96 lines
1.7 KiB
C++
96 lines
1.7 KiB
C++
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#ifndef BOOST_MPL_AUX_NA_HPP_INCLUDED
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#define BOOST_MPL_AUX_NA_HPP_INCLUDED
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// Copyright Aleksey Gurtovoy 2001-2004
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/mpl for documentation.
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// $Id$
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// $Date$
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// $Revision$
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/aux_/na_fwd.hpp>
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#include <boost/mpl/aux_/config/msvc.hpp>
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#include <boost/mpl/aux_/config/ctps.hpp>
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namespace boost { namespace mpl {
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template< typename T >
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struct is_na
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: false_
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{
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#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
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using false_::value;
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#endif
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};
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template<>
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struct is_na<na>
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: true_
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{
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#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
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using true_::value;
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#endif
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};
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template< typename T >
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struct is_not_na
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: true_
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{
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#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
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using true_::value;
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#endif
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};
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template<>
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struct is_not_na<na>
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: false_
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{
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#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
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using false_::value;
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#endif
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};
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#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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template< typename T, typename U > struct if_na
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{
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typedef T type;
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};
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template< typename U > struct if_na<na,U>
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{
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typedef U type;
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};
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#else
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template< typename T > struct if_na_impl
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{
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template< typename U > struct apply
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{
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typedef T type;
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};
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};
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template<> struct if_na_impl<na>
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{
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template< typename U > struct apply
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{
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typedef U type;
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};
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};
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template< typename T, typename U > struct if_na
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: if_na_impl<T>::template apply<U>
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{
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};
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#endif
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}}
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#endif // BOOST_MPL_AUX_NA_HPP_INCLUDED
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