| Re: Speaking of RESTORING [message #23047] |
Fri, 29 December 2000 09:29 |
John-David T. Smith
Messages: 384
Registered: January 2000
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Senior Member |
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David Fanning wrote:
>
> Folks,
>
> While we are on the topic of restoring SAVE files,
> have you noticed the new RESTORED_OBJECTS keyword
> on the RESTORE command? You can get a list of saved
> object references. This should make it much easier to
> re-compile the object methods. :-)
That's been around for a while, since 5.2 maybe (?). In fact, that's how the
original version of resolve_object worked (though I think it was called
restore_object then).
Not to belabor this point, but the issue at hand is that you need to have
defined the class *before* you restore the object (which has the side effect of
defining it using a potentially out of date definition). Hence the whole
resolve_object, CLASS=class formalism. And hence Craig's efforts to parse the
save file for class information prior to restoring it (to obviate apriori
knowledge of the object's class).
By the way, there are two ways to get the object (suppose only one), in the SAVE
file:
restore, RESTORE_OBJECTS=obj
or simply
restore
with the variable name of the object reference known. This is most convenient
inside of an object method itself, when the object SAVE'd is called "self". The
current object ref "self" will be overwritten (think of self as a
pass-by-reference extra argument to all methods). This can obviously be
dangerous, so be careful.
JD
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| Re: Speaking of RESTORING [message #23054 is a reply to message #23047] |
Wed, 27 December 2000 08:50  |
Pavel A. Romashkin
Messages: 531
Registered: November 2000
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Senior Member |
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I think that in that recent thread somebody did point this one out. I
guess it indicates people do read manuals, even though they complain
about them, huh?
Cheers,
Pavel
David Fanning wrote:
>
> Folks,
>
> While we are on the topic of restoring SAVE files,
> have you noticed the new RESTORED_OBJECTS keyword
> on the RESTORE command? You can get a list of saved
> object references. This should make it much easier to
> re-compile the object methods. :-)
>
> Cheers,
>
> David
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