Re: Metatables for numbers
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- Subject: Re: Metatables for numbers
- From: Greg Hill <tghill@...>
- Date: 2008年6月28日 21:11:21 +0000 (UTC)
> You could patch Lua, but it's that way for a reason. Speed. Having to check
> metatables for every single addition, having to remove the optimized for
> loops and constant folding, etc. Possibly worse still is what the functions
> would look like.. having to add a rawadd, rawsub, rawmul... yuck.
I agree that this would ugly. I'm just trying to understand metatables better.
I was trying to use metatables to create a abstract syntax tree (AST) like lisp
from lua code. I was getting fairly far until I hit this snag for numbers and
boolean variables. If my code only uses tables or a table for 1 of the 2
operands for binary operations, it works fine. With an AST, I could do some
static code analysis.