You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
77 lines
1.6 KiB
77 lines
1.6 KiB
3 years ago
|
|
||
|
|
#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
|