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@@ -0,0 +1,244 @@
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+package container
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+
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+import "core:mem"
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+import "intrinsics"
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+
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+
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+Set :: struct {
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+ hash: Array(int),
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+ entries: Array(Set_Entry),
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+}
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+
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+Set_Entry :: struct {
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+ key: u64,
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+ next: int,
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+}
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+
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+
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+/*
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+set_init :: proc{
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+ set_init_none,
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+ set_init_cap,
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+}
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+set_delete
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+
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+set_in
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+set_not_in
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+set_add
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+set_remove
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+set_reserve
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+set_clear
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+*/
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+
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+set_init :: proc{set_init_none, set_init_cap};
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+
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+set_init_none :: proc(m: ^Set, allocator := context.allocator) {
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+ m.hash.allocator = allocator;
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+ m.entries.allocator = allocator;
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+}
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+
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+set_init_cap :: proc(m: ^Set, cap: int, allocator := context.allocator) {
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+ m.hash.allocator = allocator;
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+ m.entries.allocator = allocator;
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+ set_reserve(m, cap);
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+}
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+
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+set_delete :: proc(m: Set) {
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+ array_delete(m.hash);
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+ array_delete(m.entries);
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+}
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+
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+
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+set_in :: proc(m: Set, key: u64) -> bool {
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+ return _set_find_or_fail(m, key) >= 0;
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+}
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+set_not_in :: proc(m: Set, key: u64) -> bool {
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+ return _set_find_or_fail(m, key) < 0;
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+}
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+
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+set_add :: proc(m: ^Set, key: u64) {
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+ if array_len(m.hash) == 0 {
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+ _set_grow(m);
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+ }
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+
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+ i := _set_find_or_make(m, key);
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+ if _set_full(m^) {
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+ _set_grow(m);
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+ }
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+}
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+
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+set_remove :: proc(m: ^Set, key: u64) {
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+ fr := _set_find_key(m^, key);
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+ if fr.entry_index >= 0 {
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+ _set_erase(m, fr);
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+ }
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+}
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+
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+
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+set_reserve :: proc(m: ^Set, new_size: int) {
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+ nm: Set;
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+ set_init(&nm, m.hash.allocator);
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+ array_resize(&nm.hash, new_size);
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+ array_reserve(&nm.entries, array_len(m.entries));
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+
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+ for i in 0..<new_size {
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+ array_set(&nm.hash, i, -1);
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+ }
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+ for i in 0..<array_len(m.entries) {
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+ e := array_get(m.entries, i);
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+ set_add(&nm, e.key);
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+ }
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+
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+ set_delete(m^);
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+ m^ = nm;
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+}
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+
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+set_clear :: proc(m: ^Set) {
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+ array_clear(&m.hash);
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+ array_clear(&m.entries);
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+}
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+
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+
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+set_equal :: proc(a, b: Set) -> bool {
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+ a_entries := array_slice(a.entries);
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+ b_entries := array_slice(b.entries);
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+ if len(a_entries) != len(b_entries) {
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+ return false;
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+ }
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+ for e in a_entries {
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+ if set_not_in(b, e.key) {
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+ return false;
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+ }
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+ }
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+
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+ return true;
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+}
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+
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+
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+
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+/// Internal
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+
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+_set_add_entry :: proc(m: ^Set, key: u64) -> int {
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+ e: Set_Entry;
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+ e.key = key;
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+ e.next = -1;
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+ idx := array_len(m.entries);
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+ array_push(&m.entries, e);
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+ return idx;
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+}
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+
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+_set_erase :: proc(m: ^Set, fr: Map_Find_Result) {
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+ if fr.entry_prev < 0 {
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+ array_set(&m.hash, fr.hash_index, array_get(m.entries, fr.entry_index).next);
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+ } else {
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+ array_get_ptr(m.entries, fr.entry_prev).next = array_get(m.entries, fr.entry_index).next;
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+ }
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+
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+ if fr.entry_index == array_len(m.entries)-1 {
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+ array_pop_back(&m.entries);
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+ return;
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+ }
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+
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+ array_set(&m.entries, fr.entry_index, array_get(m.entries, array_len(m.entries)-1));
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+ last := _set_find_key(m^, array_get(m.entries, fr.entry_index).key);
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+
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+ if last.entry_prev < 0 {
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+ array_get_ptr(m.entries, last.entry_prev).next = fr.entry_index;
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+ } else {
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+ array_set(&m.hash, last.hash_index, fr.entry_index);
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+ }
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+}
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+
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+
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+_set_find_key :: proc(m: Set, key: u64) -> Map_Find_Result {
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+ fr: Map_Find_Result;
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+ fr.hash_index = -1;
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+ fr.entry_prev = -1;
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+ fr.entry_index = -1;
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+
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+ if array_len(m.hash) == 0 {
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+ return fr;
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+ }
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+
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+ fr.hash_index = int(key % u64(array_len(m.hash)));
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+ fr.entry_index = array_get(m.hash, fr.hash_index);
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+ for fr.entry_index >= 0 {
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+ it := array_get_ptr(m.entries, fr.entry_index);
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+ if it.key == key {
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+ return fr;
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+ }
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+ fr.entry_prev = fr.entry_index;
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+ fr.entry_index = it.next;
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+ }
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+ return fr;
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+}
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+
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+_set_find_entry :: proc(m: ^Set, e: ^Set_Entry) -> Map_Find_Result {
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+ fr: Map_Find_Result;
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+ fr.hash_index = -1;
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+ fr.entry_prev = -1;
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+ fr.entry_index = -1;
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+
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+ if array_len(m.hash) == 0 {
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+ return fr;
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+ }
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+
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+ fr.hash_index = int(e.key % u64(array_len(m.hash)));
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+ fr.entry_index = array_get(m.hash, fr.hash_index);
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+ for fr.entry_index >= 0 {
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+ it := array_get_ptr(m.entries, fr.entry_index);
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+ if it == e {
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+ return fr;
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+ }
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+ fr.entry_prev = fr.entry_index;
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+ fr.entry_index = it.next;
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+ }
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+ return fr;
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+}
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+
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+_set_find_or_fail :: proc(m: Set, key: u64) -> int {
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+ return _set_find_key(m, key).entry_index;
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+}
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+_set_find_or_make :: proc(m: ^Set, key: u64) -> int {
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+ fr := _set_find_key(m^, key);
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+ if fr.entry_index >= 0 {
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+ return fr.entry_index;
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+ }
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+
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+ i := _set_add_entry(m, key);
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+ if fr.entry_prev < 0 {
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+ array_set(&m.hash, fr.hash_index, i);
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+ } else {
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+ array_get_ptr(m.entries, fr.entry_prev).next = i;
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+ }
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+ return i;
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+}
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+
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+
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+_set_make :: proc(m: ^Set, key: u64) -> int {
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+ fr := _set_find_key(m^, key);
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+ i := _set_add_entry(m, key);
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+
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+ if fr.entry_prev < 0 {
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+ array_set(&m.hash, fr.hash_index, i);
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+ } else {
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+ array_get_ptr(m.entries, fr.entry_prev).next = i;
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+ }
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+
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+ array_get_ptr(m.entries, i).next = fr.entry_index;
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+
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+ return i;
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+}
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+
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+
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+_set_full :: proc(m: Set) -> bool {
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+ // TODO(bill): Determine good max load factor
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+ return array_len(m.entries) >= (array_len(m.hash) / 4)*3;
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+}
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+
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+_set_grow :: proc(m: ^Set) {
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+ new_size := array_len(m.entries) * 4 + 7; // TODO(bill): Determine good grow rate
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+ set_reserve(m, new_size);
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+}
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+
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+
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