become: in VASmalltalk: one way or two way ?
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Marten Feldtmann
Jul 21, 2020, 11:22:06 AM7/21/20
to VA Smalltalk
The method remark says its platform dependent ... so how is it under VA ?
Mariano Martinez Peck
Jul 21, 2020, 11:28:34 AM7/21/20
to VA Smalltalk
Which version are you working with? Because this method has been clarified recently. In 9.2.2 it looks like this:
become: otherObject
"Change all objects that refer to the receiver (via
instance variables) to now refer to @otherObject.
This is termed 'one way' become.
Fail if the receiver is a immediate object:
(anSmallInteger, a Character, true, false, nil)
Arguments:
otherObject - <Object>
Answers:
<Object> self"
<primitive: VMprObjectBecome>
^self primitiveFailed
On Tue, Jul 21, 2020 at 12:22 PM Marten Feldtmann <m.fel...@dimap.de> wrote:
The method remark says its platform dependent ... so how is it under VA ?
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Mariano Martinez Peck
Software Engineer, Instantiations Inc.
Software Engineer, Instantiations Inc.
Marten Feldtmann
Jul 21, 2020, 11:56:07 AM7/21/20
to VA Smalltalk
In my Windows 9.2.2 I have the following remark:
become: otherObject
"Change all objects that refer to the receiver (via
"Change all objects that refer to the receiver (via
instance variables) to now refer to otherObject.
The exact implementation of #become: is platform
dependent. Some implementations may swap the
references of the receiver and otherObject. This is
termed 'two way' become. For 'two way' become, answer
otherObject. Some implementations will only change
the references that originally refer to the receiver
leaving otherObject to be garbage collected. This is
termed 'one way' become. For 'one way' become, Answer
the changed receiver. A third alternative is 'one
way' become, but Answer otherObject. The most
conservative assumption is to assume 'one way' become.
Fail if the receiver is a SmallInteger, a Character, true, false
or nil."
<primitive: VMprObjectBecome>
^self primitiveFailed
The exact implementation of #become: is platform
dependent. Some implementations may swap the
references of the receiver and otherObject. This is
termed 'two way' become. For 'two way' become, answer
otherObject. Some implementations will only change
the references that originally refer to the receiver
leaving otherObject to be garbage collected. This is
termed 'one way' become. For 'one way' become, Answer
the changed receiver. A third alternative is 'one
way' become, but Answer otherObject. The most
conservative assumption is to assume 'one way' become.
Fail if the receiver is a SmallInteger, a Character, true, false
or nil."
<primitive: VMprObjectBecome>
^self primitiveFailed
Mariano Martinez Peck
Jul 21, 2020, 11:58:34 AM7/21/20
to VA Smalltalk
Ups, sorry, my bad, that was integrated for the next release of VAST (not 922). Anyway, I think that answers your question ;)
To view this discussion on the web visit https://groups.google.com/d/msgid/va-smalltalk/e1a286c2-55eb-4f88-9ce4-0ad7d181b60an%40googlegroups.com.
Joachim Tuchel
Jul 22, 2020, 2:25:22 AM7/22/20
to VA Smalltalk
Hi Marten,
this has been discussed here quite recently: https://groups.google.com/g/va-smalltalk/c/39hiC0t5HTg/m/7n6Xg6gsCAAJ
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