Re: Definition of table.insert
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- Subject: Re: Definition of table.insert
- From: Drake Wilson <drake@...>
- Date: Sun, 9 Jan 2011 16:19:41 -0700
Quoth Axel Kittenberger <axkibe@gmail.com>, on 2011年01月10日 00:04:44 +0100:
> Proposal a function table.icopy(table, src, dest, n) which replaces
> the need for insert and remove.
> It copies n integer keys from src to dest. Its inspired by ECMA's
> splice, and for those with C background to behave more like memmove()
> to defined when src and destination slice overlap.
FWIW, I have almost exactly this function in a program of mine, except
I call it _blit, and it has a different signature:
function _blit(dst, dst_first, src, src_first, count)
src_first = src_first or 1
local offset = dst_first - src_first
local src_last = #src
if count then src_last = src_first + count - 1 end
for i = src_first, src_last do dst[i+offset] = src[i] end
return dst
end
And then I can do things like:
function _appendn(dst, src)
return _blit(dst, #dst+1, src, 1, #src)
end
(These are slightly translated from the original form.)
---> Drake Wilson