Re: game developers?
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- Subject: Re: game developers?
- From: Steve Dekorte <steve@...>
- Date: 2000年7月31日 14:53:50 -0700
David Jeske <jeske@chat.net> wrote:
> Solutions that seem useful to me would be:
> - allowing "0" to be considered false
> - creating a "real false" value, which looks like nil, but takes
> up space.
How about a tagmethod for boolean:
----------
None = {}
noneTag = newtag()
settagmethod( noneTag, "boolean", function () return nil end)
settag(None, noneTag)
----------
Now when we have:
if aTable.a then
...
end
If "a" is None or nil, then the "if" evaluates a false
otherwise it evaluates to true. "None" could then be used
as the false boolean (unlike nil) can hold a place in a table.
Steve