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But still no difference in either memory footprint or in running time.
This will teach me -- for the umpteenth time -- to optimize before
measuring.
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Turns out to not affect memory utilization or run-time. At all.
But still looks nicer and requires less fudging on our part.
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I forgot to check for nulls before writing prev pointers in doubly
linked lists. Tests were accidentally passing.
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This uncovers an issue with this interface to duplex lists: the caller
needs to check the result and invalidate any other pointers if it's null
(i.e. the list is now empty)
We *could* try to encapsulate the list in a header to help the caller
manage header pointers. But heck, let's see if writing tests helps
call-sites stay on the straight and narrow.
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