forked from boostorg/mpl
139 lines
3.5 KiB
C++
139 lines
3.5 KiB
C++
//-----------------------------------------------------------------------------
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// boost mpl/arg.hpp header file
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// See http://www.boost.org for updates, documentation, and revision history.
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//-----------------------------------------------------------------------------
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//
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// Copyright (c) 2001-02
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// Peter Dimov, Aleksey Gurtovoy
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//
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// Permission to use, copy, modify, distribute and sell this software
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// and its documentation for any purpose is hereby granted without fee,
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// provided that the above copyright notice appears in all copies and
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// that both the copyright notice and this permission notice appear in
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// supporting documentation. No representations are made about the
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// suitability of this software for any purpose. It is provided "as is"
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// without express or implied warranty.
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#if !defined(BOOST_PP_IS_ITERATING)
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///// header body
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#ifndef BOOST_MPL_ARG_HPP_INCLUDED
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#define BOOST_MPL_ARG_HPP_INCLUDED
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#if !defined(BOOST_MPL_PREPROCESSING_MODE)
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# include "boost/mpl/arg_fwd.hpp"
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# include "boost/mpl/void.hpp"
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# include "boost/mpl/aux_/arity.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_USE_PREPROCESSED_HEADERS) && \
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!defined(BOOST_MPL_PREPROCESSING_MODE)
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# define BOOST_MPL_PREPROCESSED_HEADER arg.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/default_params.hpp"
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# include "boost/mpl/aux_/preprocessor/params.hpp"
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# include "boost/mpl/aux_/config/lambda_support.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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# include "boost/config.hpp"
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namespace boost {
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namespace mpl {
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// local macro, #undef-ined at the end of the header
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# define AUX_ARG_N_DEFAULT_PARAMS(param,value) \
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BOOST_MPL_PP_DEFAULT_PARAMS( \
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BOOST_MPL_METAFUNCTION_MAX_ARITY \
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, param \
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, value \
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) \
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/**/
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#define BOOST_PP_ITERATION_PARAMS_1 \
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(3,(0, BOOST_MPL_METAFUNCTION_MAX_ARITY, "boost/mpl/arg.hpp"))
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#include BOOST_PP_ITERATE()
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# undef AUX_ARG_N_DEFAULT_PARAMS
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#if defined(BOOST_NO_DEFAULT_TEMPLATE_PARAMETERS_IN_NESTED_TEMPLATES)
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// MWCW/Borland workaround
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namespace aux {
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template< int N, int A >
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struct arity< arg<N>, A >
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{
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BOOST_STATIC_CONSTANT(int
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, value = BOOST_MPL_METAFUNCTION_MAX_ARITY
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);
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};
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}
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#endif
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} // namespace mpl
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} // namespace boost
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#endif // BOOST_MPL_USE_PREPROCESSED_HEADERS
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#endif // BOOST_MPL_ARG_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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#if i > 0
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template<> struct arg<i>
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{
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BOOST_STATIC_CONSTANT(int, value = i);
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typedef arg<BOOST_PP_INC(i)> next;
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#if defined(BOOST_MPL_NO_FULL_LAMBDA_SUPPORT)
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typedef void_ tag;
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#endif
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template<
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AUX_ARG_N_DEFAULT_PARAMS(typename U, void_)
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>
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struct apply
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{
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typedef BOOST_PP_CAT(U,i) type;
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typedef char arity_constraint[
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::boost::mpl::aux::reject_if_void_<type>::value
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];
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};
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};
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#else
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template<> struct arg<-1>
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{
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BOOST_STATIC_CONSTANT(int, value = -1);
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#if defined(BOOST_MPL_NO_FULL_LAMBDA_SUPPORT)
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typedef void_ tag;
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#endif
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template<
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AUX_ARG_N_DEFAULT_PARAMS(typename U, void_)
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>
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struct apply
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{
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typedef U1 type;
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typedef char arity_constraint[
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::boost::mpl::aux::reject_if_void_<type>::value
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];
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};
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};
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#endif // i > 0
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#undef i
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#endif // BOOST_PP_IS_ITERATING
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