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diff --git a/src/third_party/boost-1.60.0/boost/accumulators/framework/accumulators/external_accumulator.hpp b/src/third_party/boost-1.60.0/boost/accumulators/framework/accumulators/external_accumulator.hpp
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+++ b/src/third_party/boost-1.60.0/boost/accumulators/framework/accumulators/external_accumulator.hpp
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+///////////////////////////////////////////////////////////////////////////////
+// external_accumulator.hpp
+//
+//  Copyright 2005 Eric Niebler. Distributed under 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)
+
+#ifndef BOOST_ACCUMULATORS_FRAMEWORK_ACCUMULATORS_EXTERNAL_ACCUMULATOR_HPP_EAN_01_12_2005
+#define BOOST_ACCUMULATORS_FRAMEWORK_ACCUMULATORS_EXTERNAL_ACCUMULATOR_HPP_EAN_01_12_2005
+
+#include <boost/mpl/placeholders.hpp>
+#include <boost/parameter/keyword.hpp>
+#include <boost/accumulators/framework/extractor.hpp>
+#include <boost/accumulators/framework/depends_on.hpp> // for feature_tag
+#include <boost/accumulators/framework/accumulator_base.hpp>
+#include <boost/accumulators/framework/accumulators/reference_accumulator.hpp>
+
+namespace boost { namespace accumulators { namespace impl
+{
+
+    //////////////////////////////////////////////////////////////////////////
+    // external_impl
+    /// INTERNAL ONLY
+    ///
+    template<typename Accumulator, typename Tag>
+    struct external_impl
+      : accumulator_base
+    {
+        typedef typename Accumulator::result_type result_type;
+        typedef typename detail::feature_tag<Accumulator>::type feature_tag;
+
+        external_impl(dont_care) {}
+
+        template<typename Args>
+        result_type result(Args const &args) const
+        {
+            return this->extract_(args, args[parameter::keyword<Tag>::get() | 0]);
+        }
+
+    private:
+
+        template<typename Args>
+        static result_type extract_(Args const &args, int)
+        {
+            // No named parameter passed to the extractor. Maybe the external
+            // feature is held by reference<>.
+            extractor<feature_tag> extract;
+            return extract(accumulators::reference_tag<Tag>(args));
+        }
+
+        template<typename Args, typename AccumulatorSet>
+        static result_type extract_(Args const &, AccumulatorSet const &acc)
+        {
+            // OK, a named parameter for this external feature was passed to the
+            // extractor, so use that.
+            extractor<feature_tag> extract;
+            return extract(acc);
+        }
+    };
+
+} // namespace impl
+
+namespace tag
+{
+    //////////////////////////////////////////////////////////////////////////
+    // external
+    template<typename Feature, typename Tag, typename AccumulatorSet>
+    struct external
+      : depends_on<reference<AccumulatorSet, Tag> >
+    {
+        typedef
+            accumulators::impl::external_impl<
+                detail::to_accumulator<Feature, mpl::_1, mpl::_2>
+              , Tag
+            >
+        impl;
+    };
+
+    template<typename Feature, typename Tag>
+    struct external<Feature, Tag, void>
+      : depends_on<>
+    {
+        typedef
+            accumulators::impl::external_impl<
+                detail::to_accumulator<Feature, mpl::_1, mpl::_2>
+              , Tag
+            >
+        impl;
+    };
+}
+
+// for the purposes of feature-based dependency resolution,
+// external_accumulator<Feature, Tag> provides the same feature as Feature
+template<typename Feature, typename Tag, typename AccumulatorSet>
+struct feature_of<tag::external<Feature, Tag, AccumulatorSet> >
+  : feature_of<Feature>
+{
+};
+
+// Note: Usually, the extractor is pulled into the accumulators namespace with
+// a using directive, not the tag. But the external<> feature doesn't have an
+// extractor, so we can put the external tag in the accumulators namespace
+// without fear of a name conflict.
+using tag::external;
+
+}} // namespace boost::accumulators
+
+#endif