llvm-6502/include/llvm/ADT/DenseSet.h
2008-07-07 17:46:23 +00:00

98 lines
2.8 KiB
C++

//===- llvm/ADT/DenseSet.h - Dense probed hash table ------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the DenseSet class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ADT_DENSESET_H
#define LLVM_ADT_DENSESET_H
#include "llvm/ADT/DenseMap.h"
namespace llvm {
/// DenseSet - This implements a dense probed hash-table based set.
///
/// FIXME: This is currently implemented directly in terms of DenseMap, this
/// should be optimized later if there is a need.
template<typename ValueT, typename ValueInfoT = DenseMapInfo<ValueT> >
class DenseSet {
typedef DenseMap<ValueT, char, ValueInfoT> MapTy;
MapTy TheMap;
public:
DenseSet(const DenseSet &Other) : TheMap(Other.TheMap) {}
explicit DenseSet(unsigned NumInitBuckets = 64) : TheMap(NumInitBuckets) {}
bool empty() const { return TheMap.empty(); }
unsigned size() const { return TheMap.size(); }
void clear() {
TheMap.clear();
}
bool count(const ValueT &V) const {
return TheMap.count(V);
}
void erase(const ValueT &V) {
TheMap.erase(V);
}
DenseSet &operator=(const DenseSet &RHS) {
TheMap = RHS.TheMap;
return *this;
}
// Iterators.
class Iterator {
typename MapTy::iterator I;
public:
Iterator(const typename MapTy::iterator &i) : I(i) {}
ValueT& operator*() { return I->first; }
ValueT* operator->() { return &I->first; }
Iterator& operator++() { ++I; return *this; };
bool operator==(const Iterator& X) const { return I == X.I; }
bool operator!=(const Iterator& X) const { return I != X.I; }
};
class ConstIterator {
typename MapTy::const_iterator I;
public:
ConstIterator(const typename MapTy::const_iterator &i) : I(i) {}
const ValueT& operator*() { return I->first; }
const ValueT* operator->() { return &I->first; }
ConstIterator& operator++() { ++I; return *this; };
bool operator==(const ConstIterator& X) const { return I == X.I; }
bool operator!=(const ConstIterator& X) const { return I != X.I; }
};
typedef Iterator iterator;
typedef ConstIterator const_iterator;
iterator begin() { return Iterator(TheMap.begin()); }
iterator end() { return Iterator(TheMap.end()); }
const_iterator begin() const { return ConstIterator(TheMap.begin()); }
const_iterator end() const { return ConstIterator(TheMap.end()); }
std::pair<iterator, bool> insert(const ValueT &V) {
return TheMap.insert(std::make_pair(V, 0));
}
};
} // end namespace llvm
#endif