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2 | // Copyright Oliver Kowalke 2014. | |
3 | // Distributed under the Boost Software License, Version 1.0. | |
4 | // (See accompanying file LICENSE_1_0.txt or copy at | |
5 | // http://www.boost.org/LICENSE_1_0.txt) | |
6 | ||
7 | #ifndef BOOST_CONTEXT_DETAIL_INDEX_SEQUENCE_H | |
8 | #define BOOST_CONTEXT_DETAIL_INDEX_SEQUENCE_H | |
9 | ||
10 | #include <cstddef> | |
11 | ||
12 | #include <boost/config.hpp> | |
13 | ||
14 | #include <boost/context/detail/config.hpp> | |
15 | ||
16 | #ifdef BOOST_HAS_ABI_HEADERS | |
17 | # include BOOST_ABI_PREFIX | |
18 | #endif | |
19 | ||
20 | namespace boost { | |
21 | namespace context { | |
22 | namespace detail { | |
23 | ||
24 | #if ! defined(BOOST_CONTEXT_NO_CXX14_INTEGER_SEQUENCE) | |
25 | template< std::size_t ... I > | |
26 | using index_sequence = std::index_sequence< I ... >; | |
27 | template< std::size_t I > | |
28 | using make_index_sequence = std::make_index_sequence< I >; | |
29 | template< typename ... T > | |
30 | using index_sequence_for = std::index_sequence_for< T ... >; | |
31 | #else | |
32 | //http://stackoverflow.com/questions/17424477/implementation-c14-make-integer-sequence | |
33 | ||
34 | template< std::size_t ... I > | |
35 | struct index_sequence { | |
36 | using type = index_sequence; | |
37 | using value_type = std::size_t; | |
38 | static constexpr std::size_t size() { | |
39 | return sizeof ... (I); | |
40 | } | |
41 | }; | |
42 | ||
43 | template< typename Seq1, typename Seq2 > | |
44 | struct concat_sequence; | |
45 | ||
46 | template< std::size_t ... I1, std::size_t ... I2 > | |
47 | struct concat_sequence< index_sequence< I1 ... >, index_sequence< I2 ... > > : public index_sequence< I1 ..., (sizeof ... (I1)+I2) ... > { | |
48 | }; | |
49 | ||
50 | template< std::size_t I > | |
51 | struct make_index_sequence : public concat_sequence< typename make_index_sequence< I/2 >::type, | |
52 | typename make_index_sequence< I-I/2 >::type > { | |
53 | }; | |
54 | ||
55 | template<> | |
56 | struct make_index_sequence< 0 > : public index_sequence<> { | |
57 | }; | |
58 | template<> | |
59 | struct make_index_sequence< 1 > : public index_sequence< 0 > { | |
60 | }; | |
61 | ||
62 | template< typename ... T > | |
63 | using index_sequence_for = make_index_sequence< sizeof ... (T) >; | |
64 | #endif | |
65 | ||
66 | }}} | |
67 | ||
68 | #ifdef BOOST_HAS_ABI_HEADERS | |
69 | #include BOOST_ABI_SUFFIX | |
70 | #endif | |
71 | ||
72 | #endif // BOOST_CONTEXT_DETAIL_INDEX_SEQUENCE_H |