include/llvm/ADT/StringSet.h

   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
  23 namespace llvm {
  24
  25   /// StringSet - A wrapper for StringMap that provides set-like functionality.
  26   template <class AllocatorTy = MallocAllocator>
  27   class StringSet : public StringMap<char, AllocatorTy> {
  28     using base = StringMap<char, 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, '\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     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