1 // Boost.Range library
2 //
3 //  Copyright Neil Groves 2014. Use, modification and
4 //  distribution is subject to the Boost Software License, Version
5 //  1.0. (See accompanying file LICENSE_1_0.txt or copy at
6 //  http://www.boost.org/LICENSE_1_0.txt)
7 //
8 // For more information, see http://www.boost.org/libs/range/
9 //
10 #define BOOST_RANGE_combined_exp_pred(d, data) BOOST_PP_TUPLE_ELEM(3, 0, data)
11 
12 #define BOOST_RANGE_combined_exp_op(d, data) \
13  ( \
14     BOOST_PP_DEC( \
15        BOOST_PP_TUPLE_ELEM(3, 0, data) \
16     ), \
17     BOOST_PP_TUPLE_ELEM(3, 1, data), \
18     BOOST_PP_MUL_D( \
19        d, \
20        BOOST_PP_TUPLE_ELEM(3, 2, data), \
21        BOOST_PP_TUPLE_ELEM(3, 1, data) \
22     ) \
23  )
24 
25 #define BOOST_RANGE_combined_exp(x, n) \
26   BOOST_PP_TUPLE_ELEM(3, 2, \
27   BOOST_PP_WHILE(BOOST_RANGE_combined_exp_pred, \
28                  BOOST_RANGE_combined_exp_op, (n, x, 1)))
29 
30 #define BOOST_RANGE_combined_bitset_pred(n, state) \
31     BOOST_PP_TUPLE_ELEM(2,1,state)
32 
33 #define BOOST_RANGE_combined_bitset_op(d, state) \
34     (BOOST_PP_DIV_D(d, BOOST_PP_TUPLE_ELEM(2,0,state), 2), \
35      BOOST_PP_DEC(BOOST_PP_TUPLE_ELEM(2,1,state)))
36 
37 #define BOOST_RANGE_combined_bitset(i, n) \
38 BOOST_PP_MOD(BOOST_PP_TUPLE_ELEM(2, 0, \
39       BOOST_PP_WHILE(BOOST_RANGE_combined_bitset_pred, \
40                      BOOST_RANGE_combined_bitset_op, (i,n))), 2)
41 
42 #define BOOST_RANGE_combined_range_iterator(z, n, i) \
43   typename range_iterator< \
44       BOOST_PP_CAT(R,n)          \
45       BOOST_PP_IF( \
46           BOOST_RANGE_combined_bitset(i,n), \
47           BOOST_PP_IDENTITY(const), \
48           BOOST_PP_EMPTY)() \
49   >::type
50 
51 #define BOOST_RANGE_combined_args(z, n, i) \
52   BOOST_PP_CAT(R, n) \
53   BOOST_PP_IF(BOOST_RANGE_combined_bitset(i,n), const&, &)  \
54   BOOST_PP_CAT(r, n)
55 
56 #define BOOST_RANGE_combine_impl(z, i, n)\
57     template<BOOST_PP_ENUM_PARAMS(n, typename R)> \
58     inline range::combined_range< \
59         boost::tuple<BOOST_PP_ENUM(n, BOOST_RANGE_combined_range_iterator, i)> \
60     > \
61     combine(BOOST_PP_ENUM(n, BOOST_RANGE_combined_args, i)) \
62     { \
63         typedef tuple< \
64             BOOST_PP_ENUM(n, BOOST_RANGE_combined_range_iterator, i) \
65         > rng_tuple_t;   \
66         return range::combined_range<rng_tuple_t>( \
67             rng_tuple_t(BOOST_PP_ENUM(n, BOOST_RANGE_combined_seq, begin)), \
68             rng_tuple_t(BOOST_PP_ENUM(n, BOOST_RANGE_combined_seq, end))); \
69     }
70 
71 
72 #define BOOST_RANGE_combine(z, n, data) \
73   BOOST_PP_REPEAT(BOOST_RANGE_combined_exp(2,n), BOOST_RANGE_combine_impl, n)
74