sl@0: 
sl@0: #if !defined(BOOST_PP_IS_ITERATING)
sl@0: 
sl@0: ///// header body
sl@0: 
sl@0: #ifndef BOOST_MPL_INHERIT_HPP_INCLUDED
sl@0: #define BOOST_MPL_INHERIT_HPP_INCLUDED
sl@0: 
sl@0: // Copyright Aleksey Gurtovoy 2001-2004
sl@0: //
sl@0: // Distributed under the Boost Software License, Version 1.0. 
sl@0: // (See accompanying file LICENSE_1_0.txt or copy at 
sl@0: // http://www.boost.org/LICENSE_1_0.txt)
sl@0: //
sl@0: // See http://www.boost.org/libs/mpl for documentation.
sl@0: 
sl@0: // $Source: /cvsroot/boost/boost/boost/mpl/inherit.hpp,v $
sl@0: // $Date: 2004/09/02 15:40:41 $
sl@0: // $Revision: 1.5 $
sl@0: 
sl@0: #if !defined(BOOST_MPL_PREPROCESSING_MODE)
sl@0: #   include <boost/mpl/empty_base.hpp>
sl@0: #   include <boost/mpl/aux_/na_spec.hpp>
sl@0: #   include <boost/mpl/aux_/lambda_support.hpp>
sl@0: #endif
sl@0: 
sl@0: #include <boost/mpl/aux_/config/use_preprocessed.hpp>
sl@0: 
sl@0: #if !defined(BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS) \
sl@0:     && !defined(BOOST_MPL_PREPROCESSING_MODE)
sl@0: 
sl@0: #   define BOOST_MPL_PREPROCESSED_HEADER inherit.hpp
sl@0: #   include <boost/mpl/aux_/include_preprocessed.hpp>
sl@0: 
sl@0: #else
sl@0: 
sl@0: #   include <boost/mpl/limits/arity.hpp>
sl@0: #   include <boost/mpl/aux_/preprocessor/params.hpp>
sl@0: #   include <boost/mpl/aux_/preprocessor/default_params.hpp>
sl@0: #   include <boost/mpl/aux_/preprocessor/enum.hpp>
sl@0: #   include <boost/mpl/aux_/config/ctps.hpp>
sl@0: #   include <boost/mpl/aux_/config/dtp.hpp>
sl@0: 
sl@0: #   include <boost/preprocessor/iterate.hpp>
sl@0: #   include <boost/preprocessor/dec.hpp>
sl@0: #   include <boost/preprocessor/cat.hpp>
sl@0: 
sl@0: namespace boost { namespace mpl {
sl@0: 
sl@0: // 'inherit<T1,T2,..,Tn>' metafunction; returns an unspecified class type
sl@0: // produced by public derivation from all metafunction's parameters 
sl@0: // (T1,T2,..,Tn), except the parameters of 'empty_base' class type; 
sl@0: // regardless the position and number of 'empty_base' parameters in the 
sl@0: // metafunction's argument list, derivation from them is always a no-op;
sl@0: // for instance:
sl@0: //      inherit<her>::type == her
sl@0: //      inherit<her,my>::type == struct unspecified : her, my {};
sl@0: //      inherit<empty_base,her>::type == her
sl@0: //      inherit<empty_base,her,empty_base,empty_base>::type == her
sl@0: //      inherit<her,empty_base,my>::type == struct unspecified : her, my {};
sl@0: //      inherit<empty_base,empty_base>::type == empty_base
sl@0: 
sl@0: #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
sl@0: 
sl@0: template< 
sl@0:       typename BOOST_MPL_AUX_NA_PARAM(T1)
sl@0:     , typename BOOST_MPL_AUX_NA_PARAM(T2)
sl@0:     > 
sl@0: struct inherit2
sl@0:     : T1, T2
sl@0: {
sl@0:     typedef inherit2 type;
sl@0:     BOOST_MPL_AUX_LAMBDA_SUPPORT(2, inherit2, (T1,T2))
sl@0: };
sl@0: 
sl@0: template< typename T1 > 
sl@0: struct inherit2<T1,empty_base>
sl@0: {
sl@0:     typedef T1 type;
sl@0:     BOOST_MPL_AUX_LAMBDA_SUPPORT_SPEC(2, inherit2, (T1,empty_base))
sl@0: };
sl@0: 
sl@0: template< typename T2 > 
sl@0: struct inherit2<empty_base,T2>
sl@0: {
sl@0:     typedef T2 type;
sl@0:     BOOST_MPL_AUX_LAMBDA_SUPPORT_SPEC(2, inherit2, (empty_base,T2))
sl@0: };
sl@0: 
sl@0: // needed to disambiguate the previous two in case when both 
sl@0: // T1 and T2 == empty_base
sl@0: template<> 
sl@0: struct inherit2<empty_base,empty_base>
sl@0: {
sl@0:     typedef empty_base type;
sl@0:     BOOST_MPL_AUX_LAMBDA_SUPPORT_SPEC(2, inherit2, (empty_base,empty_base))
sl@0: };
sl@0: 
sl@0: #else
sl@0: 
sl@0: namespace aux {
sl@0: 
sl@0: template< bool C1, bool C2 >
sl@0: struct inherit2_impl
sl@0: {
sl@0:     template< typename Derived, typename T1, typename T2 > struct result_ 
sl@0:         : T1, T2
sl@0:     {
sl@0:         typedef Derived type_;
sl@0:     };
sl@0: };
sl@0: 
sl@0: template<>
sl@0: struct inherit2_impl<false,true>
sl@0: {
sl@0:     template< typename Derived, typename T1, typename T2 > struct result_
sl@0:         : T1
sl@0:     {
sl@0:         typedef T1 type_;
sl@0:     };
sl@0: };
sl@0: 
sl@0: template<>
sl@0: struct inherit2_impl<true,false>
sl@0: {
sl@0:     template< typename Derived, typename T1, typename T2 > struct result_
sl@0:         : T2 
sl@0:     {
sl@0:         typedef T2 type_;
sl@0:     };
sl@0: };
sl@0: 
sl@0: template<>
sl@0: struct inherit2_impl<true,true>
sl@0: {
sl@0:     template< typename Derived, typename T1, typename T2 > struct result_
sl@0:     {
sl@0:         typedef T1 type_;
sl@0:     };
sl@0: };
sl@0: 
sl@0: } // namespace aux
sl@0: 
sl@0: template< 
sl@0:       typename BOOST_MPL_AUX_NA_PARAM(T1)
sl@0:     , typename BOOST_MPL_AUX_NA_PARAM(T2)
sl@0:     > 
sl@0: struct inherit2
sl@0:     : aux::inherit2_impl<
sl@0:           is_empty_base<T1>::value
sl@0:         , is_empty_base<T2>::value
sl@0:         >::template result_< inherit2<T1,T2>,T1,T2 >
sl@0: {
sl@0:     typedef typename inherit2::type_ type;
sl@0:     BOOST_MPL_AUX_LAMBDA_SUPPORT(2, inherit2, (T1,T2))
sl@0: };
sl@0: 
sl@0: #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
sl@0: 
sl@0: BOOST_MPL_AUX_NA_SPEC(2, inherit2)
sl@0: 
sl@0: #define BOOST_PP_ITERATION_PARAMS_1 \
sl@0:     (3,(3, BOOST_MPL_LIMIT_METAFUNCTION_ARITY, <boost/mpl/inherit.hpp>))
sl@0: #include BOOST_PP_ITERATE()
sl@0: 
sl@0: }}
sl@0: 
sl@0: #endif // BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS
sl@0: #endif // BOOST_MPL_INHERIT_HPP_INCLUDED
sl@0: 
sl@0: ///// iteration
sl@0: 
sl@0: #else
sl@0: #define n_ BOOST_PP_FRAME_ITERATION(1)
sl@0: 
sl@0: template<
sl@0:       BOOST_MPL_PP_DEFAULT_PARAMS(n_, typename T, na)
sl@0:     >
sl@0: struct BOOST_PP_CAT(inherit,n_)
sl@0:     : inherit2<
sl@0:           typename BOOST_PP_CAT(inherit,BOOST_PP_DEC(n_))<
sl@0:               BOOST_MPL_PP_PARAMS(BOOST_PP_DEC(n_), T)
sl@0:             >::type
sl@0:         , BOOST_PP_CAT(T,n_)
sl@0:         >
sl@0: {
sl@0:     BOOST_MPL_AUX_LAMBDA_SUPPORT(
sl@0:           n_
sl@0:         , BOOST_PP_CAT(inherit,n_)
sl@0:         , (BOOST_MPL_PP_PARAMS(n_, T))
sl@0:         )
sl@0: };
sl@0: 
sl@0: BOOST_MPL_AUX_NA_SPEC(n_, BOOST_PP_CAT(inherit,n_))
sl@0: 
sl@0: #if n_ == BOOST_MPL_LIMIT_METAFUNCTION_ARITY
sl@0: /// primary template
sl@0: template<
sl@0:       BOOST_MPL_PP_DEFAULT_PARAMS(n_, typename T, empty_base)
sl@0:     >
sl@0: struct inherit
sl@0:     : BOOST_PP_CAT(inherit,n_)<BOOST_MPL_PP_PARAMS(n_, T)>
sl@0: {
sl@0: };
sl@0: 
sl@0: // 'na' specialization
sl@0: template<>
sl@0: struct inherit< BOOST_MPL_PP_ENUM(5, na) >
sl@0: {
sl@0:     template<
sl@0: #if !defined(BOOST_MPL_CFG_NO_DEFAULT_PARAMETERS_IN_NESTED_TEMPLATES)
sl@0:           BOOST_MPL_PP_DEFAULT_PARAMS(n_, typename T, empty_base)
sl@0: #else
sl@0:           BOOST_MPL_PP_PARAMS(n_, typename T)
sl@0: #endif
sl@0:         >
sl@0:     struct apply
sl@0:         : inherit< BOOST_MPL_PP_PARAMS(n_, T) >
sl@0:     {
sl@0:     };
sl@0: };
sl@0: 
sl@0: BOOST_MPL_AUX_NA_SPEC_LAMBDA(n_, inherit)
sl@0: BOOST_MPL_AUX_NA_SPEC_ARITY(n_, inherit)
sl@0: BOOST_MPL_AUX_NA_SPEC_TEMPLATE_ARITY(n_, n_, inherit)
sl@0: #endif
sl@0: 
sl@0: #undef n_
sl@0: #endif // BOOST_PP_IS_ITERATING