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95 lines
1.7 KiB
95 lines
1.7 KiB
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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: na.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ |
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// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ |
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// $Revision: 49267 $ |
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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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