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) */
11#
12# /* See http://www.boost.org for most recent version. */
13#
14# ifndef BOOST_PREPROCESSOR_LIST_SIZE_HPP
15# define BOOST_PREPROCESSOR_LIST_SIZE_HPP
16#
17# include <boost/preprocessor/arithmetic/inc.hpp>
18# include <boost/preprocessor/config/config.hpp>
19# include <boost/preprocessor/control/while.hpp>
20# include <boost/preprocessor/list/adt.hpp>
21# include <boost/preprocessor/tuple/elem.hpp>
22# include <boost/preprocessor/tuple/rem.hpp>
23#
24# /* BOOST_PP_LIST_SIZE */
25#
26# if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
27# define BOOST_PP_LIST_SIZE(list) BOOST_PP_TUPLE_ELEM(2, 0, BOOST_PP_WHILE(BOOST_PP_LIST_SIZE_P, BOOST_PP_LIST_SIZE_O, (0, list)))
28# else
29# define BOOST_PP_LIST_SIZE(list) BOOST_PP_LIST_SIZE_I(list)
30# define BOOST_PP_LIST_SIZE_I(list) BOOST_PP_TUPLE_ELEM(2, 0, BOOST_PP_WHILE(BOOST_PP_LIST_SIZE_P, BOOST_PP_LIST_SIZE_O, (0, list)))
31# endif
32#
33# if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
34# define BOOST_PP_LIST_SIZE_P(d, rl) BOOST_PP_LIST_IS_CONS(BOOST_PP_TUPLE_ELEM(2, 1, rl))
35# else
36# define BOOST_PP_LIST_SIZE_P(d, rl) BOOST_PP_LIST_SIZE_P_I(BOOST_PP_TUPLE_REM_2 rl)
37# define BOOST_PP_LIST_SIZE_P_I(im) BOOST_PP_LIST_SIZE_P_II(im)
38# define BOOST_PP_LIST_SIZE_P_II(r, l) BOOST_PP_LIST_IS_CONS(l)
39# endif
40#
41# if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
42# define BOOST_PP_LIST_SIZE_O(d, rl) (BOOST_PP_INC(BOOST_PP_TUPLE_ELEM(2, 0, rl)), BOOST_PP_LIST_REST(BOOST_PP_TUPLE_ELEM(2, 1, rl)))
43# else
44# define BOOST_PP_LIST_SIZE_O(d, rl) BOOST_PP_LIST_SIZE_O_I(BOOST_PP_TUPLE_REM_2 rl)
45# define BOOST_PP_LIST_SIZE_O_I(im) BOOST_PP_LIST_SIZE_O_II(im)
46# define BOOST_PP_LIST_SIZE_O_II(r, l) (BOOST_PP_INC(r), BOOST_PP_LIST_REST(l))
47# endif
48#
49# /* BOOST_PP_LIST_SIZE_D */
50#
51# if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
52# define BOOST_PP_LIST_SIZE_D(d, list) BOOST_PP_TUPLE_ELEM(2, 0, BOOST_PP_WHILE_ ## d(BOOST_PP_LIST_SIZE_P, BOOST_PP_LIST_SIZE_O, (0, list)))
53# else
54# define BOOST_PP_LIST_SIZE_D(d, list) BOOST_PP_LIST_SIZE_D_I(d, list)
55# define BOOST_PP_LIST_SIZE_D_I(d, list) BOOST_PP_TUPLE_ELEM(2, 0, BOOST_PP_WHILE_ ## d(BOOST_PP_LIST_SIZE_P, BOOST_PP_LIST_SIZE_O, (0, list)))
56# endif
57#
58# endif
59

source code of boost/boost/preprocessor/list/size.hpp