this->size = bitsToWords(this->items * this->item_bits);
usint* buffer = new usint[this->size];
memset(buffer, 0, this->size * sizeof(usint));
this->size = bitsToWords(this->items * this->item_bits);
usint* buffer = new usint[this->size];
memset(buffer, 0, this->size * sizeof(usint));