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diff --git a/src/third_party/boost-1.60.0/boost/type_traits/is_nothrow_move_assignable.hpp b/src/third_party/boost-1.60.0/boost/type_traits/is_nothrow_move_assignable.hpp
new file mode 100644
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--- /dev/null
+++ b/src/third_party/boost-1.60.0/boost/type_traits/is_nothrow_move_assignable.hpp
@@ -0,0 +1,81 @@
+
+//  (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
+//  (C) Copyright Eric Friedman 2002-2003.
+//  (C) Copyright Antony Polukhin 2013.
+//  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.
+
+#ifndef BOOST_TT_IS_NOTHROW_MOVE_ASSIGNABLE_HPP_INCLUDED
+#define BOOST_TT_IS_NOTHROW_MOVE_ASSIGNABLE_HPP_INCLUDED
+
+#include <boost/config.hpp>
+#include <boost/type_traits/has_trivial_move_assign.hpp>
+#include <boost/type_traits/has_nothrow_assign.hpp>
+#include <boost/type_traits/is_array.hpp>
+#include <boost/type_traits/is_reference.hpp>
+#include <boost/utility/enable_if.hpp>
+#include <boost/type_traits/declval.hpp>
+
+namespace boost {
+
+#ifdef BOOST_IS_NOTHROW_MOVE_ASSIGN
+
+template <class T>
+struct is_nothrow_move_assignable : public integral_constant<bool, BOOST_IS_NOTHROW_MOVE_ASSIGN(T)>{};
+template <class T> struct is_nothrow_move_assignable<T const> : public false_type{};
+template <class T> struct is_nothrow_move_assignable<T volatile> : public false_type{};
+template <class T> struct is_nothrow_move_assignable<T const volatile> : public false_type{};
+template <class T> struct is_nothrow_move_assignable<T&> : public false_type{};
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) 
+template <class T> struct is_nothrow_move_assignable<T&&> : public false_type{};
+#endif
+
+#elif !defined(BOOST_NO_CXX11_NOEXCEPT) && !defined(BOOST_NO_SFINAE_EXPR)
+
+namespace detail{
+
+template <class T, class Enable = void>
+struct false_or_cpp11_noexcept_move_assignable: public ::boost::false_type {};
+
+template <class T>
+struct false_or_cpp11_noexcept_move_assignable <
+        T,
+        typename ::boost::enable_if_c<sizeof(T) && BOOST_NOEXCEPT_EXPR(::boost::declval<T&>() = ::boost::declval<T>())>::type
+    > : public ::boost::integral_constant<bool, BOOST_NOEXCEPT_EXPR(::boost::declval<T&>() = ::boost::declval<T>())>
+{};
+
+}
+
+template <class T>
+struct is_nothrow_move_assignable : public integral_constant<bool, ::boost::detail::false_or_cpp11_noexcept_move_assignable<T>::value>{};
+
+template <class T> struct is_nothrow_move_assignable<T const> : public ::boost::false_type {};
+template <class T> struct is_nothrow_move_assignable<T const volatile> : public ::boost::false_type{};
+template <class T> struct is_nothrow_move_assignable<T volatile> : public ::boost::false_type{};
+template <class T> struct is_nothrow_move_assignable<T&> : public ::boost::false_type{};
+#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
+template <class T> struct is_nothrow_move_assignable<T&&> : public ::boost::false_type{};
+#endif
+
+#else
+
+template <class T>
+struct is_nothrow_move_assignable : public integral_constant<bool,
+   (::boost::has_trivial_move_assign<T>::value || ::boost::has_nothrow_assign<T>::value) &&  ! ::boost::is_array<T>::value>{};
+
+#endif
+
+
+template <> struct is_nothrow_move_assignable<void> : public false_type{};
+#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
+template <> struct is_nothrow_move_assignable<void const> : public false_type{};
+template <> struct is_nothrow_move_assignable<void const volatile> : public false_type{};
+template <> struct is_nothrow_move_assignable<void volatile> : public false_type{};
+#endif
+
+} // namespace boost
+
+#endif // BOOST_TT_IS_NOTHROW_MOVE_ASSIGNABLE_HPP_INCLUDED