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127 lines
3.6 KiB
C++
127 lines
3.6 KiB
C++
//===- llvm/ADT/DenseSet.h - Dense probed hash table ------------*- 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 Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the DenseSet class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_DENSESET_H
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#define LLVM_ADT_DENSESET_H
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#include "llvm/ADT/DenseMap.h"
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namespace llvm {
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/// DenseSet - This implements a dense probed hash-table based set.
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///
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/// FIXME: This is currently implemented directly in terms of DenseMap, this
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/// should be optimized later if there is a need.
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template<typename ValueT, typename ValueInfoT = DenseMapInfo<ValueT> >
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class DenseSet {
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typedef DenseMap<ValueT, char, ValueInfoT> MapTy;
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MapTy TheMap;
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public:
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DenseSet(const DenseSet &Other) : TheMap(Other.TheMap) {}
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explicit DenseSet(unsigned NumInitBuckets = 64) : TheMap(NumInitBuckets) {}
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bool empty() const { return TheMap.empty(); }
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unsigned size() const { return TheMap.size(); }
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void clear() {
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TheMap.clear();
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}
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bool count(const ValueT &V) const {
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return TheMap.count(V);
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}
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bool erase(const ValueT &V) {
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return TheMap.erase(V);
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}
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void swap(DenseSet& RHS) {
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TheMap.swap(RHS.TheMap);
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}
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DenseSet &operator=(const DenseSet &RHS) {
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TheMap = RHS.TheMap;
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return *this;
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}
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// Iterators.
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class Iterator {
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typename MapTy::iterator I;
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friend class DenseSet;
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public:
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typedef typename MapTy::iterator::difference_type difference_type;
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typedef ValueT value_type;
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typedef value_type *pointer;
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typedef value_type &reference;
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typedef std::forward_iterator_tag iterator_category;
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Iterator(const typename MapTy::iterator &i) : I(i) {}
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ValueT& operator*() { return I->first; }
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ValueT* operator->() { return &I->first; }
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Iterator& operator++() { ++I; return *this; }
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bool operator==(const Iterator& X) const { return I == X.I; }
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bool operator!=(const Iterator& X) const { return I != X.I; }
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};
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class ConstIterator {
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typename MapTy::const_iterator I;
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friend class DenseSet;
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public:
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typedef typename MapTy::const_iterator::difference_type difference_type;
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typedef ValueT value_type;
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typedef value_type *pointer;
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typedef value_type &reference;
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typedef std::forward_iterator_tag iterator_category;
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ConstIterator(const typename MapTy::const_iterator &i) : I(i) {}
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const ValueT& operator*() { return I->first; }
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const ValueT* operator->() { return &I->first; }
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ConstIterator& operator++() { ++I; return *this; }
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bool operator==(const ConstIterator& X) const { return I == X.I; }
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bool operator!=(const ConstIterator& X) const { return I != X.I; }
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};
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typedef Iterator iterator;
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typedef ConstIterator const_iterator;
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iterator begin() { return Iterator(TheMap.begin()); }
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iterator end() { return Iterator(TheMap.end()); }
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const_iterator begin() const { return ConstIterator(TheMap.begin()); }
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const_iterator end() const { return ConstIterator(TheMap.end()); }
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iterator find(const ValueT &V) { return Iterator(TheMap.find(V)); }
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void erase(Iterator I) { return TheMap.erase(I.I); }
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void erase(ConstIterator CI) { return TheMap.erase(CI.I); }
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std::pair<iterator, bool> insert(const ValueT &V) {
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return TheMap.insert(std::make_pair(V, 0));
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}
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// Range insertion of values.
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template<typename InputIt>
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void insert(InputIt I, InputIt E) {
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for (; I != E; ++I)
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insert(*I);
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}
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};
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} // end namespace llvm
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#endif
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