Re: state of the Lua nation on resource cleanup

[Mark Hamburg <mark@...>]

And I should perhaps have mentioned the more general patterns:

	io.with_openfile_do( filepath, function( file )
		-- do stuff
	end )

And

	io.with_newfile_do( filepath, function( file )
		-- do stuff
	end )

The former opens the file if it already exists and hands it to the  
function for processing. The latter creates the file and hands it to  
the function for processing. If the function fails, it deletes the file.

So, a couple of questions to ask are:

* How expensive is it to generate the closures that this sort of style  
promotes?

* Are the cases where we need to do this sufficiently rare that they  
are simply the job of the library writer or are they going to be  
common enough and ad hoc enough that library writers are unlikely to  
cover them all?

Mark