41 lines
1.3 KiB
C++
41 lines
1.3 KiB
C++
//===-- integer_sequence utility --------------------------------*- 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 LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_INTEGER_SEQUENCE_H
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#define LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_INTEGER_SEQUENCE_H
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#include "src/__support/CPP/type_traits/is_integral.h"
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#include "src/__support/macros/config.h"
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namespace LIBC_NAMESPACE_DECL {
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namespace cpp {
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// integer_sequence
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template <typename T, T... Ints> struct integer_sequence {
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static_assert(cpp::is_integral_v<T>);
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template <T Next> using append = integer_sequence<T, Ints..., Next>;
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};
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namespace detail {
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template <typename T, int N> struct make_integer_sequence {
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using type =
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typename make_integer_sequence<T, N - 1>::type::template append<N>;
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};
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template <typename T> struct make_integer_sequence<T, -1> {
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using type = integer_sequence<T>;
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};
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} // namespace detail
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template <typename T, int N>
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using make_integer_sequence =
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typename detail::make_integer_sequence<T, N - 1>::type;
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} // namespace cpp
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} // namespace LIBC_NAMESPACE_DECL
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#endif // LLVM_LIBC_SRC___SUPPORT_CPP_UTILITY_INTEGER_SEQUENCE_H
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