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)
7 #ifndef BOOST_CONTEXT_DETAIL_INDEX_SEQUENCE_H
8 #define BOOST_CONTEXT_DETAIL_INDEX_SEQUENCE_H
12 #include <boost/config.hpp>
14 #include <boost/context/detail/config.hpp>
16 #ifdef BOOST_HAS_ABI_HEADERS
17 # include BOOST_ABI_PREFIX
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 ... >;
32 //http://stackoverflow.com/questions/17424477/implementation-c14-make-integer-sequence
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);
43 template< typename Seq1, typename Seq2 >
44 struct concat_sequence;
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) ... > {
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 > {
56 struct make_index_sequence< 0 > : public index_sequence<> {
59 struct make_index_sequence< 1 > : public index_sequence< 0 > {
62 template< typename ... T >
63 using index_sequence_for = make_index_sequence< sizeof ... (T) >;
68 #ifdef BOOST_HAS_ABI_HEADERS
69 #include BOOST_ABI_SUFFIX
72 #endif // BOOST_CONTEXT_DETAIL_INDEX_SEQUENCE_H