Update to boost 1.72

[lyx.git] / 3rdparty / boost / boost / type_traits / has_plus_assign.hpp

diff --git a/3rdparty/boost/boost/type_traits/has_plus_assign.hpp b/3rdparty/boost/boost/type_traits/has_plus_assign.hpp
index cf012e243ca510608e3faa200a1f4ea96d29d596..161ca15815252fb536de256b3ab9663e7b3373b3 100644 (file)
--- a/3rdparty/boost/boost/type_traits/has_plus_assign.hpp
+++ b/3rdparty/boost/boost/type_traits/has_plus_assign.hpp
@@ -56,25 +56,25 @@ namespace boost
 
       struct dont_care;
 
-      template <class T, class U, class Ret, class = boost::void_t<>>
+      template <class T, class U, class Ret, class = void>
       struct has_plus_assign_ret_imp : public boost::false_type {};
 
       template <class T, class U, class Ret>
-      struct has_plus_assign_ret_imp<T, U, Ret, boost::void_t<decltype(std::declval<typename add_reference<T>::type>() += std::declval<typename add_reference<U>::type>())> >
+      struct has_plus_assign_ret_imp<T, U, Ret, typename boost::make_void<decltype(std::declval<typename add_reference<T>::type>() += std::declval<typename add_reference<U>::type>())>::type>
          : public boost::integral_constant<bool, ::boost::is_convertible<decltype(std::declval<typename add_reference<T>::type>() += std::declval<typename add_reference<U>::type>()), Ret>::value> {};
 
-      template <class T, class U, class = boost::void_t<> >
+      template <class T, class U, class = void >
       struct has_plus_assign_void_imp : public boost::false_type {};
 
       template <class T, class U>
-      struct has_plus_assign_void_imp<T, U, boost::void_t<decltype(std::declval<typename add_reference<T>::type>() += std::declval<typename add_reference<U>::type>())> >
+      struct has_plus_assign_void_imp<T, U, typename boost::make_void<decltype(std::declval<typename add_reference<T>::type>() += std::declval<typename add_reference<U>::type>())>::type>
          : public boost::integral_constant<bool, ::boost::is_void<decltype(std::declval<typename add_reference<T>::type>() += std::declval<typename add_reference<U>::type>())>::value> {};
 
-      template <class T, class U, class = boost::void_t<>>
+      template <class T, class U, class = void>
       struct has_plus_assign_dc_imp : public boost::false_type {};
 
       template <class T, class U>
-      struct has_plus_assign_dc_imp<T, U, boost::void_t<decltype(std::declval<typename add_reference<T>::type>() += std::declval<typename add_reference<U>::type>())> >
+      struct has_plus_assign_dc_imp<T, U, typename boost::make_void<decltype(std::declval<typename add_reference<T>::type>() += std::declval<typename add_reference<U>::type>())>::type>
          : public boost::true_type {};
 
       template <class T, class U, class Ret>