Method DoNext

util/stream/buffer.cpp:13–21

    virtual ~TImpl() = default;

    inline size_t DoNext(void** ptr) {
        if (Data_.Avail() == 0) {
            Data_.Reserve(FastClp2(Data_.Capacity() + MinBufferGrowSize));
        }
        size_t previousSize = Data_.size();
        Data_.Resize(Data_.Capacity());
        *ptr = Data_.Begin() + previousSize;
        return Data_.Size() - previousSize;
    }

    inline void DoUndo(size_t len) {
        Y_ABORT_UNLESS(len <= Data_.Size(), "trying to undo more bytes than actually written");