2 #ifndef BOOST_MPL_AUX_NA_HPP_INCLUDED
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3 #define BOOST_MPL_AUX_NA_HPP_INCLUDED
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5 // Copyright Aleksey Gurtovoy 2001-2004
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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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11 // See http://www.boost.org/libs/mpl for documentation.
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13 // $Id: na.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
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14 // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
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15 // $Revision: 49267 $
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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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22 namespace boost { namespace mpl {
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24 template< typename T >
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28 #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
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29 using false_::value;
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37 #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
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42 template< typename T >
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46 #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
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52 struct is_not_na<na>
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55 #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
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56 using false_::value;
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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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66 template< typename U > struct if_na<na,U>
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71 template< typename T > struct if_na_impl
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73 template< typename U > struct apply
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79 template<> struct if_na_impl<na>
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81 template< typename U > struct apply
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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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95 #endif // BOOST_MPL_AUX_NA_HPP_INCLUDED
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