalRangeConcept
+/// \pre BidirectionalTraversalWriteableIterator is a model of the BidirectionalIteratorConcept
+/// \pre BidirectionalTraversalWriteableIterator is a model of the WriteableIteratorConcept
+template< class BidirectionalRange, class BidirectionalTraversalWriteableIterator >
+inline BidirectionalTraversalWriteableIterator
+copy_backward(const BidirectionalRange& rng,
+              BidirectionalTraversalWriteableIterator out)
+{
+    BOOST_RANGE_CONCEPT_ASSERT(( BidirectionalRangeConcept<const BidirectionalRange> ));
+    return std::copy_backward(boost::begin(rng), boost::end(rng), out);
+}
+
+    } // namespace range
+    using range::copy_backward;
+} // namespace boost
+
+#endif // include guard