1// Copyright Daniel Wallin 2006.
2// Distributed under the Boost Software License, Version 1.0.
3// (See accompanying file LICENSE_1_0.txt or copy at
4// http://www.boost.org/LICENSE_1_0.txt)
5
6#ifndef BOOST_PARAMETER_AUX_PREPROCESSOR_IMPL_SPLIT_ARGS_HPP
7#define BOOST_PARAMETER_AUX_PREPROCESSOR_IMPL_SPLIT_ARGS_HPP
8
9#include <boost/preprocessor/tuple/elem.hpp>
10
11// Accessor macros for the split_args tuple.
12#define BOOST_PARAMETER_SPLIT_ARG_REQ_COUNT(x) BOOST_PP_TUPLE_ELEM(4, 0, x)
13#define BOOST_PARAMETER_SPLIT_ARG_REQ_SEQ(x) BOOST_PP_TUPLE_ELEM(4, 1, x)
14#define BOOST_PARAMETER_SPLIT_ARG_OPT_COUNT(x) BOOST_PP_TUPLE_ELEM(4, 2, x)
15#define BOOST_PARAMETER_SPLIT_ARG_OPT_SEQ(x) BOOST_PP_TUPLE_ELEM(4, 3, x)
16
17#include <boost/preprocessor/arithmetic/inc.hpp>
18#include <boost/preprocessor/seq/push_back.hpp>
19
20// Helper macros for BOOST_PARAMETER_FUNCTION_SPLIT_ARGS.
21#define BOOST_PARAMETER_FUNCTION_SPLIT_ARG_required(s_a, arg) \
22 ( \
23 BOOST_PP_INC(BOOST_PARAMETER_SPLIT_ARG_REQ_COUNT(s_a)) \
24 , BOOST_PP_SEQ_PUSH_BACK(BOOST_PARAMETER_SPLIT_ARG_REQ_SEQ(s_a), arg) \
25 , BOOST_PARAMETER_SPLIT_ARG_OPT_COUNT(s_a) \
26 , BOOST_PARAMETER_SPLIT_ARG_OPT_SEQ(s_a) \
27 )
28/**/
29
30#define BOOST_PARAMETER_FUNCTION_SPLIT_ARG_deduced_required(split_args, arg) \
31 BOOST_PARAMETER_FUNCTION_SPLIT_ARG_required(split_args, arg)
32/**/
33
34#define BOOST_PARAMETER_FUNCTION_SPLIT_ARG_optional(s_a, arg) \
35 ( \
36 BOOST_PARAMETER_SPLIT_ARG_REQ_COUNT(s_a) \
37 , BOOST_PARAMETER_SPLIT_ARG_REQ_SEQ(s_a) \
38 , BOOST_PP_INC(BOOST_PARAMETER_SPLIT_ARG_OPT_COUNT(s_a)) \
39 , BOOST_PP_SEQ_PUSH_BACK(BOOST_PARAMETER_SPLIT_ARG_OPT_SEQ(s_a), arg) \
40 )
41/**/
42
43#define BOOST_PARAMETER_FUNCTION_SPLIT_ARG_deduced_optional(split_args, arg) \
44 BOOST_PARAMETER_FUNCTION_SPLIT_ARG_optional(split_args, arg)
45/**/
46
47#include <boost/parameter/aux_/preprocessor/impl/argument_specs.hpp>
48#include <boost/preprocessor/cat.hpp>
49
50#define BOOST_PARAMETER_FUNCTION_SPLIT_ARG(s, split_args, arg) \
51 BOOST_PP_CAT( \
52 BOOST_PARAMETER_FUNCTION_SPLIT_ARG_ \
53 , BOOST_PARAMETER_FN_ARG_QUALIFIER(arg) \
54 )(split_args, arg)
55/**/
56
57#include <boost/preprocessor/seq/fold_left.hpp>
58#include <boost/preprocessor/seq/seq.hpp>
59
60// Expands from the flattened BOOST_PARAMETER_FUNCTION et. al. arg sequence to
61// the tuple (required_count, required_args, optional_count, optional_args).
62#define BOOST_PARAMETER_FUNCTION_SPLIT_ARGS(args) \
63 BOOST_PP_SEQ_FOLD_LEFT( \
64 BOOST_PARAMETER_FUNCTION_SPLIT_ARG \
65 , (0, BOOST_PP_SEQ_NIL, 0, BOOST_PP_SEQ_NIL) \
66 , args \
67 )
68/**/
69
70#endif // include guard
71
72

source code of boost/libs/parameter/include/boost/parameter/aux_/preprocessor/impl/split_args.hpp