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diff --git a/src/third_party/boost-1.69.0/boost/iostreams/detail/bool_trait_def.hpp b/src/third_party/boost-1.69.0/boost/iostreams/detail/bool_trait_def.hpp
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+++ b/src/third_party/boost-1.69.0/boost/iostreams/detail/bool_trait_def.hpp
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+// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
+// (C) Copyright 2003-2007 Jonathan Turkanis
+// 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.)
+
+// See http://www.boost.org/libs/iostreams for documentation.
+
+#ifndef BOOST_IOSTREAMS_DETAIL_BOOL_TRAIT_DEF_HPP_INCLUDED
+#define BOOST_IOSTREAMS_DETAIL_BOOL_TRAIT_DEF_HPP_INCLUDED     
+
+#include <boost/config.hpp> // BOOST_STATIC_CONSTANT.
+#include <boost/iostreams/detail/template_params.hpp>
+#include <boost/mpl/aux_/lambda_support.hpp>
+#include <boost/mpl/bool.hpp>
+#include <boost/preprocessor/cat.hpp>
+#include <boost/preprocessor/repetition/enum_params.hpp>
+#include <boost/type_traits/detail/yes_no_type.hpp>
+ 
+// 
+// Macro name: BOOST_IOSTREAMS_BOOL_TRAIT_DEF
+// Description: Used to generate the traits classes is_istream, is_ostream,
+//      etc.
+//
+#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x582))
+# define BOOST_IOSTREAMS_TRAIT_NAMESPACE(trait)
+#else
+# define BOOST_IOSTREAMS_TRAIT_NAMESPACE(trait) BOOST_PP_CAT(trait, _impl_):: 
+#endif
+#define BOOST_IOSTREAMS_BOOL_TRAIT_DEF(trait, type, arity) \
+    namespace BOOST_PP_CAT(trait, _impl_) { \
+      BOOST_IOSTREAMS_TEMPLATE_PARAMS(arity, T) \
+      type_traits::yes_type helper \
+          (const volatile type BOOST_IOSTREAMS_TEMPLATE_ARGS(arity, T)*); \
+      type_traits::no_type helper(...); \
+      template<typename T> \
+      struct impl { \
+           BOOST_STATIC_CONSTANT(bool, value = \
+           (sizeof(BOOST_IOSTREAMS_TRAIT_NAMESPACE(trait) \
+              helper(static_cast<T*>(0))) == \
+                sizeof(type_traits::yes_type))); \
+      }; \
+    } \
+    template<typename T> \
+    struct trait \
+        : mpl::bool_<BOOST_PP_CAT(trait, _impl_)::impl<T>::value> \
+    { BOOST_MPL_AUX_LAMBDA_SUPPORT(1, trait, (T)) }; \
+    /**/
+
+#endif // #ifndef BOOST_IOSTREAMS_DETAIL_BOOL_TRAIT_DEF_HPP_INCLUDED