From 69932d18160ed36375ddddc218753ca3e35ce7bb Mon Sep 17 00:00:00 2001
From: nobody <nobody@localhost>
Date: Thu, 15 Jan 2004 15:33:36 +0000
Subject: [PATCH] This commit was manufactured by cvs2svn to create branch
 'RC_1_31_0'.

[SVN r21755]
---
 include/boost/type_traits/is_abstract.hpp | 91 +++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100755 include/boost/type_traits/is_abstract.hpp

diff --git a/include/boost/type_traits/is_abstract.hpp b/include/boost/type_traits/is_abstract.hpp
new file mode 100755
index 0000000..2d2ff0b
--- /dev/null
+++ b/include/boost/type_traits/is_abstract.hpp
@@ -0,0 +1,91 @@
+#ifndef BOOST_TT_IS_ABSTRACT_CLASS_HPP
+#define BOOST_TT_IS_ABSTRACT_CLASS_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
+// is_abstract_class.hpp:
+//
+//  (C) Copyright 2002 Rani Sharoni (rani_sharoni@hotmail.com) and Robert Ramey
+//  Use, modification and distribution is 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 for updates, documentation, and revision history.
+//
+
+// Compile type discovery whether given type is abstract class or not.
+//
+//   Requires DR 337 to be supported by compiler
+//   (http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/cwg_active.html#337).
+//
+//
+// Believed (Jan 2004) to work on:
+//  - GCC 3.4
+//  - VC++ 7.1
+//  - compilers with new EDG frontend (Intel C++ 7, Comeau 4.3.2)
+//
+// Doesn't work on:
+//  - VC++6, VC++7.0 and less
+//  - GCC 3.3.X and less
+//  - Borland C++ 6 and less
+//      
+//
+// History:
+//  - Originally written by Rani Sharoni, see
+//    http://groups.google.com/groups?selm=df893da6.0207110613.75b2fe90%40posting.google.com
+//    At this time supported by EDG (Intel C++ 7, Comeau 4.3.2) and VC7.1.
+//  - Adapted and added into Boost.Serialization library by Robert Ramey 
+//    (starting with submission #10).
+//  - Jan 2004: GCC 3.4 fixed to suport DR337 (Giovanni Bajo).
+//  - Jan 2004: modified to be part of Boost.TypeTraits (Pavel Vozenilek).
+//
+
+#include <boost/type_traits/detail/yes_no_type.hpp>
+#include <boost/type_traits/is_class.hpp>
+#include "boost/type_traits/detail/ice_and.hpp"
+// should be the last #include
+#include "boost/type_traits/detail/bool_trait_def.hpp"
+
+
+namespace boost {
+namespace detail{
+
+template<class T>
+struct is_abstract_imp
+{
+   // 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 type_traits::no_type check(U (*)[1]);
+   template<class U>
+   static type_traits::yes_type check(...);
+
+   // GCC2 won't even parse this template if we embed the computation
+   // of s1 in the computation of value.
+#ifdef __GNUC__
+   BOOST_STATIC_CONSTANT(unsigned, s1 = sizeof(is_abstract_imp<T>::template check<T>(0)));
+#else
+   BOOST_STATIC_CONSTANT(unsigned, s1 = sizeof(check<T>(0)));
+#endif
+    
+   BOOST_STATIC_CONSTANT(bool, value = 
+      (::boost::type_traits::ice_and<
+         ::boost::is_class<T>::value,
+         (s1 == sizeof(type_traits::yes_type))
+      >::value));
+};
+
+}
+
+BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_abstract,T,::boost::detail::is_abstract_imp<T>::value)
+
+} // namespace boost
+
+#include "boost/type_traits/detail/bool_trait_undef.hpp"
+
+#endif //BOOST_TT_IS_ABSTRACT_CLASS_HPP