#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: void.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ | |
// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ | |
// $Revision: 49267 $ | |
#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 |