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Re: Bug in Inspector?
- To: djskrien@COLBY.EDU (Dale J. Skrien)
- Subject: Re: Bug in Inspector?
- From: email@example.com (Bill St. Clair)
- Date: Tue, 8 Sep 1992 17:04:44 -0500
- Cc: info-mcl
>Sometimes when I inspect a list of CLOS objects with the inspector, the
>HEX values associated with the objects seems to change arbitrarily. Here's
>a simple example:
>? (defvar xx (list (make-instance 'view) (make-instance 'view)))
>(#<VIEW #xB5AD69> #<VIEW #xB5ADE9>)
>? (inspect 'xx)
>#<INSPECTOR-WINDOW "XX" #xB5AED1>
>At this point, the inspector window opens and shows that the value of xx is
>a list of two views. If I double-click on that list of two views in the
>inspector window to inspect these views, I get a new inspector window
>for the list. So far, so good.
> However, now I close this new inspector window and double-click
>on the list of two views again in the original inspector window to reopen
>the new inspector window for the list. I repeat this closing and opening
>the inspector window for the list of two views several times. Eventually,
>the inspector window for the list of two views shows different HEX values
>associated with the two views. For example, I got
> (#<VIEW #xB5A3C1> #<VIEW #xB5A431>)
>Does this mean the objects moved (due to garbage collection or some
>other reason)? I have the ephemeral garbage collector on.
The hex number in the print string for views (and many other objects) is a
memory address. Hence, as you surmised, it may change whenever garbage
collection happens, ephemeral or otherwise.