[857] | 1 |
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| 2 | #ifndef BOOST_MPL_AUX_NA_HPP_INCLUDED
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| 3 | #define BOOST_MPL_AUX_NA_HPP_INCLUDED
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| 4 |
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| 5 | // Copyright Aleksey Gurtovoy 2001-2004
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| 6 | //
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| 7 | // Distributed under the Boost Software License, Version 1.0.
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| 8 | // (See accompanying file LICENSE_1_0.txt or copy at
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| 9 | // http://www.boost.org/LICENSE_1_0.txt)
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| 10 | //
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| 11 | // See http://www.boost.org/libs/mpl for documentation.
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| 12 |
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| 13 | // $Source: /cvsroot/boost/boost/boost/mpl/aux_/na.hpp,v $
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| 14 | // $Date: 2004/11/28 01:37:30 $
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| 15 | // $Revision: 1.6 $
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| 16 |
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| 17 | #include <boost/mpl/bool.hpp>
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| 18 | #include <boost/mpl/aux_/na_fwd.hpp>
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| 19 | #include <boost/mpl/aux_/config/msvc.hpp>
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| 20 | #include <boost/mpl/aux_/config/ctps.hpp>
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| 21 |
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| 22 | namespace boost { namespace mpl {
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| 23 |
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| 24 | template< typename T >
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| 25 | struct is_na
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| 26 | : false_
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| 27 | {
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| 28 | #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
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| 29 | using false_::value;
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| 30 | #endif
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| 31 | };
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| 32 |
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| 33 | template<>
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| 34 | struct is_na<na>
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| 35 | : true_
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| 36 | {
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| 37 | #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
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| 38 | using true_::value;
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| 39 | #endif
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| 40 | };
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| 41 |
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| 42 | template< typename T >
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| 43 | struct is_not_na
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| 44 | : true_
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| 45 | {
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| 46 | #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
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| 47 | using true_::value;
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| 48 | #endif
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| 49 | };
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| 50 |
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| 51 | template<>
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| 52 | struct is_not_na<na>
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| 53 | : false_
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| 54 | {
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| 55 | #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
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| 56 | using false_::value;
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| 57 | #endif
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| 58 | };
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| 59 |
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| 60 | #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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| 61 | template< typename T, typename U > struct if_na
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| 62 | {
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| 63 | typedef T type;
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| 64 | };
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| 65 |
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| 66 | template< typename U > struct if_na<na,U>
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| 67 | {
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| 68 | typedef U type;
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| 69 | };
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| 70 | #else
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| 71 | template< typename T > struct if_na_impl
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| 72 | {
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| 73 | template< typename U > struct apply
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| 74 | {
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| 75 | typedef T type;
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| 76 | };
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| 77 | };
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| 78 |
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| 79 | template<> struct if_na_impl<na>
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| 80 | {
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| 81 | template< typename U > struct apply
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| 82 | {
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| 83 | typedef U type;
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| 84 | };
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| 85 | };
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| 86 |
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| 87 | template< typename T, typename U > struct if_na
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| 88 | : if_na_impl<T>::template apply<U>
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| 89 | {
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| 90 | };
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| 91 | #endif
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| 92 |
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| 93 | }}
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| 94 |
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| 95 | #endif // BOOST_MPL_AUX_NA_HPP_INCLUDED
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