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- Subject: Re: state of the Lua nation on resource cleanup
- From: Roberto Ierusalimschy <roberto@...>
- Date: Tue, 17 Feb 2009 14:01:26 -0300
> > What's wrong with Joonas Pihlaja's proposal?
> > do with f, g = io.open("src.txt","r"), io.open("dst.txt",w")
> > for l in f:lines() do
> > ...
> > g:write(l)
> > end
> > end
> > (Probably with a different syntax...)
> I've been using it in metalua for a while (syntax "with <var_list> =
> <values_list> do <scoped_statements> end") for some time, with the
> convention that the protected variables must have a ":close()" disposal
> method, and I'm pretty happy with it.
I do not see why the need for the <scoped_statements>. It would be
simpler to add only a new form of locals. Something like
local finalized f, g = ...
that calls ":close()" (or __gc??) when it goes out of scope. Of course,
you can (should?) use a conventional do-end around it:
do local finalized f, g = ...
But the do-end is not part of the syntax.