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diff --git a/src/third_party/boost-1.69.0/boost/range/algorithm/fill_n.hpp b/src/third_party/boost-1.69.0/boost/range/algorithm/fill_n.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_FILL_N_HPP_INCLUDED
+#define BOOST_RANGE_ALGORITHM_FILL_N_HPP_INCLUDED
+
+#include <boost/assert.hpp>
+#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 fill_n
+///
+/// range-based version of the fill_n std algorithm
+///
+/// \pre ForwardRange is a model of the ForwardRangeConcept
+/// \pre n <= std::distance(boost::begin(rng), boost::end(rng))
+template< class ForwardRange, class Size, class Value >
+inline ForwardRange& fill_n(ForwardRange& rng, Size n, const Value& val)
+{
+    BOOST_RANGE_CONCEPT_ASSERT(( ForwardRangeConcept<ForwardRange> ));
+    BOOST_ASSERT( static_cast<Size>(std::distance(boost::begin(rng), boost::end(rng))) >= n );
+    std::fill_n(boost::begin(rng), n, val);
+    return rng;
+}
+
+/// \overload
+template< class ForwardRange, class Size, class Value >
+inline const ForwardRange& fill_n(const ForwardRange& rng, Size n, const Value& val)
+{
+    BOOST_RANGE_CONCEPT_ASSERT(( ForwardRangeConcept<const ForwardRange> ));
+    BOOST_ASSERT( static_cast<Size>(std::distance(boost::begin(rng), boost::end(rng))) >= n );
+    std::fill_n(boost::begin(rng), n, val);
+    return rng;
+}
+
+    } // namespace range
+    using range::fill_n;
+} // namespace boost
+
+#endif // include guard