190 lines
4.7 KiB
C++
190 lines
4.7 KiB
C++
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#if !defined(BOOST_PP_IS_ITERATING)
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///// header body
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#ifndef BOOST_MPL_AUX_TEMPLATE_ARITY_HPP_INCLUDED
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#define BOOST_MPL_AUX_TEMPLATE_ARITY_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: template_arity.hpp 61584 2010-04-26 18:48:26Z agurtovoy $
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// $Date: 2010-04-26 14:48:26 -0400 (Mon, 26 Apr 2010) $
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// $Revision: 61584 $
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#include <boost/mpl/aux_/config/ttp.hpp>
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#include <boost/mpl/aux_/config/lambda.hpp>
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#if !defined(BOOST_MPL_PREPROCESSING_MODE)
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# include <boost/mpl/aux_/template_arity_fwd.hpp>
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# include <boost/mpl/int.hpp>
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# if !defined(BOOST_MPL_CFG_NO_FULL_LAMBDA_SUPPORT)
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# if defined(BOOST_MPL_CFG_EXTENDED_TEMPLATE_PARAMETERS_MATCHING)
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# include <boost/mpl/aux_/type_wrapper.hpp>
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# endif
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# else
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# include <boost/mpl/aux_/has_rebind.hpp>
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# endif
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#endif
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#include <boost/mpl/aux_/config/static_constant.hpp>
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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 template_arity.hpp
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# include <boost/mpl/aux_/include_preprocessed.hpp>
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#else
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# if !defined(BOOST_MPL_CFG_NO_FULL_LAMBDA_SUPPORT)
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# if defined(BOOST_MPL_CFG_EXTENDED_TEMPLATE_PARAMETERS_MATCHING)
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# include <boost/mpl/limits/arity.hpp>
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# include <boost/mpl/aux_/preprocessor/range.hpp>
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# include <boost/mpl/aux_/preprocessor/repeat.hpp>
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# include <boost/mpl/aux_/preprocessor/params.hpp>
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# include <boost/mpl/aux_/nttp_decl.hpp>
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# include <boost/preprocessor/seq/fold_left.hpp>
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# include <boost/preprocessor/comma_if.hpp>
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# include <boost/preprocessor/iterate.hpp>
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# include <boost/preprocessor/inc.hpp>
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# include <boost/preprocessor/cat.hpp>
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# define AUX778076_ARITY BOOST_PP_INC(BOOST_MPL_LIMIT_METAFUNCTION_ARITY)
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namespace boost { namespace mpl { namespace aux {
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template< BOOST_MPL_AUX_NTTP_DECL(int, N) > struct arity_tag
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{
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typedef char (&type)[N + 1];
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};
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# define AUX778076_MAX_ARITY_OP(unused, state, i_) \
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( BOOST_PP_CAT(C,i_) > 0 ? BOOST_PP_CAT(C,i_) : state ) \
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/**/
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template<
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BOOST_MPL_PP_PARAMS(AUX778076_ARITY, BOOST_MPL_AUX_NTTP_DECL(int, C))
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>
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struct max_arity
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{
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BOOST_STATIC_CONSTANT(int, value =
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BOOST_PP_SEQ_FOLD_LEFT(
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AUX778076_MAX_ARITY_OP
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, -1
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, BOOST_MPL_PP_RANGE(1, AUX778076_ARITY)
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)
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);
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};
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# undef AUX778076_MAX_ARITY_OP
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arity_tag<0>::type arity_helper(...);
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# define BOOST_PP_ITERATION_LIMITS (1, AUX778076_ARITY)
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# define BOOST_PP_FILENAME_1 <boost/mpl/aux_/template_arity.hpp>
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# include BOOST_PP_ITERATE()
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template< typename F, BOOST_MPL_AUX_NTTP_DECL(int, N) >
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struct template_arity_impl
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{
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BOOST_STATIC_CONSTANT(int, value =
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sizeof(::boost::mpl::aux::arity_helper(type_wrapper<F>(),arity_tag<N>())) - 1
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);
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};
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# define AUX778076_TEMPLATE_ARITY_IMPL_INVOCATION(unused, i_, F) \
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BOOST_PP_COMMA_IF(i_) template_arity_impl<F,BOOST_PP_INC(i_)>::value \
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/**/
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template< typename F >
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struct template_arity
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{
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BOOST_STATIC_CONSTANT(int, value = (
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max_arity< BOOST_MPL_PP_REPEAT(
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AUX778076_ARITY
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, AUX778076_TEMPLATE_ARITY_IMPL_INVOCATION
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, F
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) >::value
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));
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typedef mpl::int_<value> type;
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};
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# undef AUX778076_TEMPLATE_ARITY_IMPL_INVOCATION
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# undef AUX778076_ARITY
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}}}
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# endif // BOOST_MPL_CFG_EXTENDED_TEMPLATE_PARAMETERS_MATCHING
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# else // BOOST_MPL_CFG_NO_FULL_LAMBDA_SUPPORT
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# include <boost/mpl/aux_/config/eti.hpp>
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namespace boost { namespace mpl { namespace aux {
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template< bool >
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struct template_arity_impl
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{
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template< typename F > struct result_
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: mpl::int_<-1>
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{
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};
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};
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template<>
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struct template_arity_impl<true>
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{
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template< typename F > struct result_
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: F::arity
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{
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};
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};
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template< typename F >
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struct template_arity
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: template_arity_impl< ::boost::mpl::aux::has_rebind<F>::value >
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::template result_<F>
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{
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};
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#if defined(BOOST_MPL_CFG_MSVC_ETI_BUG)
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template<>
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struct template_arity<int>
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: mpl::int_<-1>
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{
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};
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#endif
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}}}
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# endif // BOOST_MPL_CFG_NO_FULL_LAMBDA_SUPPORT
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#endif // BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS
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#endif // BOOST_MPL_AUX_TEMPLATE_ARITY_HPP_INCLUDED
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///// iteration
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#else
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#define i_ BOOST_PP_FRAME_ITERATION(1)
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template<
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template< BOOST_MPL_PP_PARAMS(i_, typename P) > class F
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, BOOST_MPL_PP_PARAMS(i_, typename T)
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>
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typename arity_tag<i_>::type
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arity_helper(type_wrapper< F<BOOST_MPL_PP_PARAMS(i_, T)> >, arity_tag<i_>);
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#undef i_
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#endif // BOOST_PP_IS_ITERATING
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