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| 1 | //===----------------------------------------------------------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef _LIBCPP___CXX03___UTILITY_INTEGER_SEQUENCE_H |
| 10 | #define _LIBCPP___CXX03___UTILITY_INTEGER_SEQUENCE_H |
| 11 | |
| 12 | #include <__cxx03/__config> |
| 13 | #include <__cxx03/__type_traits/is_integral.h> |
| 14 | #include <__cxx03/cstddef> |
| 15 | |
| 16 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 17 | # pragma GCC system_header |
| 18 | #endif |
| 19 | |
| 20 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 21 | |
| 22 | template <size_t...> |
| 23 | struct __tuple_indices; |
| 24 | |
| 25 | template <class _IdxType, _IdxType... _Values> |
| 26 | struct __integer_sequence { |
| 27 | template <template <class _OIdxType, _OIdxType...> class _ToIndexSeq, class _ToIndexType> |
| 28 | using __convert = _ToIndexSeq<_ToIndexType, _Values...>; |
| 29 | |
| 30 | template <size_t _Sp> |
| 31 | using __to_tuple_indices = __tuple_indices<(_Values + _Sp)...>; |
| 32 | }; |
| 33 | |
| 34 | #if __has_builtin(__make_integer_seq) |
| 35 | template <size_t _Ep, size_t _Sp> |
| 36 | using __make_indices_imp = |
| 37 | typename __make_integer_seq<__integer_sequence, size_t, _Ep - _Sp>::template __to_tuple_indices<_Sp>; |
| 38 | #elif __has_builtin(__integer_pack) |
| 39 | template <size_t _Ep, size_t _Sp> |
| 40 | using __make_indices_imp = |
| 41 | typename __integer_sequence<size_t, __integer_pack(_Ep - _Sp)...>::template __to_tuple_indices<_Sp>; |
| 42 | #else |
| 43 | # error "No known way to get an integer pack from the compiler" |
| 44 | #endif |
| 45 | |
| 46 | _LIBCPP_END_NAMESPACE_STD |
| 47 | |
| 48 | #endif // _LIBCPP___CXX03___UTILITY_INTEGER_SEQUENCE_H |
| 49 |
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