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typedef struct {
void *data;
void *last;
size_t len;
size_t cap;
size_t item_sz;
} Array;
static void arr_create(Array *arr, size_t item_sz) {
arr->len = arr->cap = 0;
arr->item_sz = item_sz;
arr->data = NULL;
arr->last = NULL;
}
static void arr_reserve(Array *arr, size_t n) {
arr->cap = n;
arr->data = realloc(arr->data, arr->item_sz * arr->cap);
arr->last = (void*)((char*)arr->data + arr->item_sz * (arr->len - 1));
}
static void *arr_add(Array *arr) {
if (arr->len >= arr->cap) {
arr_reserve(arr, (arr->cap + 1) * 2);
}
arr->len++;
arr->last = (char*)arr->last + arr->item_sz;
void *item = arr->last;
return item;
}
static void arr_clear(Array *arr) {
free(arr->data);
arr->len = arr->cap = 0;
arr->data = NULL;
arr->last = NULL;
}
static void arr_remove_last(Array *arr) {
/* OPTIM (memory): Shorten array. */
arr->len--;
if (arr->len) {
arr->last = (char*)arr->last - arr->item_sz;
} else {
arr_clear(arr);
}
}
static void arr_free(Array *arr) {
free(arr->data);
}
#define arr_foreach(arr, type, var) for (type *var = (arr)->data; var; var == (arr)->last ? var = NULL : var++)
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