Updated boost to v1.55.0

[rsem.git] / boost / mpl / empty_base.hpp

diff --git a/boost/mpl/empty_base.hpp b/boost/mpl/empty_base.hpp
new file mode 100644 (file)
index 0000000..095003e
--- /dev/null
+++ b/boost/mpl/empty_base.hpp
@@ -0,0 +1,59 @@
+
+#ifndef BOOST_MPL_EMPTY_BASE_HPP_INCLUDED
+#define BOOST_MPL_EMPTY_BASE_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2001-2004
+//
+// Distributed under 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/mpl for documentation.
+
+// $Id: empty_base.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
+// $Date: 2008-10-10 23:19:02 -0700 (Fri, 10 Oct 2008) $
+// $Revision: 49267 $
+
+#include <boost/mpl/bool.hpp>
+#include <boost/mpl/aux_/config/msvc.hpp>
+#include <boost/mpl/aux_/config/workaround.hpp>
+
+#include <boost/type_traits/is_empty.hpp>
+
+// should be always the last #include directive
+#include <boost/type_traits/detail/bool_trait_def.hpp>
+
+namespace boost { namespace mpl {
+
+// empty base class, guaranteed to have no members; inheritance from
+// 'empty_base' through the 'inherit' metafunction is a no-op - see 
+// "mpl/inherit.hpp> header for the details
+struct empty_base {};
+
+template< typename T >
+struct is_empty_base
+    : false_
+{
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+    using false_::value;
+#endif
+};
+
+template<>
+struct is_empty_base<empty_base>
+    : true_
+{
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+    using true_::value;
+#endif
+};
+
+}}
+
+namespace boost {
+BOOST_TT_AUX_BOOL_TRAIT_SPEC1(is_empty, mpl::empty_base, true)
+}
+
+#include <boost/type_traits/detail/bool_trait_undef.hpp>
+
+#endif // BOOST_MPL_EMPTY_BASE_HPP_INCLUDED