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diff --git a/src/third_party/boost-1.56.0/boost/type_traits/is_const.hpp b/src/third_party/boost-1.56.0/boost/type_traits/is_const.hpp
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+++ b/src/third_party/boost-1.56.0/boost/type_traits/is_const.hpp
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+
+//  (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, 
+//      Howard Hinnant and John Maddock 2000. 
+//  (C) Copyright Mat Marcus, Jesse Jones and Adobe Systems Inc 2001
+
+//  Use, modification and distribution are 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).
+//
+//  See http://www.boost.org/libs/type_traits for most recent version including documentation.
+
+//    Fixed is_pointer, is_reference, is_const, is_volatile, is_same, 
+//    is_member_pointer based on the Simulated Partial Specialization work 
+//    of Mat Marcus and Jesse Jones. See  http://opensource.adobe.com or 
+//    http://groups.yahoo.com/group/boost/message/5441 
+//    Some workarounds in here use ideas suggested from "Generic<Programming>: 
+//    Mappings between Types and Values" 
+//    by Andrei Alexandrescu (see http://www.cuj.com/experts/1810/alexandr.html).
+
+
+#ifndef BOOST_TT_IS_CONST_HPP_INCLUDED
+#define BOOST_TT_IS_CONST_HPP_INCLUDED
+
+#include <boost/config.hpp>
+#include <boost/detail/workaround.hpp>
+
+#   include <boost/type_traits/detail/cv_traits_impl.hpp>
+#   ifdef __GNUC__
+#       include <boost/type_traits/is_reference.hpp>
+#   endif
+#   if BOOST_WORKAROUND(BOOST_MSVC, < 1400)
+#       include <boost/type_traits/remove_bounds.hpp>
+#   endif
+
+// should be the last #include
+#include <boost/type_traits/detail/bool_trait_def.hpp>
+
+namespace boost {
+
+#if defined( __CODEGEARC__ )
+
+BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_const,T,__is_const(T))
+
+#else
+
+namespace detail{
+//
+// We can't filter out rvalue_references at the same level as
+// references or we get ambiguities from msvc:
+//
+template <class T>
+struct is_const_rvalue_filter
+{
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1400)
+   BOOST_STATIC_CONSTANT(bool, value = ::boost::detail::cv_traits_imp<typename boost::remove_bounds<T>::type*>::is_const);
+#else
+   BOOST_STATIC_CONSTANT(bool, value = ::boost::detail::cv_traits_imp<BOOST_TT_AUX_CV_TRAITS_IMPL_PARAM(T)>::is_const);
+#endif
+};
+#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
+template <class T>
+struct is_const_rvalue_filter<T&&>
+{
+   BOOST_STATIC_CONSTANT(bool, value = false);
+};
+#endif
+}
+
+//* is a type T  declared const - is_const<T>
+BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_const,T,::boost::detail::is_const_rvalue_filter<T>::value)
+BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_const,T&,false)
+
+#if  defined(BOOST_ILLEGAL_CV_REFERENCES)
+// these are illegal specialisations; cv-qualifies applied to
+// references have no effect according to [8.3.2p1],
+// C++ Builder requires them though as it treats cv-qualified
+// references as distinct types...
+BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_const,T& const,false)
+BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_const,T& volatile,false)
+BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_const,T& const volatile,false)
+#endif
+
+#endif
+
+} // namespace boost
+
+#include <boost/type_traits/detail/bool_trait_undef.hpp>
+
+#endif // BOOST_TT_IS_CONST_HPP_INCLUDED
+