imgtools/imglib/boostlibrary/boost/mpl/void.hpp
author timothy.murphy@nokia.com
Fri, 19 Feb 2010 19:06:05 +0000
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release note: SB Bug 1861
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#ifndef BOOST_MPL_VOID_HPP_INCLUDED
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#define BOOST_MPL_VOID_HPP_INCLUDED
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// Copyright Aleksey Gurtovoy 2001-2004
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//
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// Distributed under the Boost Software License, Version 1.0. 
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// (See accompanying file LICENSE_1_0.txt or copy at 
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/mpl for documentation.
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// $Id: void.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
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// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
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// $Revision: 49267 $
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#include <boost/mpl/void_fwd.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/aux_/na_spec.hpp>
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#include <boost/mpl/aux_/config/msvc.hpp>
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#include <boost/mpl/aux_/config/workaround.hpp>
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BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_OPEN
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//  [JDG Feb-4-2003] made void_ a complete type to allow it to be
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//  instantiated so that it can be passed in as an object that can be
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//  used to select an overloaded function. Possible use includes signaling
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//  a zero arity functor evaluation call.
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struct void_ { typedef void_ type; };
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BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_CLOSE
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namespace boost { namespace mpl {
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template< typename T >
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struct is_void_
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    : false_
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{
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#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
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    using false_::value;
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#endif
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};
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template<>
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struct is_void_<void_>
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    : true_
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{
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#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
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    using true_::value;
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#endif
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};
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template< typename T >
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struct is_not_void_
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    : true_
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{
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#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
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    using true_::value;
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#endif
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};
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template<>
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struct is_not_void_<void_>
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    : false_
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{
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#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
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    using false_::value;
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#endif
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};
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BOOST_MPL_AUX_NA_SPEC(1, is_void_)
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BOOST_MPL_AUX_NA_SPEC(1, is_not_void_)
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}}
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#endif // BOOST_MPL_VOID_HPP_INCLUDED