Examples of errors detected by the V1007 diagnostic

V1007. Value from the uninitialized optional is used. It may be an error.

YTsaurus

V1007 [CWE-457] The value from the potentially uninitialized optional 'curBlob' is used. Probably it is a mistake. parallel_file_reader.cpp:241

size_t TParallelFileReader::DoReadWithCallback(void* ptr,
                                               size_t size,
                                               DoReadCallback&& callback)
{
  ....
  std::optional<TBlob> curBlob;

  while (curBlob = ReadNextBatch())
  {
    ....
  }

  if (....)
  {
    return curIdx;
  }
  else
  {
    size_t prevIdx = curIdx - curBlob->Size(); // <=
    Y_VERIFY(!BatchTail_);
    Y_VERIFY(curBlob.has_value());             // <=

    BatchTail_ = curBlob->SubBlob(size - prevIdx, curBlob->Size());
    return size;
  }
}