preprocessor/impl/arity_range.hpp

0001 // Copyright Daniel Wallin 2006.
0002 // Distributed under the Boost Software License, Version 1.0.
0003 // (See accompanying file LICENSE_1_0.txt or copy at
0004 // http://www.boost.org/LICENSE_1_0.txt)
0005
0006 #ifndef BOOST_PARAMETER_AUX_PREPROCESSOR_IMPL_ARITY_RANGE_HPP
0007 #define BOOST_PARAMETER_AUX_PREPROCESSOR_IMPL_ARITY_RANGE_HPP
0008
0009 // Helper macros for BOOST_PARAMETER_ARITY_RANGE.
0010 #define BOOST_PARAMETER_ARITY_RANGE_M_optional(state) state
0011 #define BOOST_PARAMETER_ARITY_RANGE_M_deduced_optional(state) state
0012
0013 #include <boost/preprocessor/arithmetic/inc.hpp>
0014
0015 #define BOOST_PARAMETER_ARITY_RANGE_M_required(state) BOOST_PP_INC(state)
0016 #define BOOST_PARAMETER_ARITY_RANGE_M_deduced_required(state)                \
0017     BOOST_PP_INC(state)
0018 /**/
0019
0020 #include <boost/parameter/aux_/preprocessor/impl/argument_specs.hpp>
0021 #include <boost/preprocessor/cat.hpp>
0022
0023 #define BOOST_PARAMETER_ARITY_RANGE_M(s, state, x)                           \
0024     BOOST_PP_CAT(                                                            \
0025         BOOST_PARAMETER_ARITY_RANGE_M_                                       \
0026       , BOOST_PARAMETER_FN_ARG_QUALIFIER(x)                                  \
0027     )(state)
0028 /**/
0029
0030 #include <boost/preprocessor/seq/fold_left.hpp>
0031 #include <boost/preprocessor/seq/size.hpp>
0032
0033 // Calculates [begin, end) arity range.
0034 #define BOOST_PARAMETER_ARITY_RANGE(args)                                    \
0035     (                                                                        \
0036         BOOST_PP_SEQ_FOLD_LEFT(BOOST_PARAMETER_ARITY_RANGE_M, 0, args)       \
0037       , BOOST_PP_INC(BOOST_PP_SEQ_SIZE(args))                                \
0038     )
0039 /**/
0040
0041 #endif  // include guard
0042