llvm/llvm/include/llvm/ADT/StringSet.h

//===- StringSet.h - An efficient set built on StringMap --------*- 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
//
//===----------------------------------------------------------------------===//
///
/// \file
///  StringSet - A set-like wrapper for the StringMap.
///
//===----------------------------------------------------------------------===//

#ifndef LLVM_ADT_STRINGSET_H
#define LLVM_ADT_STRINGSET_H

#include "llvm/ADT/StringMap.h"

namespace llvm {

/// StringSet - A wrapper for StringMap that provides set-like functionality.
template <class AllocatorTy = MallocAllocator>
class StringSet : public StringMap<std::nullopt_t, AllocatorTy> { … };

} // end namespace llvm

#endif // LLVM_ADT_STRINGSET_H