1 files changed, 116 insertions, 0 deletions
diff --git a/src/array.cpp b/src/array.cpp
new file mode 100644
index 000000000..d8b8e9ef3
--- /dev/null
+++ b/src/array.cpp
@@ -0,0 +1,116 @@
+#define ARRAY_GROW_FORMULA(x) (2*(x) + 8)
+
+template <typename T>
+struct Array {
+	gbAllocator allocator;
+	T *data;
+	isize count;
+	isize capacity;
+
+	T &operator[](isize index) {
+		if (count > 0) {
+			GB_ASSERT_MSG(0 <= index && index < count, "Index out of bounds");
+		}
+		return data[index];
+	}
+
+	T const &operator[](isize index) const {
+		if (count > 0) {
+			GB_ASSERT_MSG(0 <= index && index < count, "Index out of bounds");
+		}
+		return data[index];
+	}
+};
+
+template <typename T> void array_init        (Array<T> *array, gbAllocator a, isize init_capacity = 8);
+template <typename T> void array_free        (Array<T> *array);
+template <typename T> void array_add         (Array<T> *array, T const &t);
+template <typename T> T    array_pop         (Array<T> *array);
+template <typename T> void array_clear       (Array<T> *array);
+template <typename T> void array_reserve     (Array<T> *array, isize capacity);
+template <typename T> void array_resize      (Array<T> *array, isize count);
+template <typename T> void array_set_capacity(Array<T> *array, isize capacity);
+
+
+template <typename T>
+void array_init(Array<T> *array, gbAllocator a, isize init_capacity) {
+	array->allocator = a;
+	array->data = gb_alloc_array(a, T, init_capacity);
+	array->count = 0;
+	array->capacity = init_capacity;
+}
+
+template <typename T>
+void array_free(Array<T> *array) {
+	gb_free(array->allocator, array->data);
+	array->count = 0;
+	array->capacity = 0;
+}
+
+template <typename T>
+void array__grow(Array<T> *array, isize min_capacity) {
+	isize new_capacity = ARRAY_GROW_FORMULA(array->capacity);
+	if (new_capacity < min_capacity) {
+		new_capacity = min_capacity;
+	}
+	array_set_capacity(array, new_capacity);
+}
+
+template <typename T>
+void array_add(Array<T> *array, T const &t) {
+	if (array->capacity < array->count+1) {
+		array__grow(array, 0);
+	}
+	array->data[array->count] = t;
+	array->count++;
+}
+
+template <typename T>
+T array_pop(Array<T> *array) {
+	GB_ASSERT(array->count > 0);
+	array->count--;
+	return array->data[array->count];
+}
+
+template <typename T>
+void array_clear(Array<T> *array) {
+	array->count = 0;
+}
+
+template <typename T>
+void array_reserve(Array<T> *array, isize capacity) {
+	if (array->capacity < capacity) {
+		array_set_capacity(array, capacity);
+	}
+}
+
+template <typename T>
+void array_resize(Array<T> *array, isize count) {
+	if (array->capacity < count) {
+		array__grow(array, count);
+	}
+	array->count = count;
+}
+
+template <typename T>
+void array_set_capacity(Array<T> *array, isize capacity) {
+	if (capacity == array->capacity) {
+		return;
+	}
+
+	if (capacity < array->count) {
+		array_resize(array, capacity);
+	}
+
+	T *new_data = NULL;
+	if (capacity > 0) {
+		new_data = gb_alloc_array(array->allocator, T, capacity);
+		gb_memmove(new_data, array->data, gb_size_of(T) * array->capacity);
+	}
+	gb_free(array->allocator, array->data);
+	array->data = new_data;
+	array->capacity = capacity;
+}
+
+
+