AdjacentDifferenceCopy not setting temp_storage_bytes.

[vince-streamhpc]

Calling AdjacentDifferenceCopy with nullptr to determine the storage size needed, does not set the temp_storage_bytes value.

template <bool ReadLeft,
          typename InputIteratorT,
          typename OutputIteratorT,
          typename DifferenceOpT,
          typename NumItemsT>
void AdjacentDifferenceCopy(InputIteratorT input,
                            OutputIteratorT output,
                            DifferenceOpT difference_op,
                            NumItemsT num_items)
{
  std::size_t temp_storage_bytes; // Will stay uninitialized after calling:

  AdjacentDifferenceCopy<ReadLeft>(nullptr,
                                   temp_storage_bytes,
                                   input,
                                   output,
                                   difference_op,
                                   num_items);

  thrust::device_vector<std::uint8_t> temp_storage(temp_storage_bytes); // Crashes because temp_storage_bytes is uninitialized and thus contains likely a very large random value
  AdjacentDifferenceCopy<ReadLeft>(thrust::raw_pointer_cast(
                                     temp_storage.data()),
                                   temp_storage_bytes,
                                   input,
                                   output,
                                   difference_op,
                                   num_items);
}

[gevtushenko]

@vince-streamhpc thank you for noticing this! I've created PR with a fix.