Bitset.h
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//===-- A self contained equivalent of std::bitset --------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIBC_UTILS_CPP_BITSET_H
#define LLVM_LIBC_UTILS_CPP_BITSET_H
#include <stddef.h> // For size_t.
#include <stdint.h> // For uintptr_t.
namespace __llvm_libc {
namespace cpp {
template <size_t NumberOfBits> struct Bitset {
static_assert(NumberOfBits != 0,
"Cannot create a __llvm_libc::cpp::Bitset of size 0.");
constexpr void set(size_t Index) {
Data[Index / BitsPerUnit] |= (uintptr_t{1} << (Index % BitsPerUnit));
}
constexpr bool test(size_t Index) const {
return Data[Index / BitsPerUnit] & (uintptr_t{1} << (Index % BitsPerUnit));
}
private:
static constexpr size_t BitsPerByte = 8;
static constexpr size_t BitsPerUnit = BitsPerByte * sizeof(uintptr_t);
uintptr_t Data[(NumberOfBits + BitsPerUnit - 1) / BitsPerUnit] = {0};
};
} // namespace cpp
} // namespace __llvm_libc
#endif // LLVM_LIBC_UTILS_CPP_BITSET_H