llvm/llvm/include/llvm/ADT/Bitset.h

//=== llvm/ADT/Bitset.h - constexpr 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
//
//===----------------------------------------------------------------------===//
//
// Defines a std::bitset like container that can be used in constexprs.
// That constructor and many of the methods are constexpr. std::bitset doesn't
// get constexpr methods until C++23. This class also provides a constexpr
// constructor that accepts an initializer_list of bits to set.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_ADT_BITSET_H
#define LLVM_ADT_BITSET_H

#include <llvm/ADT/STLExtras.h>
#include <array>
#include <climits>
#include <cstdint>

namespace llvm {

/// This is a constexpr reimplementation of a subset of std::bitset. It would be
/// nice to use std::bitset directly, but it doesn't support constant
/// initialization.
template <unsigned NumBits>
class Bitset { … };

} // end namespace llvm

#endif