230 lines
5.8 KiB
Plaintext
230 lines
5.8 KiB
Plaintext
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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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// $Id$
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// $Date$
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// $Revision$
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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
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