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dfe91cefd2
- The previous implementation always constructed the StringMap entry, even if the key was present in the set. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177178 91177308-0d34-0410-b5e6-96231b3b80d8
46 lines
1.5 KiB
C++
46 lines
1.5 KiB
C++
//===--- StringSet.h - The LLVM Compiler Driver -----------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open
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// Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// StringSet - A set-like wrapper for the StringMap.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_STRINGSET_H
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#define LLVM_ADT_STRINGSET_H
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#include "llvm/ADT/StringMap.h"
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namespace llvm {
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/// StringSet - A wrapper for StringMap that provides set-like functionality.
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template <class AllocatorTy = llvm::MallocAllocator>
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class StringSet : public llvm::StringMap<char, AllocatorTy> {
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typedef llvm::StringMap<char, AllocatorTy> base;
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public:
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/// insert - Insert the specified key into the set. If the key already
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/// exists in the set, return false and ignore the request, otherwise insert
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/// it and return true.
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bool insert(StringRef Key) {
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// Get or create the map entry for the key; if it doesn't exist the value
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// type will be default constructed which we use to detect insert.
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//
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// We use '+' as the sentinel value in the map.
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assert(!Key.empty());
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StringMapEntry<char> &Entry = this->GetOrCreateValue(Key);
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if (Entry.getValue() == '+')
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return false;
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Entry.setValue('+');
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return true;
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}
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};
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}
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#endif // LLVM_ADT_STRINGSET_H
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