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1 | # /* Copyright (C) 2001 |
2 | # * Housemarque Oy | |
3 | # * http://www.housemarque.com | |
4 | # * | |
5 | # * Distributed under the Boost Software License, Version 1.0. (See | |
6 | # * accompanying file LICENSE_1_0.txt or copy at | |
7 | # * http://www.boost.org/LICENSE_1_0.txt) | |
8 | # */ | |
9 | # | |
10 | # /* Revised by Paul Mensonides (2002-2011) */ | |
20effc67 | 11 | # /* Revised by Edward Diener (2011,2014,2020) */ |
7c673cae FG |
12 | # |
13 | # /* See http://www.boost.org for most recent version. */ | |
14 | # | |
15 | # ifndef BOOST_PREPROCESSOR_TUPLE_ELEM_HPP | |
16 | # define BOOST_PREPROCESSOR_TUPLE_ELEM_HPP | |
17 | # | |
18 | # include <boost/preprocessor/cat.hpp> | |
19 | # include <boost/preprocessor/config/config.hpp> | |
20 | # include <boost/preprocessor/facilities/expand.hpp> | |
21 | # include <boost/preprocessor/facilities/overload.hpp> | |
22 | # include <boost/preprocessor/tuple/rem.hpp> | |
23 | # include <boost/preprocessor/variadic/elem.hpp> | |
24 | # include <boost/preprocessor/tuple/detail/is_single_return.hpp> | |
25 | # | |
20effc67 TL |
26 | # if BOOST_PP_VARIADICS_MSVC |
27 | # define BOOST_PP_TUPLE_ELEM(...) BOOST_PP_TUPLE_ELEM_I(BOOST_PP_OVERLOAD(BOOST_PP_TUPLE_ELEM_O_, __VA_ARGS__), (__VA_ARGS__)) | |
28 | # define BOOST_PP_TUPLE_ELEM_I(m, args) BOOST_PP_TUPLE_ELEM_II(m, args) | |
29 | # define BOOST_PP_TUPLE_ELEM_II(m, args) BOOST_PP_CAT(m ## args,) | |
7c673cae FG |
30 | /* |
31 | Use BOOST_PP_REM_CAT if it is a single element tuple ( which might be empty ) | |
32 | else use BOOST_PP_REM. This fixes a VC++ problem with an empty tuple and BOOST_PP_TUPLE_ELEM | |
33 | functionality. See tuple_elem_bug_test.cxx. | |
34 | */ | |
20effc67 TL |
35 | # define BOOST_PP_TUPLE_ELEM_O_2(n, tuple) \ |
36 | BOOST_PP_VARIADIC_ELEM(n, BOOST_PP_EXPAND(BOOST_PP_TUPLE_IS_SINGLE_RETURN(BOOST_PP_REM_CAT,BOOST_PP_REM,tuple) tuple)) \ | |
37 | /**/ | |
7c673cae | 38 | # else |
20effc67 TL |
39 | # define BOOST_PP_TUPLE_ELEM(...) BOOST_PP_OVERLOAD(BOOST_PP_TUPLE_ELEM_O_, __VA_ARGS__)(__VA_ARGS__) |
40 | # define BOOST_PP_TUPLE_ELEM_O_2(n, tuple) BOOST_PP_VARIADIC_ELEM(n, BOOST_PP_REM tuple) | |
7c673cae | 41 | # endif |
20effc67 | 42 | # define BOOST_PP_TUPLE_ELEM_O_3(size, n, tuple) BOOST_PP_TUPLE_ELEM_O_2(n, tuple) |
7c673cae FG |
43 | # |
44 | # /* directly used elsewhere in Boost... */ | |
45 | # | |
46 | # define BOOST_PP_TUPLE_ELEM_1_0(a) a | |
47 | # | |
48 | # define BOOST_PP_TUPLE_ELEM_2_0(a, b) a | |
49 | # define BOOST_PP_TUPLE_ELEM_2_1(a, b) b | |
50 | # | |
51 | # define BOOST_PP_TUPLE_ELEM_3_0(a, b, c) a | |
52 | # define BOOST_PP_TUPLE_ELEM_3_1(a, b, c) b | |
53 | # define BOOST_PP_TUPLE_ELEM_3_2(a, b, c) c | |
54 | # | |
55 | # endif |