public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
* [Bug c++/114694] New: dependent-name alias type accepted in elaborated type specifier within a template @ 2024-04-11 14:21 ing.russomauro at gmail dot com 2024-04-11 20:22 ` [Bug c++/114694] " pinskia at gcc dot gnu.org ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: ing.russomauro at gmail dot com @ 2024-04-11 14:21 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114694 Bug ID: 114694 Summary: dependent-name alias type accepted in elaborated type specifier within a template Product: gcc Version: 13.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: ing.russomauro at gmail dot com Target Milestone: --- Here below you may find an example with a class named D, defining a nested alias type which, in turn, is referred by an elaborated type specifier within a function template f() instantiated with template type parameter equal to D. The same with a class E where 'using' syntax is used. In both cases, the alias-id is accepted. The non-dependent alias-id ('Alias') is correctly refused. The standard reads "If a typedef-name is used to identify the subject of an elaborated-type-specifier ..., the program is ill-formed." I see old tickets about elaborated-type-specifiers, as 11036, and 87781, and a single open ticket 55809, but none of them seem related to the context of a dependent-name alias within a template. class C{public: void f(){};}; using Alias = C; struct D { typedef C Alias2; }; struct E { using Alias2 = C; }; template<class T> void f() { //struct Alias x; -> error, as 'Alias' is an alias type struct T::Alias2 y; // WEIRDLY, no error here, despite 'Alias2' is // an alias type when instantiated with either T=D or T=E. y.f(); // avoids warning for unused variable typename T::Alias2 z; // ok no error with typename z.f(); // avoids warning for unused variable } void foo() { //struct Alias a; -> error, as 'Alias' is an alias type //struct D::Alias2 a2; -> error, as 'D::Alias2' is an alias type f<D>(); f<E>(); } int main(){ foo(); } ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/114694] dependent-name alias type accepted in elaborated type specifier within a template 2024-04-11 14:21 [Bug c++/114694] New: dependent-name alias type accepted in elaborated type specifier within a template ing.russomauro at gmail dot com @ 2024-04-11 20:22 ` pinskia at gcc dot gnu.org 2024-04-11 20:27 ` pinskia at gcc dot gnu.org ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu.org @ 2024-04-11 20:22 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114694 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |accepts-invalid --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- There might be a dup somewhere ... ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/114694] dependent-name alias type accepted in elaborated type specifier within a template 2024-04-11 14:21 [Bug c++/114694] New: dependent-name alias type accepted in elaborated type specifier within a template ing.russomauro at gmail dot com 2024-04-11 20:22 ` [Bug c++/114694] " pinskia at gcc dot gnu.org @ 2024-04-11 20:27 ` pinskia at gcc dot gnu.org 2024-04-11 20:30 ` pinskia at gcc dot gnu.org 2024-04-11 21:11 ` pinskia at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu.org @ 2024-04-11 20:27 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114694 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Andrew Pinski from comment #1) > There might be a dup somewhere ... PR 93816 is definitely related but it is not a dup since that has no dependent types but it does have templates being involved. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/114694] dependent-name alias type accepted in elaborated type specifier within a template 2024-04-11 14:21 [Bug c++/114694] New: dependent-name alias type accepted in elaborated type specifier within a template ing.russomauro at gmail dot com 2024-04-11 20:22 ` [Bug c++/114694] " pinskia at gcc dot gnu.org 2024-04-11 20:27 ` pinskia at gcc dot gnu.org @ 2024-04-11 20:30 ` pinskia at gcc dot gnu.org 2024-04-11 21:11 ` pinskia at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu.org @ 2024-04-11 20:30 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114694 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- See Also| |https://gcc.gnu.org/bugzill | |a/show_bug.cgi?id=21498 --- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- PR 21498 is another one in this area. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/114694] dependent-name alias type accepted in elaborated type specifier within a template 2024-04-11 14:21 [Bug c++/114694] New: dependent-name alias type accepted in elaborated type specifier within a template ing.russomauro at gmail dot com ` (2 preceding siblings ...) 2024-04-11 20:30 ` pinskia at gcc dot gnu.org @ 2024-04-11 21:11 ` pinskia at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu.org @ 2024-04-11 21:11 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114694 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Last reconfirmed| |2024-04-11 Status|UNCONFIRMED |NEW Ever confirmed|0 |1 --- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Confirmed. ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2024-04-11 21:11 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2024-04-11 14:21 [Bug c++/114694] New: dependent-name alias type accepted in elaborated type specifier within a template ing.russomauro at gmail dot com 2024-04-11 20:22 ` [Bug c++/114694] " pinskia at gcc dot gnu.org 2024-04-11 20:27 ` pinskia at gcc dot gnu.org 2024-04-11 20:30 ` pinskia at gcc dot gnu.org 2024-04-11 21:11 ` pinskia at gcc dot gnu.org
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).