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* [Bug c++/106094] New: Lifetime extension of temporary do not obey some rules of [class.temporary] @ 2022-06-26 21:41 kirshamir at gmail dot com 2022-06-26 21:49 ` [Bug c++/106094] " pinskia at gcc dot gnu.org ` (6 more replies) 0 siblings, 7 replies; 8+ messages in thread From: kirshamir at gmail dot com @ 2022-06-26 21:41 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106094 Bug ID: 106094 Summary: Lifetime extension of temporary do not obey some rules of [class.temporary] Product: gcc Version: 12.1.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: kirshamir at gmail dot com Target Milestone: --- The simple cases of lifetime extension are working. But all below do not obey the rules. Lifetime should have been extended and it is not. // casting (non user-defined) + member access const auto& a1 = static_cast<const A&&>(A("a1")).ptr; // casting (non user-defined) + member access const auto& a2 = ((const A&&)A("a2")).arr; // casting (non user-defined) + member access const auto& a3 = const_cast<const A&&>(A("a3")).str; // a pointer to a member + extending lifetime access const auto& arr_member = &A::arr; const auto& a4 = (A("a4").*arr_member)[0]; const auto& str_member = &A::str; const auto& a5 = A("a5").*str_member; const auto& ptr_member = &A::ptr; const auto& a6 = A("a6").*ptr_member; Code: https://godbolt.org/z/jeeoefhPr Rules: https://timsong-cpp.github.io/cppwp/n4868/class.temporary#6 ^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/106094] Lifetime extension of temporary do not obey some rules of [class.temporary] 2022-06-26 21:41 [Bug c++/106094] New: Lifetime extension of temporary do not obey some rules of [class.temporary] kirshamir at gmail dot com @ 2022-06-26 21:49 ` pinskia at gcc dot gnu.org 2022-06-26 21:50 ` pinskia at gcc dot gnu.org ` (5 subsequent siblings) 6 siblings, 0 replies; 8+ messages in thread From: pinskia at gcc dot gnu.org @ 2022-06-26 21:49 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106094 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- See Also| |https://gcc.gnu.org/bugzill | |a/show_bug.cgi?id=101572 --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- dynamic cast is filed as PR 101572 (though I don't see a test here). ^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/106094] Lifetime extension of temporary do not obey some rules of [class.temporary] 2022-06-26 21:41 [Bug c++/106094] New: Lifetime extension of temporary do not obey some rules of [class.temporary] kirshamir at gmail dot com 2022-06-26 21:49 ` [Bug c++/106094] " pinskia at gcc dot gnu.org @ 2022-06-26 21:50 ` pinskia at gcc dot gnu.org 2022-06-26 21:50 ` pinskia at gcc dot gnu.org ` (4 subsequent siblings) 6 siblings, 0 replies; 8+ messages in thread From: pinskia at gcc dot gnu.org @ 2022-06-26 21:50 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106094 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Created attachment 53203 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53203&action=edit testcase ^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/106094] Lifetime extension of temporary do not obey some rules of [class.temporary] 2022-06-26 21:41 [Bug c++/106094] New: Lifetime extension of temporary do not obey some rules of [class.temporary] kirshamir at gmail dot com 2022-06-26 21:49 ` [Bug c++/106094] " pinskia at gcc dot gnu.org 2022-06-26 21:50 ` pinskia at gcc dot gnu.org @ 2022-06-26 21:50 ` pinskia at gcc dot gnu.org 2022-06-26 21:52 ` pinskia at gcc dot gnu.org ` (3 subsequent siblings) 6 siblings, 0 replies; 8+ messages in thread From: pinskia at gcc dot gnu.org @ 2022-06-26 21:50 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106094 --- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Also please attach the testcase next time rather than just a link to godbolt. I attached it this time. ^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/106094] Lifetime extension of temporary do not obey some rules of [class.temporary] 2022-06-26 21:41 [Bug c++/106094] New: Lifetime extension of temporary do not obey some rules of [class.temporary] kirshamir at gmail dot com ` (2 preceding siblings ...) 2022-06-26 21:50 ` pinskia at gcc dot gnu.org @ 2022-06-26 21:52 ` pinskia at gcc dot gnu.org 2023-08-11 20:36 ` jason at gcc dot gnu.org ` (2 subsequent siblings) 6 siblings, 0 replies; 8+ messages in thread From: pinskia at gcc dot gnu.org @ 2022-06-26 21:52 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106094 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Depends on| |53288 --- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> --- PR 53288 is for the pointer to a member case I think. Referenced Bugs: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53288 [Bug 53288] [C++11] Lifetime of temporary object backing pointer-to-member expression not extended ^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/106094] Lifetime extension of temporary do not obey some rules of [class.temporary] 2022-06-26 21:41 [Bug c++/106094] New: Lifetime extension of temporary do not obey some rules of [class.temporary] kirshamir at gmail dot com ` (3 preceding siblings ...) 2022-06-26 21:52 ` pinskia at gcc dot gnu.org @ 2023-08-11 20:36 ` jason at gcc dot gnu.org 2023-08-11 20:42 ` jason at gcc dot gnu.org 2023-08-12 1:19 ` de34 at live dot cn 6 siblings, 0 replies; 8+ messages in thread From: jason at gcc dot gnu.org @ 2023-08-11 20:36 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106094 Bug 106094 depends on bug 53288, which changed state. Bug 53288 Summary: [C++11] Lifetime of temporary object backing pointer-to-member expression not extended https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53288 What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED ^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/106094] Lifetime extension of temporary do not obey some rules of [class.temporary] 2022-06-26 21:41 [Bug c++/106094] New: Lifetime extension of temporary do not obey some rules of [class.temporary] kirshamir at gmail dot com ` (4 preceding siblings ...) 2023-08-11 20:36 ` jason at gcc dot gnu.org @ 2023-08-11 20:42 ` jason at gcc dot gnu.org 2023-08-12 1:19 ` de34 at live dot cn 6 siblings, 0 replies; 8+ messages in thread From: jason at gcc dot gnu.org @ 2023-08-11 20:42 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106094 Jason Merrill <jason at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |wrong-code Status|UNCONFIRMED |NEW CC| |jason at gcc dot gnu.org Last reconfirmed| |2023-08-11 Ever confirmed|0 |1 --- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> --- Confirmed. ^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/106094] Lifetime extension of temporary do not obey some rules of [class.temporary] 2022-06-26 21:41 [Bug c++/106094] New: Lifetime extension of temporary do not obey some rules of [class.temporary] kirshamir at gmail dot com ` (5 preceding siblings ...) 2023-08-11 20:42 ` jason at gcc dot gnu.org @ 2023-08-12 1:19 ` de34 at live dot cn 6 siblings, 0 replies; 8+ messages in thread From: de34 at live dot cn @ 2023-08-12 1:19 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106094 Jiang An <de34 at live dot cn> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |de34 at live dot cn --- Comment #6 from Jiang An <de34 at live dot cn> --- CWG2666 may be related. https://cplusplus.github.io/CWG/issues/2666.html ^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2023-08-12 1:19 UTC | newest] Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2022-06-26 21:41 [Bug c++/106094] New: Lifetime extension of temporary do not obey some rules of [class.temporary] kirshamir at gmail dot com 2022-06-26 21:49 ` [Bug c++/106094] " pinskia at gcc dot gnu.org 2022-06-26 21:50 ` pinskia at gcc dot gnu.org 2022-06-26 21:50 ` pinskia at gcc dot gnu.org 2022-06-26 21:52 ` pinskia at gcc dot gnu.org 2023-08-11 20:36 ` jason at gcc dot gnu.org 2023-08-11 20:42 ` jason at gcc dot gnu.org 2023-08-12 1:19 ` de34 at live dot cn
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