[vtkusers] Pass data in reader without copying?

[Elvis Stansvik]

If I'm writing my own custom volume reader, and I have the read data in
memory (say as a float*). If I know the data is in the right format/layout,
can I somehow pass ownership of that data to the output of the algorithm
without incurring a copy?

I've been looking at some of the simpler readers that come with VTK, but
all of them seems to copy the read data to the output (?).

Thanks,
Elvis
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