add find/find_pointer to array types

array/dynamic_array.jai

@@ -29,6 +29,15 @@ reset :: inline (arr: *[..]$T) {
    arr.count = 0;
 }
 
+find :: (a: [..]$T, $predicate: (T) -> bool) -> T, bool, int {
+   for a if inline predicate(it) return it, true, it_index;
+   return mem.undefined_of(T), false, -1;
+}
+
+find_pointer :: (a: *[..]$T, $predicate: (T) -> bool) -> *T, bool, int {
+   for * a if inline predicate(it.*) return it, true, it_index;
+   return null, false, -1;
+}
 
 #scope_file;
  

array/stable_array.jai

@@ -51,6 +51,16 @@ reset :: (a: *Stable_Array) {
    a.chunks.count = 0;
 }
 
+find :: (a: Stable_Array, $predicate: (a.T) -> bool) -> a.T, bool, int {
+   for a if inline predicate(it) return it, true, it_index;
+   return mem.undefined_of(a.T), false, -1;
+}
+
+find_pointer :: (a: *Stable_Array, $predicate: (a.T) -> bool) -> *a.T, bool, int {
+   for * a if inline predicate(it.*) return it, true, it_index;
+   return null, false, -1;
+}
+
 operator [] :: (a: Stable_Array, index: int, loc := #caller_location) -> a.T #no_abc {
    cidx := index / a.items_per_chunk;
    iidx := index % a.items_per_chunk;
@@ -164,6 +174,17 @@ try_lazy_init :: (a: *Stable_Array) {
 
       for * a it.* = 1;
       for   a test.expect(t, it == 1);
+
+      ptr, ok, idx := find_pointer(*a, v => v == 1);
+      test.expect(t, ok);
+      test.expect(t, idx == 0);
+      test.expect(t, ptr == *a[0]);
+
+      a[a.count - 1] = -1;
+
+      _, ok, idx = find(a, v => v == -1);
+      test.expect(t, ok);
+      test.expect(t, idx == a.count - 1);
    });
 
    test.run("stability", t => {

array/static_array.jai

@@ -33,6 +33,16 @@ reset :: inline (a: *Static_Array) #no_abc {
    a.count = 0;
 }
 
+find :: (a: Static_Array, $predicate: (a.T) -> bool) -> a.T, bool, int {
+   for a if inline predicate(it) return it, true, it_index;
+   return mem.undefined_of(a.T), false, -1;
+}
+
+find_pointer :: (a: *Static_Array, $predicate: (a.T) -> bool) -> *a.T, bool, int {
+   for * a if inline predicate(it.*) return it, true, it_index;
+   return null, false, -1;
+}
+
 operator [] :: inline (a: Static_Array, $$index: int, loc := #caller_location) -> a.T #no_abc {
    meta.check_bounds(index, a.count, loc = loc);
    return a.items[index];
@@ -97,5 +107,11 @@ basic :: #import "Basic"; // @future
 
       append(*a, 10, 20, 30);
       test.expect(t, a.count == 3, "count: %", a.count);
+
+      _, ok := find(a, v => v == 10);
+      test.expect(t, ok);
+
+      _, ok = find_pointer(*a, v => v == 20);
+      test.expect(t, ok);
    });
 }

memory/module.jai

@@ -18,8 +18,13 @@ default_of :: ($T: Type) -> T #expand {
    return default;
 }
 
+undefined_of :: ($T: Type) -> T #expand {
+   uninit: T = ---;
+   return uninit;
+}
+
 zero_of :: ($T: Type) -> T #expand {
-   zero: T = ---;
+   zero := undefined_of(T);
    memset(*zero, 0, size_of(T));
    return zero;
 }