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/Src/Dependencies/Boost/boost/mpl/void.hpp

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 1
 2#ifndef BOOST_MPL_VOID_HPP_INCLUDED
 3#define BOOST_MPL_VOID_HPP_INCLUDED
 4
 5// Copyright Aleksey Gurtovoy 2001-2004
 6//
 7// Distributed under the Boost Software License, Version 1.0. 
 8// (See accompanying file LICENSE_1_0.txt or copy at 
 9// http://www.boost.org/LICENSE_1_0.txt)
10//
11// See http://www.boost.org/libs/mpl for documentation.
12
13// $Id: void.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
14// $Date: 2008-10-11 17:19:02 +1100 (Sat, 11 Oct 2008) $
15// $Revision: 49267 $
16
17#include <boost/mpl/void_fwd.hpp>
18#include <boost/mpl/bool.hpp>
19#include <boost/mpl/aux_/na_spec.hpp>
20#include <boost/mpl/aux_/config/msvc.hpp>
21#include <boost/mpl/aux_/config/workaround.hpp>
22
23BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_OPEN
24
25//  [JDG Feb-4-2003] made void_ a complete type to allow it to be
26//  instantiated so that it can be passed in as an object that can be
27//  used to select an overloaded function. Possible use includes signaling
28//  a zero arity functor evaluation call.
29struct void_ { typedef void_ type; };
30
31BOOST_MPL_AUX_ADL_BARRIER_NAMESPACE_CLOSE
32
33namespace boost { namespace mpl {
34
35template< typename T >
36struct is_void_
37    : false_
38{
39#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
40    using false_::value;
41#endif
42};
43
44template<>
45struct is_void_<void_>
46    : true_
47{
48#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
49    using true_::value;
50#endif
51};
52
53template< typename T >
54struct is_not_void_
55    : true_
56{
57#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
58    using true_::value;
59#endif
60};
61
62template<>
63struct is_not_void_<void_>
64    : false_
65{
66#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
67    using false_::value;
68#endif
69};
70
71BOOST_MPL_AUX_NA_SPEC(1, is_void_)
72BOOST_MPL_AUX_NA_SPEC(1, is_not_void_)
73
74}}
75
76#endif // BOOST_MPL_VOID_HPP_INCLUDED