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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