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diff --git a/src/third_party/boost-1.69.0/boost/range/algorithm/count.hpp b/src/third_party/boost-1.69.0/boost/range/algorithm/count.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_COUNT_HPP_INCLUDED
+#define BOOST_RANGE_ALGORITHM_COUNT_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/difference_type.hpp>
+#include <algorithm>
+
+namespace boost
+{
+    namespace range
+    {
+
+/// \brief template function count
+///
+/// range-based version of the count std algorithm
+///
+/// \pre SinglePassRange is a model of the SinglePassRangeConcept
+template< class SinglePassRange, class Value >
+inline BOOST_DEDUCED_TYPENAME range_difference<SinglePassRange>::type
+count(SinglePassRange& rng, const Value& val)
+{
+    BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<SinglePassRange> ));
+    return std::count(boost::begin(rng), boost::end(rng), val);
+}
+
+/// \overload
+template< class SinglePassRange, class Value >
+inline BOOST_DEDUCED_TYPENAME range_difference<SinglePassRange const>::type
+count(const SinglePassRange& rng, const Value& val)
+{
+    BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange> ));
+    return std::count(boost::begin(rng), boost::end(rng), val);
+}
+
+    } // namespace range
+    using range::count;
+} // namespace boost
+
+#endif // include guard