Cast ptr/len to D-style array

[James Blachly]

I work a lot with C functions, many of which yield pointer + length.

Is there a way to cast this or materialize a D-style array backed by the 
already allocated data (with length) to avoid copies which slow things down?

I recognize memory management is a complication. Typically, I would be 
responsible for free'ing the array later.

Thanks in advance