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189 lines
4.7 KiB
189 lines
4.7 KiB
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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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