imgtools/imglib/boostlibrary/boost/mpl/inherit.hpp
author tnmurphy@4GBL06592.nokia.com
Sat, 21 Nov 2009 00:36:02 +0000
branchwip
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Parallel-parsing "noexport" flag.
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#if !defined(BOOST_PP_IS_ITERATING)
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///// header body
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#ifndef BOOST_MPL_INHERIT_HPP_INCLUDED
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#define BOOST_MPL_INHERIT_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: inherit.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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#if !defined(BOOST_MPL_PREPROCESSING_MODE)
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#   include <boost/mpl/empty_base.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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#endif
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#include <boost/mpl/aux_/config/use_preprocessed.hpp>
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#if !defined(BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS) \
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    && !defined(BOOST_MPL_PREPROCESSING_MODE)
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#   define BOOST_MPL_PREPROCESSED_HEADER inherit.hpp
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#   include <boost/mpl/aux_/include_preprocessed.hpp>
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#else
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#   include <boost/mpl/limits/arity.hpp>
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#   include <boost/mpl/aux_/preprocessor/params.hpp>
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#   include <boost/mpl/aux_/preprocessor/default_params.hpp>
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#   include <boost/mpl/aux_/preprocessor/enum.hpp>
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#   include <boost/mpl/aux_/config/ctps.hpp>
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#   include <boost/mpl/aux_/config/dtp.hpp>
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#   include <boost/preprocessor/iterate.hpp>
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#   include <boost/preprocessor/dec.hpp>
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#   include <boost/preprocessor/cat.hpp>
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namespace boost { namespace mpl {
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// 'inherit<T1,T2,..,Tn>' metafunction; returns an unspecified class type
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// produced by public derivation from all metafunction's parameters 
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// (T1,T2,..,Tn), except the parameters of 'empty_base' class type; 
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// regardless the position and number of 'empty_base' parameters in the 
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// metafunction's argument list, derivation from them is always a no-op;
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// for instance:
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//      inherit<her>::type == her
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//      inherit<her,my>::type == struct unspecified : her, my {};
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//      inherit<empty_base,her>::type == her
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//      inherit<empty_base,her,empty_base,empty_base>::type == her
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//      inherit<her,empty_base,my>::type == struct unspecified : her, my {};
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//      inherit<empty_base,empty_base>::type == empty_base
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#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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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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    > 
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struct inherit2
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    : T1, T2
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{
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    typedef inherit2 type;
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    BOOST_MPL_AUX_LAMBDA_SUPPORT(2, inherit2, (T1,T2))
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};
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template< typename T1 > 
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struct inherit2<T1,empty_base>
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{
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    typedef T1 type;
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    BOOST_MPL_AUX_LAMBDA_SUPPORT_SPEC(2, inherit2, (T1,empty_base))
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};
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template< typename T2 > 
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struct inherit2<empty_base,T2>
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{
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    typedef T2 type;
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    BOOST_MPL_AUX_LAMBDA_SUPPORT_SPEC(2, inherit2, (empty_base,T2))
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};
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// needed to disambiguate the previous two in case when both 
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// T1 and T2 == empty_base
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template<> 
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struct inherit2<empty_base,empty_base>
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{
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    typedef empty_base type;
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    BOOST_MPL_AUX_LAMBDA_SUPPORT_SPEC(2, inherit2, (empty_base,empty_base))
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};
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#else
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namespace aux {
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template< bool C1, bool C2 >
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struct inherit2_impl
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{
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    template< typename Derived, typename T1, typename T2 > struct result_ 
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        : T1, T2
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    {
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        typedef Derived type_;
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    };
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};
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template<>
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struct inherit2_impl<false,true>
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{
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    template< typename Derived, typename T1, typename T2 > struct result_
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        : T1
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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 inherit2_impl<true,false>
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{
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    template< typename Derived, typename T1, typename T2 > struct result_
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        : T2 
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    {
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        typedef T2 type_;
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    };
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};
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template<>
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struct inherit2_impl<true,true>
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{
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    template< typename Derived, 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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} // namespace aux
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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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    > 
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struct inherit2
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    : aux::inherit2_impl<
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          is_empty_base<T1>::value
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        , is_empty_base<T2>::value
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        >::template result_< inherit2<T1,T2>,T1,T2 >
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{
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    typedef typename inherit2::type_ type;
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    BOOST_MPL_AUX_LAMBDA_SUPPORT(2, inherit2, (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(2, inherit2)
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#define BOOST_PP_ITERATION_PARAMS_1 \
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    (3,(3, BOOST_MPL_LIMIT_METAFUNCTION_ARITY, <boost/mpl/inherit.hpp>))
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#include BOOST_PP_ITERATE()
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}}
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#endif // BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS
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#endif // BOOST_MPL_INHERIT_HPP_INCLUDED
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///// iteration
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#else
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#define n_ BOOST_PP_FRAME_ITERATION(1)
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template<
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      BOOST_MPL_PP_DEFAULT_PARAMS(n_, typename T, na)
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    >
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struct BOOST_PP_CAT(inherit,n_)
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    : inherit2<
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          typename BOOST_PP_CAT(inherit,BOOST_PP_DEC(n_))<
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              BOOST_MPL_PP_PARAMS(BOOST_PP_DEC(n_), T)
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            >::type
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        , BOOST_PP_CAT(T,n_)
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        >
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{
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    BOOST_MPL_AUX_LAMBDA_SUPPORT(
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          n_
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        , BOOST_PP_CAT(inherit,n_)
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        , (BOOST_MPL_PP_PARAMS(n_, T))
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        )
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};
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BOOST_MPL_AUX_NA_SPEC(n_, BOOST_PP_CAT(inherit,n_))
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#if n_ == BOOST_MPL_LIMIT_METAFUNCTION_ARITY
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/// primary template
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template<
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      BOOST_MPL_PP_DEFAULT_PARAMS(n_, typename T, empty_base)
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    >
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struct inherit
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    : BOOST_PP_CAT(inherit,n_)<BOOST_MPL_PP_PARAMS(n_, T)>
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{
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};
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// 'na' specialization
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template<>
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struct inherit< BOOST_MPL_PP_ENUM(5, na) >
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{
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    template<
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#if !defined(BOOST_MPL_CFG_NO_DEFAULT_PARAMETERS_IN_NESTED_TEMPLATES)
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          BOOST_MPL_PP_DEFAULT_PARAMS(n_, typename T, empty_base)
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#else
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          BOOST_MPL_PP_PARAMS(n_, typename T)
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#endif
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        >
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    struct apply
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        : inherit< BOOST_MPL_PP_PARAMS(n_, T) >
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    {
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    };
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};
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BOOST_MPL_AUX_NA_SPEC_LAMBDA(n_, inherit)
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BOOST_MPL_AUX_NA_SPEC_ARITY(n_, inherit)
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BOOST_MPL_AUX_NA_SPEC_TEMPLATE_ARITY(n_, n_, inherit)
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#endif
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#undef n_
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#endif // BOOST_PP_IS_ITERATING