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368faacac7
This commit reverts 5aaefa51 (and also partly 7f285f48e77 and b6d75682f9, which were related to the original commit). As landed, 5aaefa51 had unintended consequences on some downstream bots and didn't have proper coverage upstream due to a few subtle things. Implementing this is something we should do in libc++, however we'll first need to address a few issues listed in https://reviews.llvm.org/D106124#3349710. Differential Revision: https://reviews.llvm.org/D120683
79 lines
2.5 KiB
C++
79 lines
2.5 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___UTILITY_INTEGER_SEQUENCE_H
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#define _LIBCPP___UTILITY_INTEGER_SEQUENCE_H
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#include <__config>
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#include <type_traits>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER > 11
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template<class _Tp, _Tp... _Ip>
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struct _LIBCPP_TEMPLATE_VIS integer_sequence
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{
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typedef _Tp value_type;
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static_assert( is_integral<_Tp>::value,
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"std::integer_sequence can only be instantiated with an integral type" );
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static
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_LIBCPP_INLINE_VISIBILITY
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constexpr
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size_t
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size() noexcept { return sizeof...(_Ip); }
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};
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template<size_t... _Ip>
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using index_sequence = integer_sequence<size_t, _Ip...>;
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#if __has_builtin(__make_integer_seq) && !defined(_LIBCPP_TESTING_FALLBACK_MAKE_INTEGER_SEQUENCE)
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template <class _Tp, _Tp _Ep>
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using __make_integer_sequence _LIBCPP_NODEBUG = __make_integer_seq<integer_sequence, _Tp, _Ep>;
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#else
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template<typename _Tp, _Tp _Np> using __make_integer_sequence_unchecked _LIBCPP_NODEBUG =
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typename __detail::__make<_Np>::type::template __convert<integer_sequence, _Tp>;
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template <class _Tp, _Tp _Ep>
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struct __make_integer_sequence_checked
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{
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static_assert(is_integral<_Tp>::value,
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"std::make_integer_sequence can only be instantiated with an integral type" );
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static_assert(0 <= _Ep, "std::make_integer_sequence must have a non-negative sequence length");
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// Workaround GCC bug by preventing bad installations when 0 <= _Ep
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// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68929
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typedef _LIBCPP_NODEBUG __make_integer_sequence_unchecked<_Tp, 0 <= _Ep ? _Ep : 0> type;
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};
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template <class _Tp, _Tp _Ep>
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using __make_integer_sequence _LIBCPP_NODEBUG = typename __make_integer_sequence_checked<_Tp, _Ep>::type;
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#endif
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template<class _Tp, _Tp _Np>
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using make_integer_sequence = __make_integer_sequence<_Tp, _Np>;
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template<size_t _Np>
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using make_index_sequence = make_integer_sequence<size_t, _Np>;
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template<class... _Tp>
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using index_sequence_for = make_index_sequence<sizeof...(_Tp)>;
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#endif // _LIBCPP_STD_VER > 11
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___UTILITY_INTEGER_SEQUENCE_H
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