std::vector<char> piece_data = this->storage[piece_idx];

        // init vector of piece_size size
        if (piece_data.empty()) {
            std::cout << "Allocating vector of size " << this->piece_size << " for piece " << piece_idx << std::endl;
            piece_data.resize(this->piece_size);
        }

std::vector<char> piece_data = this->storage[piece_idx];

        // init vector of piece_size size
        if (piece_data.empty()) {
            std::cout << "Allocating vector of size " << this->piece_size << " for piece " << piece_idx << std::endl;
            piece_data.resize(this->piece_size);
        }