Re: equivalent of a "setlocal" tag method
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- Subject: Re: equivalent of a "setlocal" tag method
- From: Aaron Kamienski <aaronk@...>
- Date: 2000年7月13日 17:17:40 -0500
Luiz Henrique de Figueiredo wrote:
> >It would be nice if there were set/getlocal tag methods,
>
> There are [sic] such tag methods because of performance.
That is unfortunate that their introduction would introduce such a hit.
What I really appreciate about this language is the sheer amount of
stuff that you can get done "behind the scenes" using tag methods;
while maintaining simple syntax! It's too bad that this means one
cannot use such simple syntax in this case.
[At this point I'm not too worried about speed, but am focused more
on codesize and simplicity of syntax for non-programmers.]
> >if locals could be accessed via an implicit local table (can they?).
>
> Yes, via the debug API (or debug library in Lua).
> See lua_getlocal/lua_setlocal and getlocal/setlocal.
> But heed this warning in the manual:
>
> You should exert great care when using this library. The functions
> provided here should be used exclusively for debugging and similar
> tasks (e.g., profiling). Please resist the temptation to use them as a
> usual programming tool. They are slow and violate some (otherwise)
> secure aspects of the language (e.g., privacy of local variables).
I guess that is why I missed those routines. I have avoided the
debug library because of that very same warning in the documentation!
thanks,
ajk