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template <typename T>
struct PtrSet {
static_assert(TypeIsPointer<T>::value || TypeIsPtrSizedInteger<T>::value, "PtrSet::T must be a pointer");
static constexpr uintptr TOMBSTONE = ~(uintptr)(0ull);
T * keys;
usize count;
usize capacity;
};
template <typename T> gb_internal void ptr_set_init (PtrSet<T> *s, isize capacity = 16);
template <typename T> gb_internal void ptr_set_destroy(PtrSet<T> *s);
template <typename T> gb_internal T ptr_set_add (PtrSet<T> *s, T ptr);
template <typename T> gb_internal bool ptr_set_update (PtrSet<T> *s, T ptr); // returns true if it previously existed
template <typename T> gb_internal bool ptr_set_exists (PtrSet<T> *s, T ptr);
template <typename T> gb_internal void ptr_set_remove (PtrSet<T> *s, T ptr);
template <typename T> gb_internal void ptr_set_clear (PtrSet<T> *s);
gb_internal gbAllocator ptr_set_allocator(void) {
return heap_allocator();
}
template <typename T>
gb_internal void ptr_set_init(PtrSet<T> *s, isize capacity) {
GB_ASSERT(s->keys == nullptr);
if (capacity != 0) {
capacity = next_pow2_isize(gb_max(16, capacity));
s->keys = gb_alloc_array(ptr_set_allocator(), T, capacity);
// This memory will be zeroed, no need to explicitly zero it
}
s->count = 0;
s->capacity = capacity;
}
template <typename T>
gb_internal void ptr_set_destroy(PtrSet<T> *s) {
gb_free(ptr_set_allocator(), s->keys);
s->keys = nullptr;
s->count = 0;
s->capacity = 0;
}
template <typename T>
gb_internal isize ptr_set__find(PtrSet<T> *s, T ptr) {
GB_ASSERT(ptr != 0);
if (s->count != 0) {
#if 0
for (usize i = 0; i < s->capacity; i++) {
if (s->keys[i] == ptr) {
return i;
}
}
#else
u32 hash = ptr_map_hash_key(ptr);
usize mask = s->capacity-1;
usize hash_index = cast(usize)hash & mask;
for (usize i = 0; i < s->capacity; i++) {
T key = s->keys[hash_index];
if (key == ptr) {
return hash_index;
} else if (key == 0) {
return -1;
}
hash_index = (hash_index+1)&mask;
}
#endif
}
return -1;
}
template <typename T>
gb_internal bool ptr_set__full(PtrSet<T> *s) {
return 0.75f * s->capacity <= s->count;
}
template <typename T>
gb_internal gb_inline void ptr_set_grow(PtrSet<T> *old_set) {
if (old_set->capacity == 0) {
ptr_set_init(old_set);
return;
}
PtrSet<T> new_set = {};
ptr_set_init(&new_set, gb_max(old_set->capacity<<1, 16));
for (T ptr : *old_set) {
bool was_new = ptr_set_update(&new_set, ptr);
GB_ASSERT(!was_new);
}
GB_ASSERT(old_set->count == new_set.count);
ptr_set_destroy(old_set);
*old_set = new_set;
}
template <typename T>
gb_internal gb_inline bool ptr_set_exists(PtrSet<T> *s, T ptr) {
return ptr_set__find(s, ptr) >= 0;
}
template <typename T>
gb_internal bool ptr_set_update(PtrSet<T> *s, T ptr) { // returns true if it previously existsed
if (ptr_set_exists(s, ptr)) {
return true;
}
if (s->keys == nullptr) {
ptr_set_init(s);
} else if (ptr_set__full(s)) {
ptr_set_grow(s);
}
GB_ASSERT(s->count < s->capacity);
GB_ASSERT(s->capacity >= 0);
usize mask = s->capacity-1;
u32 hash = ptr_map_hash_key(ptr);
usize hash_index = (cast(usize)hash) & mask;
GB_ASSERT(hash_index < s->capacity);
for (usize i = 0; i < s->capacity; i++) {
T *key = &s->keys[hash_index];
GB_ASSERT(*key != ptr);
if (*key == (T)PtrSet<T>::TOMBSTONE || *key == 0) {
*key = ptr;
s->count++;
return false;
}
hash_index = (hash_index+1)&mask;
}
GB_PANIC("ptr set out of memory");
return false;
}
template <typename T>
gb_internal T ptr_set_add(PtrSet<T> *s, T ptr) {
ptr_set_update(s, ptr);
return ptr;
}
template <typename T>
gb_internal void ptr_set_remove(PtrSet<T> *s, T ptr) {
isize index = ptr_set__find(s, ptr);
if (index >= 0) {
GB_ASSERT(s->count > 0);
s->keys[index] = (T)PtrSet<T>::TOMBSTONE;
s->count--;
}
}
template <typename T>
gb_internal gb_inline void ptr_set_clear(PtrSet<T> *s) {
s->count = 0;
gb_zero_size(s->keys, s->capacity*gb_size_of(T));
}
template <typename T>
struct PtrSetIterator {
PtrSet<T> *set;
usize index;
PtrSetIterator<T> &operator++() noexcept {
for (;;) {
++index;
if (set->capacity == index) {
return *this;
}
T key = set->keys[index];
if (key != 0 && key != (T)PtrSet<T>::TOMBSTONE) {
return *this;
}
}
}
bool operator==(PtrSetIterator<T> const &other) const noexcept {
return this->set == other.set && this->index == other.index;
}
operator T *() const {
return &set->keys[index];
}
};
template <typename T>
gb_internal PtrSetIterator<T> begin(PtrSet<T> &set) noexcept {
usize index = 0;
while (index < set.capacity) {
T key = set.keys[index];
if (key != 0 && key != (T)PtrSet<T>::TOMBSTONE) {
break;
}
index++;
}
return PtrSetIterator<T>{&set, index};
}
template <typename T>
gb_internal PtrSetIterator<T> end(PtrSet<T> &set) noexcept {
return PtrSetIterator<T>{&set, set.capacity};
}
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