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 19 namespace llvm { 20 21 /// StringSet - A wrapper for StringMap that provides set-like functionality. 22 template <class AllocatorTy = MallocAllocator> 23 class StringSet : public StringMap<std::nullopt_t, AllocatorTy> { 24 using Base = StringMap<std::nullopt_t, AllocatorTy>; 25 26 public: 27 StringSet() = default; StringSet(std::initializer_list<StringRef> initializer)28 StringSet(std::initializer_list<StringRef> initializer) { 29 for (StringRef str : initializer) 30 insert(str); 31 } StringSet(Container && C)32 template <typename Container> explicit StringSet(Container &&C) { 33 for (auto &&Str : C) 34 insert(Str); 35 } StringSet(AllocatorTy a)36 explicit StringSet(AllocatorTy a) : Base(a) {} 37 insert(StringRef key)38 std::pair<typename Base::iterator, bool> insert(StringRef key) { 39 return Base::try_emplace(key); 40 } 41 42 template <typename InputIt> insert(InputIt begin,InputIt end)43 void insert(InputIt begin, InputIt end) { 44 for (auto it = begin; it != end; ++it) 45 insert(*it); 46 } 47 48 template <typename ValueTy> 49 std::pair<typename Base::iterator, bool> insert(const StringMapEntry<ValueTy> & mapEntry)50 insert(const StringMapEntry<ValueTy> &mapEntry) { 51 return insert(mapEntry.getKey()); 52 } 53 54 /// Check if the set contains the given \c key. contains(StringRef key)55 bool contains(StringRef key) const { return Base::FindKey(key) != -1; } 56 }; 57 58 } // end namespace llvm 59 60 #endif // LLVM_ADT_STRINGSET_H 61