epoc32/include/stdapis/boost/mpl/aux_/na.hpp
author William Roberts <williamr@symbian.org>
Wed, 31 Mar 2010 12:27:01 +0100
branchSymbian2
changeset 3 e1b950c65cb4
permissions -rw-r--r--
Attempt to represent the S^2->S^3 header reorganisation as a series of "hg rename" operations
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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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// $Source: /cvsroot/boost/boost/boost/mpl/aux_/na.hpp,v $
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// $Date: 2004/11/28 01:37:30 $
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// $Revision: 1.6 $
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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