1//===- StringSet.h - The LLVM Compiler Driver -------------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open
6// Source License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
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#include "llvm/ADT/StringRef.h"
19#include "llvm/Support/Allocator.h"
20#include <cassert>
21#include <initializer_list>
22#include <utility>
23
24namespace llvm {
25
26  /// StringSet - A wrapper for StringMap that provides set-like functionality.
27  template <class AllocatorTy = MallocAllocator>
28  class StringSet : public StringMap<char, AllocatorTy> {
29    using base = StringMap<char, AllocatorTy>;
30
31  public:
32    StringSet() = default;
33    StringSet(std::initializer_list<StringRef> S) {
34      for (StringRef X : S)
35        insert(X);
36    }
37
38    std::pair<typename base::iterator, bool> insert(StringRef Key) {
39      assert(!Key.empty());
40      return base::insert(std::make_pair(Key, '\0'));
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, '\0'));
47    }
48  };
49
50} // end namespace llvm
51
52#endif // LLVM_ADT_STRINGSET_H
53