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* [Bug c++/113300] New: GCC rejects valid program involving explicit and non explicit default constructors @ 2024-01-10 2:53 jlame646 at gmail dot com 2024-01-10 2:55 ` [Bug c++/113300] " pinskia at gcc dot gnu.org ` (6 more replies) 0 siblings, 7 replies; 8+ messages in thread From: jlame646 at gmail dot com @ 2024-01-10 2:53 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113300 Bug ID: 113300 Summary: GCC rejects valid program involving explicit and non explicit default constructors Product: gcc Version: 14.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: jlame646 at gmail dot com Target Milestone: --- The following valid program is rejected by gcc and clang but accepted by msvc. https://godbolt.org/z/Y3x8nP11M ``` struct A { explicit A(int = 10); A()= default; }; A a = {}; //msvc ok but gcc and clang fails here ``` GCC says: ``` <source>:8:8: error: conversion from '<brace-enclosed initializer list>' to 'A' is ambiguous 8 | A a = {}; //msvc ok but gcc and clang fails here | ^ <source>:5:3: note: candidate: 'constexpr A::A()' 5 | A()= default; | ^ <source>:4:12: note: candidate: 'A::A(int)' 4 | explicit A(int = 10); ``` The reason why this is valid is discussed here: https://stackoverflow.com/questions/77788861/ambiguous-constructor-error-in-gcc-but-not-in-msvc ^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/113300] GCC rejects valid program involving explicit and non explicit default constructors 2024-01-10 2:53 [Bug c++/113300] New: GCC rejects valid program involving explicit and non explicit default constructors jlame646 at gmail dot com @ 2024-01-10 2:55 ` pinskia at gcc dot gnu.org 2024-01-10 2:56 ` pinskia at gcc dot gnu.org ` (5 subsequent siblings) 6 siblings, 0 replies; 8+ messages in thread From: pinskia at gcc dot gnu.org @ 2024-01-10 2:55 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113300 --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- There is a C++ defect report in this area even ... ^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/113300] GCC rejects valid program involving explicit and non explicit default constructors 2024-01-10 2:53 [Bug c++/113300] New: GCC rejects valid program involving explicit and non explicit default constructors jlame646 at gmail dot com 2024-01-10 2:55 ` [Bug c++/113300] " pinskia at gcc dot gnu.org @ 2024-01-10 2:56 ` pinskia at gcc dot gnu.org 2024-01-10 2:59 ` [Bug c++/113300] GCC rejects valid program involving copy list initialization A a = {} of a class with " jlame646 at gmail dot com ` (4 subsequent siblings) 6 siblings, 0 replies; 8+ messages in thread From: pinskia at gcc dot gnu.org @ 2024-01-10 2:56 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113300 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|GCC rejects valid program |GCC rejects valid program |involving copy list |involving explicit and non |initialization A a = {} of |explicit default |a class with explicit and |constructors |non explicit default | |constructors | See Also| |https://gcc.gnu.org/bugzill | |a/show_bug.cgi?id=84849, | |https://gcc.gnu.org/bugzill | |a/show_bug.cgi?id=60027 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- https://wg21.link/cwg1228 ^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/113300] GCC rejects valid program involving copy list initialization A a = {} of a class with explicit and non explicit default constructors 2024-01-10 2:53 [Bug c++/113300] New: GCC rejects valid program involving explicit and non explicit default constructors jlame646 at gmail dot com 2024-01-10 2:55 ` [Bug c++/113300] " pinskia at gcc dot gnu.org 2024-01-10 2:56 ` pinskia at gcc dot gnu.org @ 2024-01-10 2:59 ` jlame646 at gmail dot com 2024-01-10 3:03 ` jlame646 at gmail dot com ` (3 subsequent siblings) 6 siblings, 0 replies; 8+ messages in thread From: jlame646 at gmail dot com @ 2024-01-10 2:59 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113300 Jason Liam <jlame646 at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|GCC rejects valid program |GCC rejects valid program |involving explicit and non |involving copy list |explicit default |initialization A a = {} of |constructors |a class with explicit and | |non explicit default | |constructors --- Comment #3 from Jason Liam <jlame646 at gmail dot com> --- (In reply to Andrew Pinski from comment #1) > There is a C++ defect report in this area even ... Can you post a link to the DR that you're referencing? Or are you referring to this https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0398r0.html ^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/113300] GCC rejects valid program involving copy list initialization A a = {} of a class with explicit and non explicit default constructors 2024-01-10 2:53 [Bug c++/113300] New: GCC rejects valid program involving explicit and non explicit default constructors jlame646 at gmail dot com ` (2 preceding siblings ...) 2024-01-10 2:59 ` [Bug c++/113300] GCC rejects valid program involving copy list initialization A a = {} of a class with " jlame646 at gmail dot com @ 2024-01-10 3:03 ` jlame646 at gmail dot com 2024-01-10 18:59 ` mpolacek at gcc dot gnu.org ` (2 subsequent siblings) 6 siblings, 0 replies; 8+ messages in thread From: jlame646 at gmail dot com @ 2024-01-10 3:03 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113300 --- Comment #4 from Jason Liam <jlame646 at gmail dot com> --- (In reply to Andrew Pinski from comment #1) > There is a C++ defect report in this area even ... Looks like that gcc and clang are non-compliant here as per this discussion in CWG issue list: https://github.com/cplusplus/CWG/issues/486 Also, the cwg 1228 is categorised as NAD. https://wg21.link/cwg1228 so this(that the program should compile) looks intentional. ^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/113300] GCC rejects valid program involving copy list initialization A a = {} of a class with explicit and non explicit default constructors 2024-01-10 2:53 [Bug c++/113300] New: GCC rejects valid program involving explicit and non explicit default constructors jlame646 at gmail dot com ` (3 preceding siblings ...) 2024-01-10 3:03 ` jlame646 at gmail dot com @ 2024-01-10 18:59 ` mpolacek at gcc dot gnu.org 2024-01-30 16:15 ` mpolacek at gcc dot gnu.org 2024-04-23 22:34 ` mpolacek at gcc dot gnu.org 6 siblings, 0 replies; 8+ messages in thread From: mpolacek at gcc dot gnu.org @ 2024-01-10 18:59 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113300 Marek Polacek <mpolacek at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Last reconfirmed| |2024-01-10 CC| |mpolacek at gcc dot gnu.org Ever confirmed|0 |1 Status|UNCONFIRMED |NEW ^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/113300] GCC rejects valid program involving copy list initialization A a = {} of a class with explicit and non explicit default constructors 2024-01-10 2:53 [Bug c++/113300] New: GCC rejects valid program involving explicit and non explicit default constructors jlame646 at gmail dot com ` (4 preceding siblings ...) 2024-01-10 18:59 ` mpolacek at gcc dot gnu.org @ 2024-01-30 16:15 ` mpolacek at gcc dot gnu.org 2024-04-23 22:34 ` mpolacek at gcc dot gnu.org 6 siblings, 0 replies; 8+ messages in thread From: mpolacek at gcc dot gnu.org @ 2024-01-30 16:15 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113300 --- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> --- Not a regression so I think it has to wait until GCC 15. I'd like to take a look then. I've updated https://gcc.gnu.org/projects/cxx-dr-status.html ^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/113300] GCC rejects valid program involving copy list initialization A a = {} of a class with explicit and non explicit default constructors 2024-01-10 2:53 [Bug c++/113300] New: GCC rejects valid program involving explicit and non explicit default constructors jlame646 at gmail dot com ` (5 preceding siblings ...) 2024-01-30 16:15 ` mpolacek at gcc dot gnu.org @ 2024-04-23 22:34 ` mpolacek at gcc dot gnu.org 6 siblings, 0 replies; 8+ messages in thread From: mpolacek at gcc dot gnu.org @ 2024-04-23 22:34 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113300 Marek Polacek <mpolacek at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |ASSIGNED Assignee|unassigned at gcc dot gnu.org |mpolacek at gcc dot gnu.org --- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> --- This is CWG 2856 https://cplusplus.github.io/CWG/issues/2856.html ^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2024-04-23 22:34 UTC | newest] Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2024-01-10 2:53 [Bug c++/113300] New: GCC rejects valid program involving explicit and non explicit default constructors jlame646 at gmail dot com 2024-01-10 2:55 ` [Bug c++/113300] " pinskia at gcc dot gnu.org 2024-01-10 2:56 ` pinskia at gcc dot gnu.org 2024-01-10 2:59 ` [Bug c++/113300] GCC rejects valid program involving copy list initialization A a = {} of a class with " jlame646 at gmail dot com 2024-01-10 3:03 ` jlame646 at gmail dot com 2024-01-10 18:59 ` mpolacek at gcc dot gnu.org 2024-01-30 16:15 ` mpolacek at gcc dot gnu.org 2024-04-23 22:34 ` mpolacek at gcc dot gnu.org
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