1//===- StringSet.h - The LLVM Compiler Driver -------------------*- 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//  StringSet - A set-like wrapper for the StringMap.
10//
11//===----------------------------------------------------------------------===//
12
13#ifndef LLVM_ADT_STRINGSET_H
14#define LLVM_ADT_STRINGSET_H
15
16#include "llvm/ADT/StringMap.h"
17#include "llvm/ADT/StringRef.h"
18#include "llvm/Support/Allocator.h"
19#include <cassert>
20#include <initializer_list>
21#include <utility>
22
23namespace llvm {
24
25  /// StringSet - A wrapper for StringMap that provides set-like functionality.
26  template <class AllocatorTy = MallocAllocator>
27  class StringSet : public StringMap<NoneType, AllocatorTy> {
28    using base = StringMap<NoneType, AllocatorTy>;
29
30  public:
31    StringSet() = default;
32    StringSet(std::initializer_list<StringRef> S) {
33      for (StringRef X : S)
34        insert(X);
35    }
36    explicit StringSet(AllocatorTy A) : base(A) {}
37
38    std::pair<typename base::iterator, bool> insert(StringRef Key) {
39      assert(!Key.empty());
40      return base::insert(std::make_pair(Key, None));
41    }
42
43    template <typename InputIt>
44    void insert(const InputIt &Begin, const InputIt &End) {
45      for (auto It = Begin; It != End; ++It)
46        base::insert(std::make_pair(*It, None));
47    }
48
49    template <typename ValueTy>
50    std::pair<typename base::iterator, bool>
51    insert(const StringMapEntry<ValueTy> &MapEntry) {
52      return insert(MapEntry.getKey());
53    }
54  };
55
56} // end namespace llvm
57
58#endif // LLVM_ADT_STRINGSET_H
59