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