1 files changed, 85 insertions, 0 deletions
diff --git a/src/third_party/boost-1.69.0/boost/type_traits/is_assignable.hpp b/src/third_party/boost-1.69.0/boost/type_traits/is_assignable.hpp
new file mode 100644
index 00000000000..6a9474b2fde
--- /dev/null
+++ b/src/third_party/boost-1.69.0/boost/type_traits/is_assignable.hpp
@@ -0,0 +1,85 @@
+
+//  (C) Copyright John Maddock 2015.
+//  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_ASSIGNABLE_HPP_INCLUDED
+#define BOOST_TT_IS_ASSIGNABLE_HPP_INCLUDED
+
+#include <cstddef> // size_t
+#include <boost/type_traits/integral_constant.hpp>
+#include <boost/detail/workaround.hpp>
+#include <boost/type_traits/is_complete.hpp>
+#include <boost/static_assert.hpp>
+
+namespace boost{
+
+   template <class T, class U = T> struct is_assignable;
+
+}
+
+#if !defined(BOOST_NO_CXX11_DECLTYPE) && !BOOST_WORKAROUND(BOOST_MSVC, < 1800)
+
+#include <boost/type_traits/detail/yes_no_type.hpp>
+#include <boost/type_traits/declval.hpp>
+
+namespace boost{
+
+   namespace detail{
+
+      struct is_assignable_imp
+      {
+         template<typename T, typename U, typename = decltype(boost::declval<T>() = boost::declval<U>())>
+         static boost::type_traits::yes_type test(int);
+
+         template<typename, typename>
+         static boost::type_traits::no_type test(...);
+      };
+
+   }
+
+   template <class T, class U> struct is_assignable : public integral_constant<bool, sizeof(detail::is_assignable_imp::test<T, U>(0)) == sizeof(boost::type_traits::yes_type)>
+   {
+      BOOST_STATIC_ASSERT_MSG(boost::is_complete<T>::value, "Arguments to is_assignable must be complete types");
+   };
+   template <class T, std::size_t N, class U> struct is_assignable<T[N], U> : public is_assignable<T, U>{};
+   template <class T, std::size_t N, class U> struct is_assignable<T(&)[N], U> : public is_assignable<T&, U>{};
+   template <class T, class U> struct is_assignable<T[], U> : public is_assignable<T, U>{};
+   template <class T, class U> struct is_assignable<T(&)[], U> : public is_assignable<T&, U>{};
+   template <class U> struct is_assignable<void, U> : public integral_constant<bool, false>{};
+   template <class U> struct is_assignable<void const, U> : public integral_constant<bool, false>{};
+   template <class U> struct is_assignable<void volatile, U> : public integral_constant<bool, false>{};
+   template <class U> struct is_assignable<void const volatile, U> : public integral_constant<bool, false>{};
+
+#else
+
+#include <boost/type_traits/has_trivial_assign.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+
+namespace boost{
+
+   // We don't know how to implement this:
+   template <class T, class U> struct is_assignable : public integral_constant<bool, false>
+   {
+      BOOST_STATIC_ASSERT_MSG(boost::is_complete<T>::value, "Arguments to is_assignable must be complete types");
+   };
+   template <class T, class U> struct is_assignable<T&, U> : public integral_constant<bool, is_pod<T>::value && is_pod<typename remove_reference<U>::type>::value>{};
+   template <class T, class U> struct is_assignable<const T&, U> : public integral_constant<bool, false>{};
+   template <class U> struct is_assignable<void, U> : public integral_constant<bool, false>{};
+   template <class U> struct is_assignable<void const, U> : public integral_constant<bool, false>{};
+   template <class U> struct is_assignable<void volatile, U> : public integral_constant<bool, false>{};
+   template <class U> struct is_assignable<void const volatile, U> : public integral_constant<bool, false>{};
+   /*
+   template <> struct is_assignable<void, void> : public integral_constant<bool, false>{};
+   template <> struct is_assignable<void const, void const> : public integral_constant<bool, false>{};
+   template <> struct is_assignable<void volatile, void volatile> : public integral_constant<bool, false>{};
+   template <> struct is_assignable<void const volatile, void const volatile> : public integral_constant<bool, false>{};
+   */
+#endif
+
+} // namespace boost
+
+#endif // BOOST_TT_IS_ASSIGNABLE_HPP_INCLUDED