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diff --git a/src/third_party/boost-1.69.0/boost/range/adaptor/sliced.hpp b/src/third_party/boost-1.69.0/boost/range/adaptor/sliced.hpp
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+++ b/src/third_party/boost-1.69.0/boost/range/adaptor/sliced.hpp
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+// Boost.Range library
+//
+//  Copyright Thorsten Ottosen, Neil Groves 2006 - 2008. 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_ADAPTOR_SLICED_HPP
+#define BOOST_RANGE_ADAPTOR_SLICED_HPP
+
+#include <boost/range/adaptor/argument_fwd.hpp>
+#include <boost/range/size_type.hpp>
+#include <boost/range/iterator_range.hpp>
+#include <boost/range/concepts.hpp>
+#include <boost/next_prior.hpp>
+
+namespace boost
+{
+    namespace adaptors
+    {
+        struct sliced
+        {
+            sliced(std::size_t t_, std::size_t u_)
+                : t(t_), u(u_) {}
+            std::size_t t;
+            std::size_t u;
+        };
+
+        template< class RandomAccessRange >
+        class sliced_range : public boost::iterator_range< BOOST_DEDUCED_TYPENAME range_iterator<RandomAccessRange>::type >
+        {
+            typedef boost::iterator_range< BOOST_DEDUCED_TYPENAME range_iterator<RandomAccessRange>::type > base_t;
+        public:
+            template<typename Rng, typename T, typename U>
+            sliced_range(Rng& rng, T t, U u)
+                : base_t(boost::next(boost::begin(rng), t),
+                         boost::next(boost::begin(rng), u))
+            {
+            }
+        };
+
+        template< class RandomAccessRange >
+        inline sliced_range<RandomAccessRange>
+        slice( RandomAccessRange& rng, std::size_t t, std::size_t u )
+        {
+            BOOST_RANGE_CONCEPT_ASSERT((
+                RandomAccessRangeConcept<RandomAccessRange>));
+
+            BOOST_ASSERT( t <= u && "error in slice indices" );
+            BOOST_ASSERT( static_cast<std::size_t>(boost::size(rng)) >= u &&
+                          "second slice index out of bounds" );
+
+            return sliced_range<RandomAccessRange>(rng, t, u);
+        }
+
+        template< class RandomAccessRange >
+        inline iterator_range< BOOST_DEDUCED_TYPENAME range_iterator<const RandomAccessRange>::type >
+        slice( const RandomAccessRange& rng, std::size_t t, std::size_t u )
+        {
+            BOOST_RANGE_CONCEPT_ASSERT((
+                RandomAccessRangeConcept<const RandomAccessRange>));
+
+            BOOST_ASSERT( t <= u && "error in slice indices" );
+            BOOST_ASSERT( static_cast<std::size_t>(boost::size(rng)) >= u &&
+                          "second slice index out of bounds" );
+
+            return sliced_range<const RandomAccessRange>(rng, t, u);
+        }
+
+        template< class RandomAccessRange >
+        inline sliced_range<RandomAccessRange>
+        operator|( RandomAccessRange& r, const sliced& f )
+        {
+            BOOST_RANGE_CONCEPT_ASSERT((
+                RandomAccessRangeConcept<RandomAccessRange>));
+
+            return sliced_range<RandomAccessRange>( r, f.t, f.u );
+        }
+
+        template< class RandomAccessRange >
+        inline sliced_range<const RandomAccessRange>
+        operator|( const RandomAccessRange& r, const sliced& f )
+        {
+            BOOST_RANGE_CONCEPT_ASSERT((
+                RandomAccessRangeConcept<const RandomAccessRange>));
+
+            return sliced_range<const RandomAccessRange>( r, f.t, f.u );
+        }
+
+    } // namespace adaptors
+    using adaptors::sliced_range;
+} // namespace boost
+
+#endif