1 files changed, 53 insertions, 0 deletions
diff --git a/src/boost/libs/config/test/boost_no_is_abstract.ipp b/src/boost/libs/config/test/boost_no_is_abstract.ipp
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+++ b/src/boost/libs/config/test/boost_no_is_abstract.ipp
@@ -0,0 +1,53 @@
+//  (C) Copyright John Maddock and Dave Abrahams 2002.
+//  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/config for most recent version.
+
+//  MACRO:         BOOST_NO_IS_ABSTRACT
+//  TITLE:         is_abstract implementation technique
+//  DESCRIPTION:   Some compilers can't handle the code used for is_abstract even if they support SFINAE.
+
+
+namespace boost_no_is_abstract{
+
+#if defined(__CODEGEARC__)
+template<class T>
+struct is_abstract_test
+{
+   enum{ value = __is_abstract(T) };
+};
+#else
+template<class T>
+struct is_abstract_test
+{
+   // Deduction fails if T is void, function type,
+   // reference type (14.8.2/2)or an abstract class type
+   // according to review status issue #337
+   //
+   template<class U>
+   static double check_sig(U (*)[1]);
+   template<class U>
+   static char check_sig(...);
+
+#ifdef __GNUC__
+   enum{ s1 = sizeof(is_abstract_test<T>::template check_sig<T>(0)) };
+#else
+   enum{ s1 = sizeof(check_sig<T>(0)) };
+#endif
+
+   enum{ value = (s1 == sizeof(char)) };
+};
+#endif
+
+struct non_abstract{};
+struct abstract{ virtual void foo() = 0; };
+
+int test()
+{
+   return static_cast<bool>(is_abstract_test<non_abstract>::value) == static_cast<bool>(is_abstract_test<abstract>::value);
+}
+
+}
+