1//===- StringSet.h - An efficient set built on StringMap --------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8///
9/// \file
10/// StringSet - A set-like wrapper for the StringMap.
11///
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_ADT_STRINGSET_H
15#define LLVM_ADT_STRINGSET_H
16
17#include "llvm/ADT/StringMap.h"
18
19namespace llvm {
20
21/// StringSet - A wrapper for StringMap that provides set-like functionality.
22template <class AllocatorTy = MallocAllocator>
23class StringSet : public StringMap<std::nullopt_t, AllocatorTy> {
24 using Base = StringMap<std::nullopt_t, AllocatorTy>;
25
26public:
27 StringSet() = default;
28 StringSet(std::initializer_list<StringRef> initializer) {
29 for (StringRef str : initializer)
30 insert(str);
31 }
32 explicit StringSet(AllocatorTy a) : Base(a) {}
33
34 std::pair<typename Base::iterator, bool> insert(StringRef key) {
35 return Base::try_emplace(key);
36 }
37
38 template <typename InputIt>
39 void insert(InputIt begin, InputIt end) {
40 for (auto it = begin; it != end; ++it)
41 insert(*it);
42 }
43
44 template <typename ValueTy>
45 std::pair<typename Base::iterator, bool>
46 insert(const StringMapEntry<ValueTy> &mapEntry) {
47 return insert(mapEntry.getKey());
48 }
49
50 /// Check if the set contains the given \c key.
51 bool contains(StringRef key) const { return Base::FindKey(key) != -1; }
52};
53
54} // end namespace llvm
55
56#endif // LLVM_ADT_STRINGSET_H
57

source code of include/llvm-17/llvm/ADT/StringSet.h