forked from OSchip/llvm-project
40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
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//===-- A self contained equivalent of std::bitset --------------*- 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_UTILS_CPP_BITSET_H
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#define LLVM_LIBC_UTILS_CPP_BITSET_H
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#include <stddef.h> // For size_t.
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#include <stdint.h> // For uintptr_t.
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namespace __llvm_libc {
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namespace cpp {
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template <size_t NumberOfBits> struct Bitset {
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static_assert(NumberOfBits != 0,
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"Cannot create a __llvm_libc::cpp::Bitset of size 0.");
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constexpr void set(size_t Index) {
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Data[Index / BitsPerUnit] |= (uintptr_t{1} << (Index % BitsPerUnit));
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}
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constexpr bool test(size_t Index) const {
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return Data[Index / BitsPerUnit] & (uintptr_t{1} << (Index % BitsPerUnit));
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}
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private:
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static constexpr size_t BitsPerByte = 8;
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static constexpr size_t BitsPerUnit = BitsPerByte * sizeof(uintptr_t);
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uintptr_t Data[(NumberOfBits + BitsPerUnit - 1) / BitsPerUnit] = {0};
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};
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} // namespace cpp
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} // namespace __llvm_libc
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#endif // LLVM_LIBC_UTILS_CPP_BITSET_H
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