Re: Holes
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- Subject: Re: Holes
- From: steve donovan <steve.j.donovan@...>
- Date: 2010年12月14日 07:52:46 +0200
On Tue, Dec 14, 2010 at 7:44 AM, Mark Hamburg <mark@grubmah.com> wrote:
> Credit where do (at least for beating me to posting), I see Steve Donovan also proposed modifying the core to better support a null value.
Yes, but the Devil is in the details - thanks for fleshing the idea
out. Yes, it does have to be a specially-marked table, and only then
does HOLE get used internally.
So rawset(t,1,nil) actually removes [1], as opposed to t[1] = nil
which inserts HOLE.
Of course, such magic can't help in the case of 'accidental sparse arrays'
t[I1] = val1
t[I2] = val2
...
where I1,I2 may not cover the whole range
in which case it is wise to preallocate the array
for i = 1,size do t[i] = nil end
(This is good practice anyway, except now nil assignment is fine...)
I'm also concerned about the performance implications - probably only
one way to find out!
steve d.