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/Src/Dependencies/Boost/boost/mpl/aux_/na.hpp

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 1
 2#ifndef BOOST_MPL_AUX_NA_HPP_INCLUDED
 3#define BOOST_MPL_AUX_NA_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: na.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/bool.hpp>
18#include <boost/mpl/aux_/na_fwd.hpp>
19#include <boost/mpl/aux_/config/msvc.hpp>
20#include <boost/mpl/aux_/config/ctps.hpp>
21
22namespace boost { namespace mpl {
23
24template< typename T >
25struct is_na
26    : false_
27{
28#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
29    using false_::value;
30#endif
31};
32
33template<>
34struct is_na<na>
35    : true_
36{
37#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
38    using true_::value;
39#endif
40};
41
42template< typename T >
43struct is_not_na
44    : true_
45{
46#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
47    using true_::value;
48#endif
49};
50
51template<>
52struct is_not_na<na>
53    : false_
54{
55#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
56    using false_::value;
57#endif
58};
59
60#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
61template< typename T, typename U > struct if_na
62{
63    typedef T type;
64};
65
66template< typename U > struct if_na<na,U>
67{
68    typedef U type;
69};
70#else
71template< typename T > struct if_na_impl
72{
73    template< typename U > struct apply
74    {
75        typedef T type;
76    };
77};
78
79template<> struct if_na_impl<na>
80{
81    template< typename U > struct apply
82    {
83        typedef U type;
84    };
85};
86
87template< typename T, typename U > struct if_na
88    : if_na_impl<T>::template apply<U>
89{
90};
91#endif
92
93}}
94
95#endif // BOOST_MPL_AUX_NA_HPP_INCLUDED