You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and dots ('.'), can be up to 35 characters long. Letters must be lowercase.
76 lines
1.7 KiB
76 lines
1.7 KiB
|
|
#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
|
|
|