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#define arr_declaration(arr_type, type, prefix) typedef struct { \
type *data; \
size_t cap; \
size_t len; \
} arr_type; \
static void prefix##create(arr_type *arr) { \
arr->data = NULL; \
arr->cap = 0; \
arr->len = 0; \
} \
static void prefix##reserve(arr_type *arr, size_t n) { \
arr->data = err_realloc(arr->data, n * sizeof(*arr->data)); \
arr->cap = n; \
} \
static void prefix##add(arr_type *arr, type *item) { \
if (arr->len >= arr->cap) { \
prefix##reserve(arr, 2 * arr->len + 2); \
} \
arr->data[arr->len++] = *item; \
} \
static void prefix##clear(arr_type *arr) { \
free(arr->data); \
arr->data = NULL; \
arr->cap = 0; \
arr->len = 0; \
}
#define arr_foreach(arr, type, var) for (type *var = (arr).data, *arr_iterate_last_ = (arr).data + ((arr).len - 1); var; (var == arr_iterate_last_) ? var = NULL : var++)
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