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diff --git a/src/third_party/boost-1.69.0/boost/range/algorithm/merge.hpp b/src/third_party/boost-1.69.0/boost/range/algorithm/merge.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_MERGE_HPP_INCLUDED
+#define BOOST_RANGE_ALGORITHM_MERGE_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 merge
+///
+/// range-based version of the merge std algorithm
+///
+/// \pre SinglePassRange1 is a model of the SinglePassRangeConcept
+/// \pre SinglePassRange2 is a model of the SinglePassRangeConcept
+/// \pre BinaryPredicate is a model of the BinaryPredicateConcept
+///
+template<class SinglePassRange1, class SinglePassRange2,
+         class OutputIterator>
+inline OutputIterator merge(const SinglePassRange1& rng1,
+                            const SinglePassRange2& rng2,
+                            OutputIterator          out)
+{
+    BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange1> ));
+    BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange2> ));
+    return std::merge(boost::begin(rng1), boost::end(rng1),
+                      boost::begin(rng2), boost::end(rng2), out);
+}
+
+/// \overload
+template<class SinglePassRange1, class SinglePassRange2,
+         class OutputIterator, class BinaryPredicate>
+inline OutputIterator merge(const SinglePassRange1& rng1,
+                            const SinglePassRange2& rng2,
+                            OutputIterator          out,
+                            BinaryPredicate         pred)
+{
+    BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange1> ));
+    BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange2> ));
+    return std::merge(boost::begin(rng1), boost::end(rng1),
+                      boost::begin(rng2), boost::end(rng2), out, pred);
+}
+
+    } // namespace range
+    using range::merge;
+} // namespace boost
+
+#endif // include guard