Came up with a basic structure for a dynamic array

src/dynamic_array.c

@@ -0,0 +1,27 @@
+#include "dynamic_array.h"
+#include "arena_allocator.h"
+#include <assert.h>
+
+wn_darr *wn_darr_init(Arena *arena, size_t object_size, size_t object_count) {
+  wn_darr *darr = arena_alloc(arena, sizeof(wn_darr));
+  *darr =
+      (wn_darr){.metadata = arena_init(arena, object_count * sizeof(void *)),
+                .data = arena_init(arena, object_count * object_size),
+                .count = 0};
+
+  assert(darr->metadata != NULL);
+  assert(darr->data != NULL);
+
+  return darr;
+}
+
+void wn_darr_deinit(wn_darr *dynamic_array) {
+  assert(dynamic_array->metadata != NULL);
+  assert(dynamic_array->data != NULL);
+
+  arena_deinit(dynamic_array->metadata);
+  arena_deinit(dynamic_array->data);
+}
+
+// TODO: This
+void wn_darr_append(wn_darr *dynamic_array, void *data, size_t data_size) {}

src/dynamic_array.h

@@ -0,0 +1,14 @@
+#pragma once
+#include "arena_allocator.h"
+#include <stddef.h>
+
+typedef struct wn_darr {
+  Arena *metadata;
+  Arena *data;
+  size_t count;
+} wn_darr;
+
+wn_darr *wn_darr_init(Arena *arena, size_t object_size, size_t object_number);
+void wn_darr_deinit(wn_darr *dynamic_array);
+
+void wn_darr_append(wn_darr *dynamic_array, void *data, size_t data_size);