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diff --git a/src/third_party/boost-1.69.0/boost/range/algorithm/adjacent_find.hpp b/src/third_party/boost-1.69.0/boost/range/algorithm/adjacent_find.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_ADJACENT_FIND_HPP_INCLUDED
+#define BOOST_RANGE_ALGORITHM_ADJACENT_FIND_HPP_INCLUDED
+
+#include <boost/concept_check.hpp>
+#include <boost/range/begin.hpp>
+#include <boost/range/end.hpp>
+#include <boost/range/concepts.hpp>
+#include <boost/range/value_type.hpp>
+#include <boost/range/detail/range_return.hpp>
+#include <algorithm>
+
+namespace boost
+{
+    namespace range
+    {
+
+/// \brief template function adjacent_find
+///
+/// range-based version of the adjacent_find std algorithm
+///
+/// \pre ForwardRange is a model of the ForwardRangeConcept
+/// \pre BinaryPredicate is a model of the BinaryPredicateConcept
+template< typename ForwardRange >
+inline typename range_iterator<ForwardRange>::type
+adjacent_find(ForwardRange & rng)
+{
+    BOOST_RANGE_CONCEPT_ASSERT((ForwardRangeConcept<ForwardRange>));
+    return std::adjacent_find(boost::begin(rng),boost::end(rng));
+}
+
+/// \overload
+template< typename ForwardRange >
+inline typename range_iterator<const ForwardRange>::type
+adjacent_find(const ForwardRange& rng)
+{
+    BOOST_RANGE_CONCEPT_ASSERT((ForwardRangeConcept<ForwardRange>));
+    return std::adjacent_find(boost::begin(rng),boost::end(rng));
+}
+
+/// \overload
+template< typename ForwardRange, typename BinaryPredicate >
+inline typename range_iterator<ForwardRange>::type
+adjacent_find(ForwardRange & rng, BinaryPredicate pred)
+{
+    BOOST_RANGE_CONCEPT_ASSERT((ForwardRangeConcept<ForwardRange>));
+    BOOST_RANGE_CONCEPT_ASSERT((BinaryPredicateConcept<BinaryPredicate,
+        typename range_value<ForwardRange>::type,
+        typename range_value<ForwardRange>::type>));
+    return std::adjacent_find(boost::begin(rng),boost::end(rng),pred);
+}
+
+/// \overload
+template< typename ForwardRange, typename BinaryPredicate >
+inline typename range_iterator<const ForwardRange>::type
+adjacent_find(const ForwardRange& rng, BinaryPredicate pred)
+{
+    BOOST_RANGE_CONCEPT_ASSERT((ForwardRangeConcept<ForwardRange>));
+    BOOST_RANGE_CONCEPT_ASSERT((BinaryPredicateConcept<BinaryPredicate,
+        typename range_value<const ForwardRange>::type,
+        typename range_value<const ForwardRange>::type>));
+    return std::adjacent_find(boost::begin(rng),boost::end(rng),pred);
+}
+
+//  range_return overloads
+
+/// \overload
+template< range_return_value re, typename ForwardRange >
+inline typename range_return<ForwardRange,re>::type
+adjacent_find(ForwardRange & rng)
+{
+    BOOST_RANGE_CONCEPT_ASSERT((ForwardRangeConcept<ForwardRange>));
+    return range_return<ForwardRange,re>::
+        pack(std::adjacent_find(boost::begin(rng),boost::end(rng)),
+             rng);
+}
+
+/// \overload
+template< range_return_value re, typename ForwardRange >
+inline typename range_return<const ForwardRange,re>::type
+adjacent_find(const ForwardRange& rng)
+{
+    BOOST_RANGE_CONCEPT_ASSERT((ForwardRangeConcept<ForwardRange>));
+    return range_return<const ForwardRange,re>::
+        pack(std::adjacent_find(boost::begin(rng),boost::end(rng)),
+             rng);
+}
+
+/// \overload
+template< range_return_value re, typename ForwardRange, typename BinaryPredicate >
+inline typename range_return<ForwardRange,re>::type
+adjacent_find(ForwardRange& rng, BinaryPredicate pred)
+{
+    BOOST_RANGE_CONCEPT_ASSERT((ForwardRangeConcept<ForwardRange>));
+    BOOST_RANGE_CONCEPT_ASSERT((BinaryPredicateConcept<BinaryPredicate,
+        typename range_value<ForwardRange>::type,
+        typename range_value<ForwardRange>::type>));
+    return range_return<ForwardRange,re>::
+        pack(std::adjacent_find(boost::begin(rng),boost::end(rng),pred),
+             rng);
+}
+
+/// \overload
+template< range_return_value re, typename ForwardRange, typename BinaryPredicate >
+inline typename range_return<const ForwardRange,re>::type
+adjacent_find(const ForwardRange& rng, BinaryPredicate pred)
+{
+    BOOST_RANGE_CONCEPT_ASSERT((ForwardRangeConcept<ForwardRange>));
+    return range_return<const ForwardRange,re>::
+        pack(std::adjacent_find(boost::begin(rng),boost::end(rng),pred),
+             rng);
+}
+
+    } // namespace range
+    using range::adjacent_find;
+} // namespace boost
+
+#endif // include guard