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diff --git a/src/third_party/boost-1.69.0/boost/iostreams/detail/char_traits.hpp b/src/third_party/boost-1.69.0/boost/iostreams/detail/char_traits.hpp
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+++ b/src/third_party/boost-1.69.0/boost/iostreams/detail/char_traits.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.)
+
+// Provides std::char_traits for libraries without templated streams. Should not
+// be confused with <boost/iostreams/char_traits.hpp>, which defines the
+// template boost::iostreams::char_traits.
+
+// See http://www.boost.org/libs/iostreams for documentation.
+
+#ifndef BOOST_IOSTREAMS_DETAIL_CHAR_TRAITS_HPP_INCLUDED
+#define BOOST_IOSTREAMS_DETAIL_CHAR_TRAITS_HPP_INCLUDED
+
+#if defined(_MSC_VER)
+# pragma once
+#endif
+
+#include <iosfwd>
+#include <boost/iostreams/detail/config/wide_streams.hpp>
+#ifdef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES
+# include <boost/config.hpp> // Make sure size_t is in std.
+# include <cstddef>
+# include <cstring>
+# include <cstdio>
+#endif
+
+#ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //--------------------------------//
+# define BOOST_IOSTREAMS_CHAR_TRAITS(ch) std::char_traits< ch >
+#else
+# define BOOST_IOSTREAMS_CHAR_TRAITS(ch) boost::iostreams::detail::char_traits
+
+namespace boost { namespace iostreams { namespace detail {
+
+struct char_traits  {
+    typedef char            char_type;
+    typedef int             int_type;
+    typedef std::streampos  pos_type;
+    typedef std::streamoff  off_type;
+
+    // Note: this may not be not conforming, since it treats chars as unsigned,
+    // but is only used to test for equality.
+    static int compare(const char* lhs, const char* rhs, std::size_t n)
+    { return std::strncmp(lhs, rhs, n); }
+    static char* copy(char *dest, const char *src, std::size_t n)
+    { return static_cast<char*>(std::memcpy(dest, src, n)); }
+    static char* move(char *dest, const char *src, std::size_t n)
+    { return static_cast<char*>(std::memmove(dest, src, n)); }
+    static const char* find(const char* s, std::size_t n, const char& c)
+    { return (const char*) (const void*) std::memchr(s, c, n); }
+    static char to_char_type(const int& c) { return c; }
+    static int to_int_type(const char& c) { return c; }
+    static bool eq_int_type(const int& lhs, const int& rhs)
+    { return lhs == rhs; }
+    static int eof() { return EOF; }
+    static int not_eof(const int& c) { return c != EOF ? c : '\n'; }
+};
+
+} } } // End namespaces detail, iostreams, boost.
+
+#endif // #ifdef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //-----------------------//
+
+#endif // #ifndef BOOST_IOSTREAMS_DETAIL_CHAR_TRAITS_HPP_INCLUDED