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* [Bug c++/96500] New: enum of underlying type bool do not @ 2020-08-06 14:00 fw at gcc dot gnu.org 2020-08-06 14:53 ` [Bug c++/96500] " mpolacek at gcc dot gnu.org 2020-08-06 15:33 ` [Bug c++/96500] enum of underlying type bool does not accept enumerators with integer constant values other than 0 and 1 fw at gcc dot gnu.org 0 siblings, 2 replies; 3+ messages in thread From: fw at gcc dot gnu.org @ 2020-08-06 14:00 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96500 Bug ID: 96500 Summary: enum of underlying type bool do not Product: gcc Version: 11.0 Status: UNCONFIRMED Keywords: rejects-valid Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: fw at gcc dot gnu.org Target Milestone: --- I believe this needs to be accepted: enum E : bool { One, Two, Three }; See <http://eel.is/c++draft/dcl.enum#5>, “If the underlying type is fixed, the type of each enumerator prior to the closing brace is the underlying type and the constant-expression in the enumerator-definition shall be a converted constant expression of the underlying type.”. Converted constant expressions include integral conversions. Conversion from int to bool is not a narrowing conversion. So Three should have the value true, just like Two. ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/96500] enum of underlying type bool do not 2020-08-06 14:00 [Bug c++/96500] New: enum of underlying type bool do not fw at gcc dot gnu.org @ 2020-08-06 14:53 ` mpolacek at gcc dot gnu.org 2020-08-06 15:33 ` [Bug c++/96500] enum of underlying type bool does not accept enumerators with integer constant values other than 0 and 1 fw at gcc dot gnu.org 1 sibling, 0 replies; 3+ messages in thread From: mpolacek at gcc dot gnu.org @ 2020-08-06 14:53 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96500 Marek Polacek <mpolacek at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |mpolacek at gcc dot gnu.org --- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> --- Note that here we don't have an enumerator-definition with " = constant-expression" and that converted constant expressions don't allow narrowing. I'd much prefer if this was ill-formed, but probably at the moment it isn't. ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/96500] enum of underlying type bool does not accept enumerators with integer constant values other than 0 and 1 2020-08-06 14:00 [Bug c++/96500] New: enum of underlying type bool do not fw at gcc dot gnu.org 2020-08-06 14:53 ` [Bug c++/96500] " mpolacek at gcc dot gnu.org @ 2020-08-06 15:33 ` fw at gcc dot gnu.org 1 sibling, 0 replies; 3+ messages in thread From: fw at gcc dot gnu.org @ 2020-08-06 15:33 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96500 Florian Weimer <fw at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID --- Comment #2 from Florian Weimer <fw at gcc dot gnu.org> --- I was wrong, conversions from int to bool are supposed to be narrowing, and Two + 1 has type int, and getting from there to bool is not permitted in a converted constant expression. I still have some concerns about narrowing conversions to bool, but those are independent of the enum issue. ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2020-08-06 15:33 UTC | newest] Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2020-08-06 14:00 [Bug c++/96500] New: enum of underlying type bool do not fw at gcc dot gnu.org 2020-08-06 14:53 ` [Bug c++/96500] " mpolacek at gcc dot gnu.org 2020-08-06 15:33 ` [Bug c++/96500] enum of underlying type bool does not accept enumerators with integer constant values other than 0 and 1 fw at gcc dot gnu.org
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