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-rw-r--r--core/hash_map.h141
1 files changed, 52 insertions, 89 deletions
diff --git a/core/hash_map.h b/core/hash_map.h
index f27a86cc02..78592f8d82 100644
--- a/core/hash_map.h
+++ b/core/hash_map.h
@@ -59,7 +59,6 @@ template <class TKey, class TData, class Hasher = HashMapHasherDefault, class Co
class HashMap {
public:
struct Pair {
-
TKey key;
TData data;
@@ -75,8 +74,8 @@ public:
friend class HashMap;
uint32_t hash;
- Element *next;
- Element() { next = 0; }
+ Element *next = nullptr;
+ Element() {}
Pair pair;
public:
@@ -94,34 +93,32 @@ public:
};
private:
- Element **hash_table;
- uint8_t hash_table_power;
- uint32_t elements;
+ Element **hash_table = nullptr;
+ uint8_t hash_table_power = 0;
+ uint32_t elements = 0;
void make_hash_table() {
-
ERR_FAIL_COND(hash_table);
hash_table = memnew_arr(Element *, (1 << MIN_HASH_TABLE_POWER));
hash_table_power = MIN_HASH_TABLE_POWER;
elements = 0;
- for (int i = 0; i < (1 << MIN_HASH_TABLE_POWER); i++)
- hash_table[i] = 0;
+ for (int i = 0; i < (1 << MIN_HASH_TABLE_POWER); i++) {
+ hash_table[i] = nullptr;
+ }
}
void erase_hash_table() {
-
ERR_FAIL_COND_MSG(elements, "Cannot erase hash table if there are still elements inside.");
memdelete_arr(hash_table);
- hash_table = 0;
+ hash_table = nullptr;
hash_table_power = 0;
elements = 0;
}
void check_hash_table() {
-
int new_hash_table_power = -1;
if ((int)elements > ((1 << hash_table_power) * RELATIONSHIP)) {
@@ -129,40 +126,36 @@ private:
new_hash_table_power = hash_table_power + 1;
while ((int)elements > ((1 << new_hash_table_power) * RELATIONSHIP)) {
-
new_hash_table_power++;
}
} else if ((hash_table_power > (int)MIN_HASH_TABLE_POWER) && ((int)elements < ((1 << (hash_table_power - 1)) * RELATIONSHIP))) {
-
/* rehash down */
new_hash_table_power = hash_table_power - 1;
while ((int)elements < ((1 << (new_hash_table_power - 1)) * RELATIONSHIP)) {
-
new_hash_table_power--;
}
- if (new_hash_table_power < (int)MIN_HASH_TABLE_POWER)
+ if (new_hash_table_power < (int)MIN_HASH_TABLE_POWER) {
new_hash_table_power = MIN_HASH_TABLE_POWER;
+ }
}
- if (new_hash_table_power == -1)
+ if (new_hash_table_power == -1) {
return;
+ }
Element **new_hash_table = memnew_arr(Element *, ((uint64_t)1 << new_hash_table_power));
ERR_FAIL_COND_MSG(!new_hash_table, "Out of memory.");
for (int i = 0; i < (1 << new_hash_table_power); i++) {
-
- new_hash_table[i] = 0;
+ new_hash_table[i] = nullptr;
}
if (hash_table) {
for (int i = 0; i < (1 << hash_table_power); i++) {
-
while (hash_table[i]) {
-
Element *se = hash_table[i];
hash_table[i] = se->next;
int new_pos = se->hash & ((1 << new_hash_table_power) - 1);
@@ -179,17 +172,14 @@ private:
/* I want to have only one function.. */
_FORCE_INLINE_ const Element *get_element(const TKey &p_key) const {
-
uint32_t hash = Hasher::hash(p_key);
uint32_t index = hash & ((1 << hash_table_power) - 1);
Element *e = hash_table[index];
while (e) {
-
/* checking hash first avoids comparing key, which may take longer */
if (e->hash == hash && Comparator::compare(e->pair.key, p_key)) {
-
/* the pair exists in this hashtable, so just update data */
return e;
}
@@ -201,7 +191,6 @@ private:
}
Element *create_element(const TKey &p_key) {
-
/* if element doesn't exist, create it */
Element *e = memnew(Element);
ERR_FAIL_COND_V_MSG(!e, nullptr, "Out of memory.");
@@ -219,27 +208,26 @@ private:
}
void copy_from(const HashMap &p_t) {
-
- if (&p_t == this)
+ if (&p_t == this) {
return; /* much less bother with that */
+ }
clear();
- if (!p_t.hash_table || p_t.hash_table_power == 0)
+ if (!p_t.hash_table || p_t.hash_table_power == 0) {
return; /* not copying from empty table */
+ }
hash_table = memnew_arr(Element *, (uint64_t)1 << p_t.hash_table_power);
hash_table_power = p_t.hash_table_power;
elements = p_t.elements;
for (int i = 0; i < (1 << p_t.hash_table_power); i++) {
-
hash_table[i] = nullptr;
const Element *e = p_t.hash_table[i];
while (e) {
-
Element *le = memnew(Element); /* local element */
*le = *e; /* copy data */
@@ -259,20 +247,20 @@ public:
}
Element *set(const Pair &p_pair) {
-
Element *e = nullptr;
- if (!hash_table)
+ if (!hash_table) {
make_hash_table(); // if no table, make one
- else
+ } else {
e = const_cast<Element *>(get_element(p_pair.key));
+ }
/* if we made it up to here, the pair doesn't exist, create and assign */
if (!e) {
-
e = create_element(p_pair.key);
- if (!e)
+ if (!e) {
return nullptr;
+ }
check_hash_table(); // perform mantenience routine
}
@@ -281,7 +269,6 @@ public:
}
bool has(const TKey &p_key) const {
-
return getptr(p_key) != nullptr;
}
@@ -292,14 +279,12 @@ public:
*/
const TData &get(const TKey &p_key) const {
-
const TData *res = getptr(p_key);
ERR_FAIL_COND_V(!res, *res);
return *res;
}
TData &get(const TKey &p_key) {
-
TData *res = getptr(p_key);
ERR_FAIL_COND_V(!res, *res);
return *res;
@@ -311,27 +296,29 @@ public:
*/
_FORCE_INLINE_ TData *getptr(const TKey &p_key) {
-
- if (unlikely(!hash_table))
+ if (unlikely(!hash_table)) {
return nullptr;
+ }
Element *e = const_cast<Element *>(get_element(p_key));
- if (e)
+ if (e) {
return &e->pair.data;
+ }
return nullptr;
}
_FORCE_INLINE_ const TData *getptr(const TKey &p_key) const {
-
- if (unlikely(!hash_table))
+ if (unlikely(!hash_table)) {
return nullptr;
+ }
const Element *e = const_cast<Element *>(get_element(p_key));
- if (e)
+ if (e) {
return &e->pair.data;
+ }
return nullptr;
}
@@ -343,9 +330,9 @@ public:
template <class C>
_FORCE_INLINE_ TData *custom_getptr(C p_custom_key, uint32_t p_custom_hash) {
-
- if (unlikely(!hash_table))
+ if (unlikely(!hash_table)) {
return nullptr;
+ }
uint32_t hash = p_custom_hash;
uint32_t index = hash & ((1 << hash_table_power) - 1);
@@ -353,10 +340,8 @@ public:
Element *e = hash_table[index];
while (e) {
-
/* checking hash first avoids comparing key, which may take longer */
if (e->hash == hash && Comparator::compare(e->pair.key, p_custom_key)) {
-
/* the pair exists in this hashtable, so just update data */
return &e->pair.data;
}
@@ -369,9 +354,9 @@ public:
template <class C>
_FORCE_INLINE_ const TData *custom_getptr(C p_custom_key, uint32_t p_custom_hash) const {
-
- if (unlikely(!hash_table))
+ if (unlikely(!hash_table)) {
return nullptr;
+ }
uint32_t hash = p_custom_hash;
uint32_t index = hash & ((1 << hash_table_power) - 1);
@@ -379,10 +364,8 @@ public:
const Element *e = hash_table[index];
while (e) {
-
/* checking hash first avoids comparing key, which may take longer */
if (e->hash == hash && Comparator::compare(e->pair.key, p_custom_key)) {
-
/* the pair exists in this hashtable, so just update data */
return &e->pair.data;
}
@@ -398,9 +381,9 @@ public:
*/
bool erase(const TKey &p_key) {
-
- if (unlikely(!hash_table))
+ if (unlikely(!hash_table)) {
return false;
+ }
uint32_t hash = Hasher::hash(p_key);
uint32_t index = hash & ((1 << hash_table_power) - 1);
@@ -408,12 +391,9 @@ public:
Element *e = hash_table[index];
Element *p = nullptr;
while (e) {
-
/* checking hash first avoids comparing key, which may take longer */
if (e->hash == hash && Comparator::compare(e->pair.key, p_key)) {
-
if (p) {
-
p->next = e->next;
} else {
//begin of list
@@ -423,10 +403,11 @@ public:
memdelete(e);
elements--;
- if (elements == 0)
+ if (elements == 0) {
erase_hash_table();
- else
+ } else {
check_hash_table();
+ }
return true;
}
@@ -444,14 +425,14 @@ public:
inline TData &operator[](const TKey &p_key) { //assignment
Element *e = nullptr;
- if (!hash_table)
+ if (!hash_table) {
make_hash_table(); // if no table, make one
- else
+ } else {
e = const_cast<Element *>(get_element(p_key));
+ }
/* if we made it up to here, the pair doesn't exist, create */
if (!e) {
-
e = create_element(p_key);
CRASH_COND(!e);
check_hash_table(); // perform mantenience routine
@@ -476,14 +457,13 @@ public:
*
*/
const TKey *next(const TKey *p_key) const {
-
- if (unlikely(!hash_table))
+ if (unlikely(!hash_table)) {
return nullptr;
+ }
if (!p_key) { /* get the first key */
for (int i = 0; i < (1 << hash_table_power); i++) {
-
if (hash_table[i]) {
return &hash_table[i]->pair.key;
}
@@ -501,7 +481,6 @@ public:
uint32_t index = e->hash & ((1 << hash_table_power) - 1);
index++;
for (int i = index; i < (1 << hash_table_power); i++) {
-
if (hash_table[i]) {
return &hash_table[i]->pair.key;
}
@@ -515,23 +494,18 @@ public:
}
inline unsigned int size() const {
-
return elements;
}
inline bool empty() const {
-
return elements == 0;
}
void clear() {
-
/* clean up */
if (hash_table) {
for (int i = 0; i < (1 << hash_table_power); i++) {
-
while (hash_table[i]) {
-
Element *e = hash_table[i];
hash_table[i] = e->next;
memdelete(e);
@@ -541,27 +515,20 @@ public:
memdelete_arr(hash_table);
}
- hash_table = 0;
+ hash_table = nullptr;
hash_table_power = 0;
elements = 0;
}
void operator=(const HashMap &p_table) {
-
copy_from(p_table);
}
- HashMap() {
- hash_table = nullptr;
- elements = 0;
- hash_table_power = 0;
- }
-
void get_key_value_ptr_array(const Pair **p_pairs) const {
- if (unlikely(!hash_table))
+ if (unlikely(!hash_table)) {
return;
+ }
for (int i = 0; i < (1 << hash_table_power); i++) {
-
Element *e = hash_table[i];
while (e) {
*p_pairs = &e->pair;
@@ -572,10 +539,10 @@ public:
}
void get_key_list(List<TKey> *p_keys) const {
- if (unlikely(!hash_table))
+ if (unlikely(!hash_table)) {
return;
+ }
for (int i = 0; i < (1 << hash_table_power); i++) {
-
Element *e = hash_table[i];
while (e) {
p_keys->push_back(e->pair.key);
@@ -584,17 +551,13 @@ public:
}
}
- HashMap(const HashMap &p_table) {
-
- hash_table = nullptr;
- elements = 0;
- hash_table_power = 0;
+ HashMap() {}
+ HashMap(const HashMap &p_table) {
copy_from(p_table);
}
~HashMap() {
-
clear();
}
};
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