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diff --git a/src/third_party/boost-1.69.0/boost/range/algorithm/nth_element.hpp b/src/third_party/boost-1.69.0/boost/range/algorithm/nth_element.hpp
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+++ b/src/third_party/boost-1.69.0/boost/range/algorithm/nth_element.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_NTH_ELEMENT_HPP_INCLUDED
+#define BOOST_RANGE_ALGORITHM_NTH_ELEMENT_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 nth_element
+///
+/// range-based version of the nth_element std algorithm
+///
+/// \pre RandomAccessRange is a model of the RandomAccessRangeConcept
+/// \pre BinaryPredicate is a model of the BinaryPredicateConcept
+template<class RandomAccessRange>
+inline RandomAccessRange& nth_element(RandomAccessRange& rng,
+    BOOST_DEDUCED_TYPENAME range_iterator<RandomAccessRange>::type nth)
+{
+    BOOST_RANGE_CONCEPT_ASSERT(( RandomAccessRangeConcept<RandomAccessRange> ));
+    std::nth_element(boost::begin(rng), nth, boost::end(rng));
+    return rng;
+}
+
+/// \overload
+template<class RandomAccessRange>
+inline const RandomAccessRange& nth_element(const RandomAccessRange& rng,
+    BOOST_DEDUCED_TYPENAME range_iterator<const RandomAccessRange>::type nth)
+{
+    BOOST_RANGE_CONCEPT_ASSERT(( RandomAccessRangeConcept<const RandomAccessRange> ));
+    std::nth_element(boost::begin(rng), nth, boost::end(rng));
+    return rng;
+}
+
+/// \overload
+template<class RandomAccessRange, class BinaryPredicate>
+inline RandomAccessRange& nth_element(RandomAccessRange& rng,
+    BOOST_DEDUCED_TYPENAME range_iterator<RandomAccessRange>::type nth,
+    BinaryPredicate sort_pred)
+{
+    BOOST_RANGE_CONCEPT_ASSERT(( RandomAccessRangeConcept<RandomAccessRange> ));
+    std::nth_element(boost::begin(rng), nth, boost::end(rng), sort_pred);
+    return rng;
+}
+
+/// \overload
+template<class RandomAccessRange, class BinaryPredicate>
+inline const RandomAccessRange& nth_element(const RandomAccessRange& rng,
+    BOOST_DEDUCED_TYPENAME range_iterator<const RandomAccessRange>::type nth,
+    BinaryPredicate sort_pred)
+{
+    BOOST_RANGE_CONCEPT_ASSERT(( RandomAccessRangeConcept<const RandomAccessRange> ));
+    std::nth_element(boost::begin(rng), nth, boost::end(rng), sort_pred);
+    return rng;
+}
+
+    } // namespace range
+    using range::nth_element;
+} // namespace boost
+
+#endif // include guard