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_ARITY_RANGE_HPP
7#define BOOST_PARAMETER_AUX_PREPROCESSOR_IMPL_ARITY_RANGE_HPP
8
9// Helper macros for BOOST_PARAMETER_ARITY_RANGE.
10#define BOOST_PARAMETER_ARITY_RANGE_M_optional(state) state
11#define BOOST_PARAMETER_ARITY_RANGE_M_deduced_optional(state) state
12
13#include <boost/preprocessor/arithmetic/inc.hpp>
14
15#define BOOST_PARAMETER_ARITY_RANGE_M_required(state) BOOST_PP_INC(state)
16#define BOOST_PARAMETER_ARITY_RANGE_M_deduced_required(state) \
17 BOOST_PP_INC(state)
18/**/
19
20#include <boost/parameter/aux_/preprocessor/impl/argument_specs.hpp>
21#include <boost/preprocessor/cat.hpp>
22
23#define BOOST_PARAMETER_ARITY_RANGE_M(s, state, x) \
24 BOOST_PP_CAT( \
25 BOOST_PARAMETER_ARITY_RANGE_M_ \
26 , BOOST_PARAMETER_FN_ARG_QUALIFIER(x) \
27 )(state)
28/**/
29
30#include <boost/preprocessor/seq/fold_left.hpp>
31#include <boost/preprocessor/seq/size.hpp>
32
33// Calculates [begin, end) arity range.
34#define BOOST_PARAMETER_ARITY_RANGE(args) \
35 ( \
36 BOOST_PP_SEQ_FOLD_LEFT(BOOST_PARAMETER_ARITY_RANGE_M, 0, args) \
37 , BOOST_PP_INC(BOOST_PP_SEQ_SIZE(args)) \
38 )
39/**/
40
41#endif // include guard
42
43

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