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2013-08-02
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| 15:00 | • Closed ticket [9d61624b3d]: empty superclass slot is not always equivalent to oo::object plus 5 other changes artifact: 9de2b95c92 user: dkf | |
| 14:58 | [9d61624b3d]: Stop crashes when emptying the superclass slot. check-in: 8e643395a4 user: dkf tags: trunk | |
| 14:37 | • Ticket [9d61624b3d] empty superclass slot is not always equivalent to oo::object status still Open with 3 other changes artifact: ce9ef918f7 user: dkf | |
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2013-07-10
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| 04:52 | • Ticket [9d61624b3d]: 4 changes artifact: dbec366240 user: aku | |
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2013-07-07
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| 22:17 | • New ticket [9d61624b3d]. artifact: 60227c02a4 user: anonymous | |
| Ticket UUID: | 9d61624b3deb9fc676d69a59e0213e61cf8e5fb1 | |||
| Title: | empty superclass slot is not always equivalent to oo::object | |||
| Type: | Bug | Version: | 8.6.0 | |
| Submitter: | anonymous | Created on: | 2013-07-07 22:17:10 | |
| Subsystem: | 35. TclOO Package | Assigned To: | dkf | |
| Priority: | 5 Medium | Severity: | Critical | |
| Status: | Closed | Last Modified: | 2013-08-02 15:00:08 | |
| Resolution: | Fixed | Closed By: | dkf | |
| Closed on: | 2013-08-02 15:00:08 | |||
| Description: |
If you do not define a superclass for $class, then oo::object will be
the superclass of $class. This is explained in the documentation
(of oo::define) as "an empty parent class is equivalent to oo::object".
However, if you do oo::define $class { superclass }, then the superclass
slot is made empty, but does not again become equivalent to oo::object.
A crash can be caused. Example:
% oo::class create fruit {
method eat {} {
puts "yummy!"
}
}
::fruit
% set f [fruit new]
::oo::Obj12
% info object class $f oo::object
1
% info class superclasses fruit
::oo::object
% oo::define fruit { superclass }
% info class superclasses fruit
% info object class $f oo::object
0
% info object isa object $f
1
% $f destroy
impossible to invoke method "destroy": no defined method or unknown method
% info class call fruit destroy
cannot construct any call chain
% $f
Segmentation fault (core dumped)
-Marcel van der Goot
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| User Comments: |
dkf added on 2013-08-02 14:37:40:
Confirmed interactively. Ouch. | |||