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authorStefan Radomski <github@mintwerk.de>2016-05-12 13:12:33 (GMT)
committerStefan Radomski <github@mintwerk.de>2016-05-12 13:12:33 (GMT)
commitb62e7979600feee23dc7cdb61042a8fc7673122b (patch)
treef7351372f37979dd2d048e0b68a16a4cd3b2aadb /contrib/src/boost/mpl/void.hpp
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Major Refactoring v2.0
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diff --git a/contrib/src/boost/mpl/void.hpp b/contrib/src/boost/mpl/void.hpp
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+
+#ifndef BOOST_MPL_VOID_HPP_INCLUDED
+#define BOOST_MPL_VOID_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.
+
+// $Id$
+// $Date$
+// $Revision$
+
+#include <boost/mpl/void_fwd.hpp>
+#include <boost/mpl/bool.hpp>
+#include <boost/mpl/aux_/na_spec.hpp>
+#include <boost/mpl/aux_/config/msvc.hpp>
+#include <boost/mpl/aux_/config/workaround.hpp>
+
+BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_OPEN
+
+// [JDG Feb-4-2003] made void_ a complete type to allow it to be
+// instantiated so that it can be passed in as an object that can be
+// used to select an overloaded function. Possible use includes signaling
+// a zero arity functor evaluation call.
+struct void_ { typedef void_ type; };
+
+BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_CLOSE
+
+namespace boost { namespace mpl {
+
+template< typename T >
+struct is_void_
+ : false_
+{
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+ using false_::value;
+#endif
+};
+
+template<>
+struct is_void_<void_>
+ : true_
+{
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+ using true_::value;
+#endif
+};
+
+template< typename T >
+struct is_not_void_
+ : true_
+{
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+ using true_::value;
+#endif
+};
+
+template<>
+struct is_not_void_<void_>
+ : false_
+{
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
+ using false_::value;
+#endif
+};
+
+BOOST_MPL_AUX_NA_SPEC(1, is_void_)
+BOOST_MPL_AUX_NA_SPEC(1, is_not_void_)
+
+}}
+
+#endif // BOOST_MPL_VOID_HPP_INCLUDED