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diff --git a/src/third_party/boost-1.60.0/boost/lexical_cast.hpp b/src/third_party/boost-1.60.0/boost/lexical_cast.hpp
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+// Copyright Kevlin Henney, 2000-2005.
+// Copyright Alexander Nasonov, 2006-2010.
+// Copyright Antony Polukhin, 2011-2014.
+//
+// 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)
+//
+// what:  lexical_cast custom keyword cast
+// who:   contributed by Kevlin Henney,
+//        enhanced with contributions from Terje Slettebo,
+//        with additional fixes and suggestions from Gennaro Prota,
+//        Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
+//        Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
+//        Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
+// when:  November 2000, March 2003, June 2005, June 2006, March 2011 - 2014
+
+#ifndef BOOST_LEXICAL_CAST_INCLUDED
+#define BOOST_LEXICAL_CAST_INCLUDED
+
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#   pragma once
+#endif
+
+#if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_WSTRING)
+#define BOOST_LCAST_NO_WCHAR_T
+#endif
+
+#include <boost/range/iterator_range_core.hpp>
+#include <boost/lexical_cast/bad_lexical_cast.hpp>
+#include <boost/lexical_cast/try_lexical_convert.hpp>
+
+namespace boost 
+{
+    template <typename Target, typename Source>
+    inline Target lexical_cast(const Source &arg)
+    {
+        Target result;
+
+        if (!boost::conversion::detail::try_lexical_convert(arg, result)) {
+            boost::conversion::detail::throw_bad_cast<Source, Target>();
+        }
+
+        return result;
+    }
+
+    template <typename Target>
+    inline Target lexical_cast(const char* chars, std::size_t count)
+    {
+        return ::boost::lexical_cast<Target>(
+            ::boost::iterator_range<const char*>(chars, chars + count)
+        );
+    }
+
+    template <typename Target>
+    inline Target lexical_cast(const unsigned char* chars, std::size_t count)
+    {
+        return ::boost::lexical_cast<Target>(
+            ::boost::iterator_range<const unsigned char*>(chars, chars + count)
+        );
+    }
+
+    template <typename Target>
+    inline Target lexical_cast(const signed char* chars, std::size_t count)
+    {
+        return ::boost::lexical_cast<Target>(
+            ::boost::iterator_range<const signed char*>(chars, chars + count)
+        );
+    }
+
+#ifndef BOOST_LCAST_NO_WCHAR_T
+    template <typename Target>
+    inline Target lexical_cast(const wchar_t* chars, std::size_t count)
+    {
+        return ::boost::lexical_cast<Target>(
+            ::boost::iterator_range<const wchar_t*>(chars, chars + count)
+        );
+    }
+#endif
+#ifndef BOOST_NO_CXX11_CHAR16_T
+    template <typename Target>
+    inline Target lexical_cast(const char16_t* chars, std::size_t count)
+    {
+        return ::boost::lexical_cast<Target>(
+            ::boost::iterator_range<const char16_t*>(chars, chars + count)
+        );
+    }
+#endif
+#ifndef BOOST_NO_CXX11_CHAR32_T
+    template <typename Target>
+    inline Target lexical_cast(const char32_t* chars, std::size_t count)
+    {
+        return ::boost::lexical_cast<Target>(
+            ::boost::iterator_range<const char32_t*>(chars, chars + count)
+        );
+    }
+#endif
+
+} // namespace boost
+
+#undef BOOST_LCAST_NO_WCHAR_T
+
+#endif // BOOST_LEXICAL_CAST_INCLUDED
+