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add find/erase, add const iterators, fix bugs in iterators.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33791 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-02-02 20:34:32 +00:00
parent f6390f48e6
commit 70a76a633e
1 changed files with 67 additions and 19 deletions
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86
include/llvm/ADT/DenseMap.h
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@ -41,6 +41,8 @@ struct DenseMapKeyInfo<T*> {
template<typename KeyT, typename ValueT>
class DenseMapIterator;
template<typename KeyT, typename ValueT>
class DenseMapConstIterator;
template<typename KeyT, typename ValueT>
class DenseMap {
@ -65,10 +67,23 @@ public:
}
typedef DenseMapIterator<KeyT, ValueT> iterator;
typedef DenseMapIterator<KeyT, ValueT> const_iterator;
inline iterator begin() const;
inline iterator end() const;
typedef DenseMapConstIterator<KeyT, ValueT> const_iterator;
inline iterator begin() {
return DenseMapIterator<KeyT, ValueT>(Buckets, Buckets+NumBuckets);
}
inline iterator end() {
return DenseMapIterator<KeyT, ValueT>(Buckets+NumBuckets,
Buckets+NumBuckets);
}
inline const_iterator begin() const {
return DenseMapConstIterator<KeyT, ValueT>(Buckets, Buckets+NumBuckets);
}
inline const_iterator end() const {
return DenseMapConstIterator<KeyT, ValueT>(Buckets+NumBuckets,
Buckets+NumBuckets);
}
bool empty() const { return NumEntries == 0; }
unsigned size() const { return NumEntries; }
void clear() {
@ -89,6 +104,31 @@ public:
return LookupBucketFor(Val, TheBucket);
}
iterator find(const KeyT &Val) const {
BucketT *TheBucket;
if (LookupBucketFor(Val, TheBucket))
return iterator(TheBucket, Buckets+NumBuckets);
return end();
}
bool erase(const KeyT &Val) {
BucketT *TheBucket;
if (!LookupBucketFor(Val, TheBucket))
return false; // not in map.
TheBucket->second.~ValueT();
TheBucket->first = getTombstoneKey();
--NumEntries;
return true;
}
bool erase(iterator I) {
BucketT *TheBucket = &*I;
TheBucket->second.~ValueT();
TheBucket->first = getTombstoneKey();
--NumEntries;
return true;
}
ValueT &operator[](const KeyT &Val) {
BucketT *TheBucket;
if (LookupBucketFor(Val, TheBucket))
@ -106,11 +146,13 @@ public:
}
private:
unsigned getHashValue(const KeyT &Val) const {
static unsigned getHashValue(const KeyT &Val) {
return DenseMapKeyInfo<KeyT>::getHashValue(Val);
}
const KeyT getEmptyKey() const { return DenseMapKeyInfo<KeyT>::getEmptyKey();}
const KeyT getTombstoneKey() const {
static const KeyT getEmptyKey() {
return DenseMapKeyInfo<KeyT>::getEmptyKey();
}
static const KeyT getTombstoneKey() {
return DenseMapKeyInfo<KeyT>::getTombstoneKey();
}
@ -209,17 +251,18 @@ private:
template<typename KeyT, typename ValueT>
class DenseMapIterator {
typedef std::pair<KeyT, ValueT> BucketT;
protected:
const BucketT *Ptr, *End;
public:
DenseMapIterator(const BucketT *Pos, const BucketT *E) : Ptr(Pos), End(E) {
AdvancePastEmptyBuckets();
}
const std::pair<KeyT, ValueT> &operator*() const {
return *Ptr;
std::pair<KeyT, ValueT> &operator*() const {
return *const_cast<BucketT*>(Ptr);
}
const std::pair<KeyT, ValueT> *operator->() const {
return Ptr;
std::pair<KeyT, ValueT> *operator->() const {
return const_cast<BucketT*>(Ptr);
}
bool operator==(const DenseMapIterator &RHS) const {
@ -243,20 +286,25 @@ private:
const KeyT Empty = DenseMapKeyInfo<KeyT>::getEmptyKey();
const KeyT Tombstone = DenseMapKeyInfo<KeyT>::getTombstoneKey();
while (Ptr != End && Ptr->first != Empty && Ptr->first != Tombstone)
while (Ptr != End && (Ptr->first == Empty || Ptr->first == Tombstone))
++Ptr;
}
};
template<typename KeyT, typename ValueT>
inline DenseMapIterator<KeyT, ValueT> DenseMap<KeyT, ValueT>::begin() const {
return DenseMapIterator<KeyT, ValueT>(Buckets, Buckets+NumBuckets);
}
template<typename KeyT, typename ValueT>
inline DenseMapIterator<KeyT, ValueT> DenseMap<KeyT, ValueT>::end() const {
return DenseMapIterator<KeyT, ValueT>(Buckets+NumBuckets, Buckets+NumBuckets);
}
class DenseMapConstIterator : public DenseMapIterator<KeyT, ValueT> {
public:
DenseMapConstIterator(const std::pair<KeyT, ValueT> *Pos,
const std::pair<KeyT, ValueT> *E)
: DenseMapIterator<KeyT, ValueT>(Pos, E) {
}
const std::pair<KeyT, ValueT> &operator*() const {
return *this->Ptr;
}
const std::pair<KeyT, ValueT> *operator->() const {
return this->Ptr;
}
};
} // end namespace llvm