imgtools/imglib/boostlibrary/boost/mpl/if.hpp
author Ross Qin <ross.qin@nokia.com>
Tue, 30 Nov 2010 13:59:58 +0800
changeset 712 df89378e9223
parent 0 044383f39525
permissions -rw-r--r--
Fix these errors: Some cases of PREQ1230 fail because of buildrom issue rombuild crashs when create ext-romimage readimage crashes on reading wk42 vasco_ui core image vc2008 compiling issues
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#ifndef BOOST_MPL_IF_HPP_INCLUDED
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#define BOOST_MPL_IF_HPP_INCLUDED
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// Copyright Aleksey Gurtovoy 2000-2004
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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: if.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/aux_/value_wknd.hpp>
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#include <boost/mpl/aux_/static_cast.hpp>
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#include <boost/mpl/aux_/na_spec.hpp>
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#include <boost/mpl/aux_/lambda_support.hpp>
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#include <boost/mpl/aux_/config/integral.hpp>
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#include <boost/mpl/aux_/config/ctps.hpp>
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#include <boost/mpl/aux_/config/workaround.hpp>
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namespace boost { namespace mpl {
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#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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template<
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      bool C
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    , typename T1
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    , typename T2
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    >
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struct if_c
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{
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    typedef T1 type;
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};
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template<
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      typename T1
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    , typename T2
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    >
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struct if_c<false,T1,T2>
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{
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    typedef T2 type;
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};
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// agurt, 05/sep/04: nondescriptive parameter names for the sake of DigitalMars
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// (and possibly MWCW < 8.0); see http://article.gmane.org/gmane.comp.lib.boost.devel/108959
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template<
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      typename BOOST_MPL_AUX_NA_PARAM(T1)
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    , typename BOOST_MPL_AUX_NA_PARAM(T2)
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    , typename BOOST_MPL_AUX_NA_PARAM(T3)
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    >
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struct if_
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{
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 private:
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    // agurt, 02/jan/03: two-step 'type' definition for the sake of aCC 
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    typedef if_c<
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#if defined(BOOST_MPL_CFG_BCC_INTEGRAL_CONSTANTS)
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          BOOST_MPL_AUX_VALUE_WKND(T1)::value
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#else
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          BOOST_MPL_AUX_STATIC_CAST(bool, BOOST_MPL_AUX_VALUE_WKND(T1)::value)
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#endif
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        , T2
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        , T3
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        > almost_type_;
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 public:
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    typedef typename almost_type_::type type;
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    BOOST_MPL_AUX_LAMBDA_SUPPORT(3,if_,(T1,T2,T3))
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};
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#else
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// no partial class template specialization
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namespace aux {
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template< bool C >
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struct if_impl
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{
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    template< typename T1, typename T2 > struct result_
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    {
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        typedef T1 type;
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    };
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};
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template<>
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struct if_impl<false>
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{
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    template< typename T1, typename T2 > struct result_
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    { 
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        typedef T2 type;
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    };
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};
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} // namespace aux
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template<
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      bool C_
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    , typename T1
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    , typename T2
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    >
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struct if_c
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{
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    typedef typename aux::if_impl< C_ >
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        ::template result_<T1,T2>::type type;
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};
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// (almost) copy & paste in order to save one more 
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// recursively nested template instantiation to user
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template<
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      typename BOOST_MPL_AUX_NA_PARAM(C_)
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    , typename BOOST_MPL_AUX_NA_PARAM(T1)
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    , typename BOOST_MPL_AUX_NA_PARAM(T2)
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    >
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struct if_
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{
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    enum { msvc_wknd_ = BOOST_MPL_AUX_MSVC_VALUE_WKND(C_)::value };
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    typedef typename aux::if_impl< BOOST_MPL_AUX_STATIC_CAST(bool, msvc_wknd_) >
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        ::template result_<T1,T2>::type type;
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    BOOST_MPL_AUX_LAMBDA_SUPPORT(3,if_,(C_,T1,T2))
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};
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#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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BOOST_MPL_AUX_NA_SPEC(3, if_)
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}}
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#endif // BOOST_MPL_IF_HPP_INCLUDED