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* [Bug c++/52972] New: [4.6] Pure virtual method is called instead of child's method
@ 2012-04-13 11:33 drinob at gmail dot com
2012-04-13 16:24 ` [Bug c++/52972] " pinskia at gcc dot gnu.org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: drinob at gmail dot com @ 2012-04-13 11:33 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52972
Bug #: 52972
Summary: [4.6] Pure virtual method is called instead of child's
method
Classification: Unclassified
Product: gcc
Version: 4.6.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: drinob@gmail.com
Created attachment 27150
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27150
Bug sample
drino@netbook:~/src$ g++ test.cpp
drino@netbook:~/src$ ./a.out
pure virtual method called
terminate called without an active exception
Aborted
^ permalink raw reply [flat|nested] 7+ messages in thread* [Bug c++/52972] Pure virtual method is called instead of child's method 2012-04-13 11:33 [Bug c++/52972] New: [4.6] Pure virtual method is called instead of child's method drinob at gmail dot com @ 2012-04-13 16:24 ` pinskia at gcc dot gnu.org 2012-04-13 16:28 ` redi at gcc dot gnu.org ` (4 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu.org @ 2012-04-13 16:24 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52972 --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-04-13 16:24:07 UTC --- I think you are getting the correct behavior as the vtable for the base class is the current vtable for this. And " return static_cast < Real* > (this);" Does not change the vtable of the return class. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/52972] Pure virtual method is called instead of child's method 2012-04-13 11:33 [Bug c++/52972] New: [4.6] Pure virtual method is called instead of child's method drinob at gmail dot com 2012-04-13 16:24 ` [Bug c++/52972] " pinskia at gcc dot gnu.org @ 2012-04-13 16:28 ` redi at gcc dot gnu.org 2012-04-13 16:28 ` drinob at gmail dot com ` (3 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: redi at gcc dot gnu.org @ 2012-04-13 16:28 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52972 Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution| |INVALID --- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-04-13 16:27:44 UTC --- right, during the base constructor the derived class hasn't been constructed yet and you can't call its virtual functions ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/52972] Pure virtual method is called instead of child's method 2012-04-13 11:33 [Bug c++/52972] New: [4.6] Pure virtual method is called instead of child's method drinob at gmail dot com 2012-04-13 16:24 ` [Bug c++/52972] " pinskia at gcc dot gnu.org 2012-04-13 16:28 ` redi at gcc dot gnu.org @ 2012-04-13 16:28 ` drinob at gmail dot com 2012-04-13 16:35 ` drinob at gmail dot com ` (2 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: drinob at gmail dot com @ 2012-04-13 16:28 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52972 --- Comment #3 from drinob at gmail dot com 2012-04-13 16:28:36 UTC --- Yes, this is my mistake. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/52972] Pure virtual method is called instead of child's method 2012-04-13 11:33 [Bug c++/52972] New: [4.6] Pure virtual method is called instead of child's method drinob at gmail dot com ` (2 preceding siblings ...) 2012-04-13 16:28 ` drinob at gmail dot com @ 2012-04-13 16:35 ` drinob at gmail dot com 2012-04-13 17:28 ` redi at gcc dot gnu.org 2012-04-13 17:44 ` drinob at gmail dot com 5 siblings, 0 replies; 7+ messages in thread From: drinob at gmail dot com @ 2012-04-13 16:35 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52972 --- Comment #4 from drinob at gmail dot com 2012-04-13 16:35:35 UTC --- But it seems to work in g++ 4.3 (which is used at ideone.com): http://ideone.com/zy5R4 Is that behavior uncorrect? ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/52972] Pure virtual method is called instead of child's method 2012-04-13 11:33 [Bug c++/52972] New: [4.6] Pure virtual method is called instead of child's method drinob at gmail dot com ` (3 preceding siblings ...) 2012-04-13 16:35 ` drinob at gmail dot com @ 2012-04-13 17:28 ` redi at gcc dot gnu.org 2012-04-13 17:44 ` drinob at gmail dot com 5 siblings, 0 replies; 7+ messages in thread From: redi at gcc dot gnu.org @ 2012-04-13 17:28 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52972 --- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-04-13 17:27:33 UTC --- The standard says "Member functions can be called from a constructor (or destructor) of an abstract class; the effect of making a virtual call to a pure virtual function directly or indirectly for the object being created (or destroyed) from such a constructor (or destructor) is undefined." The program has undefined behaviour, there is no correct or incorrect behaviour for the compiler. Whatever the compiler does with your program does is valid. Including setting fire to your computer. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/52972] Pure virtual method is called instead of child's method 2012-04-13 11:33 [Bug c++/52972] New: [4.6] Pure virtual method is called instead of child's method drinob at gmail dot com ` (4 preceding siblings ...) 2012-04-13 17:28 ` redi at gcc dot gnu.org @ 2012-04-13 17:44 ` drinob at gmail dot com 5 siblings, 0 replies; 7+ messages in thread From: drinob at gmail dot com @ 2012-04-13 17:44 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52972 --- Comment #6 from drinob at gmail dot com 2012-04-13 17:43:44 UTC --- Thank you for your explanation. Now it's all clear. ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2012-04-13 17:44 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2012-04-13 11:33 [Bug c++/52972] New: [4.6] Pure virtual method is called instead of child's method drinob at gmail dot com 2012-04-13 16:24 ` [Bug c++/52972] " pinskia at gcc dot gnu.org 2012-04-13 16:28 ` redi at gcc dot gnu.org 2012-04-13 16:28 ` drinob at gmail dot com 2012-04-13 16:35 ` drinob at gmail dot com 2012-04-13 17:28 ` redi at gcc dot gnu.org 2012-04-13 17:44 ` drinob at gmail dot com
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