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headers/private/kernel/util/OpenHashTable.h, Hugo's version, is a bit nicer than

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Tracker's OpenHashTable.h which it should eventually replace. We've renamed the
class to BOpenHashTable and changed the interface slightly so that HashTableLink
became superfluous.
Adapted all the code that used it. Since the OpenHashTables no longer clash,
this should fix the GCC4 build.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@31791 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Stephan Aßmus
2009-07-27 00:39:12 +00:00
parent 8e1857f795
commit 5147963dcd
59 changed files with 346 additions and 311 deletions
Download Patch File Download Diff File Expand all files Collapse all files
headers/private/kernel/util/OpenHashTable.h
+41 -43
View File
@@ -21,10 +21,10 @@
`Compare' and `GetLink;. It must also define several types as shown in the
following example:
struct Foo : HashTableLink<Foo> {
struct Foo {
int bar;
HashTableLink<Foo> otherLink;
Foo* fNext;
};
struct HashTableDefinition {
@@ -34,22 +34,18 @@
HashTableDefinition(const HashTableDefinition&) {}
size_t HashKey(int key) const { return key >> 1; }
size_t Hash(Foo *value) const { return HashKey(value->bar); }
bool Compare(int key, Foo *value) const { return value->bar == key; }
HashTableLink<Foo> *GetLink(Foo *value) const { return value; }
size_t Hash(Foo* value) const { return HashKey(value->bar); }
bool Compare(int key, Foo* value) const { return value->bar == key; }
Foo*& GetLink(Foo* value) const { return value->fNext; }
};
*/
template<typename Type>
struct HashTableLink {
Type *fNext;
};
template<typename Definition, bool AutoExpand = true,
bool CheckDuplicates = false>
class OpenHashTable {
class BOpenHashTable {
public:
typedef OpenHashTable<Definition, AutoExpand, CheckDuplicates> HashTable;
typedef BOpenHashTable<Definition, AutoExpand, CheckDuplicates> HashTable;
typedef typename Definition::KeyType KeyType;
typedef typename Definition::ValueType ValueType;
@@ -62,7 +58,7 @@ public:
// regrowth factor: 200 / 256 = 78.125%
// 50 / 256 = 19.53125%
OpenHashTable()
BOpenHashTable()
:
fTableSize(0),
fItemCount(0),
@@ -70,7 +66,7 @@ public:
{
}
OpenHashTable(const Definition& definition)
BOpenHashTable(const Definition& definition)
:
fDefinition(definition),
fTableSize(0),
@@ -79,7 +75,7 @@ public:
{
}
~OpenHashTable()
~BOpenHashTable()
{
free(fTable);
}
@@ -101,24 +97,24 @@ public:
return fItemCount;
}
ValueType *Lookup(const KeyType &key) const
ValueType* Lookup(const KeyType& key) const
{
if (fTableSize == 0)
return NULL;
size_t index = fDefinition.HashKey(key) & (fTableSize - 1);
ValueType *slot = fTable[index];
ValueType* slot = fTable[index];
while (slot) {
if (fDefinition.Compare(key, slot))
break;
slot = _Link(slot)->fNext;
slot = _Link(slot);
}
return slot;
}
status_t Insert(ValueType *value)
status_t Insert(ValueType* value)
{
if (fTableSize == 0) {
if (!_Resize(kMinimumSize))
@@ -130,7 +126,7 @@ public:
return B_OK;
}
void InsertUnchecked(ValueType *value)
void InsertUnchecked(ValueType* value)
{
if (CheckDuplicates && _ExhaustiveSearch(value)) {
#ifdef _KERNEL_MODE
@@ -146,7 +142,7 @@ public:
// TODO: a ValueType* Remove(const KeyType& key) method is missing
bool Remove(ValueType *value)
bool Remove(ValueType* value)
{
if (!RemoveUnchecked(value))
return false;
@@ -158,17 +154,18 @@ public:
return true;
}
bool RemoveUnchecked(ValueType *value)
bool RemoveUnchecked(ValueType* value)
{
size_t index = fDefinition.Hash(value) & (fTableSize - 1);
ValueType *previous = NULL, *slot = fTable[index];
ValueType* previous = NULL;
ValueType* slot = fTable[index];
while (slot) {
ValueType *next = _Link(slot)->fNext;
ValueType* next = _Link(slot);
if (value == slot) {
if (previous)
_Link(previous)->fNext = next;
_Link(previous) = next;
else
fTable[index] = next;
break;
@@ -217,7 +214,7 @@ public:
// update nextPointer to point to the fNext of the last
// element in the bucket
while (element != NULL) {
nextPointer = &_Link(element)->fNext;
nextPointer = &_Link(element);
element = *nextPointer;
}
}
@@ -274,20 +271,20 @@ public:
class Iterator {
public:
Iterator(const HashTable *table)
Iterator(const HashTable* table)
: fTable(table)
{
Rewind();
}
Iterator(const HashTable *table, size_t index, ValueType *value)
Iterator(const HashTable* table, size_t index, ValueType* value)
: fTable(table), fIndex(index), fNext(value) {}
bool HasNext() const { return fNext != NULL; }
ValueType *Next()
ValueType* Next()
{
ValueType *current = fNext;
ValueType* current = fNext;
_GetNext();
return current;
}
@@ -306,15 +303,15 @@ public:
void _GetNext()
{
if (fNext)
fNext = fTable->_Link(fNext)->fNext;
fNext = fTable->_Link(fNext);
while (fNext == NULL && fIndex < fTable->fTableSize)
fNext = fTable->fTable[fIndex++];
}
const HashTable *fTable;
const HashTable* fTable;
size_t fIndex;
ValueType *fNext;
ValueType* fNext;
};
Iterator GetIterator() const { return Iterator(this); }
@@ -323,11 +320,11 @@ protected:
// for g++ 2.95
friend class Iterator;
void _Insert(ValueType **table, size_t tableSize, ValueType *value)
void _Insert(ValueType** table, size_t tableSize, ValueType* value)
{
size_t index = fDefinition.Hash(value) & (tableSize - 1);
_Link(value)->fNext = table[index];
_Link(value) = table[index];
table[index] = value;
}
@@ -349,9 +346,9 @@ protected:
if (fTable) {
for (size_t i = 0; i < fTableSize; i++) {
ValueType *bucket = fTable[i];
ValueType* bucket = fTable[i];
while (bucket) {
ValueType *next = _Link(bucket)->fNext;
ValueType* next = _Link(bucket);
_Insert(newTable, newSize, bucket);
bucket = next;
}
@@ -364,28 +361,29 @@ protected:
fTable = newTable;
}
HashTableLink<ValueType> *_Link(ValueType *bucket) const
ValueType*& _Link(ValueType* bucket) const
{
return fDefinition.GetLink(bucket);
}
bool _ExhaustiveSearch(ValueType *value) const
bool _ExhaustiveSearch(ValueType* value) const
{
for (size_t i = 0; i < fTableSize; i++) {
ValueType *bucket = fTable[i];
ValueType* bucket = fTable[i];
while (bucket) {
if (bucket == value)
return true;
bucket = _Link(bucket)->fNext;
bucket = _Link(bucket);
}
}
return false;
}
Definition fDefinition;
size_t fTableSize, fItemCount;
ValueType **fTable;
Definition fDefinition;
size_t fTableSize;
size_t fItemCount;
ValueType** fTable;
};
#endif // _KERNEL_UTIL_OPEN_HASH_TABLE_H