[Bug c++/69436] Method returning "auto&" fails to resolve "*this" (-std=c++17)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69436
--- Comment #6 from vmorgulys at gmail dot com ---
Hello Jonathan,
I have another similar issue with auto and deleted contructrors
("=delete"). They are not detected at compile time.
Do you think it is related to what you mention in your comment (Concept TS)?
If I understand correctly, I need to build gcc with the trunk version to be
sure. Is it correct?
Thank you a lot for your work on gcc.
Cheers,
Marc
2016-01-22 22:03 GMT+01:00 redi at gcc dot gnu.org :
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69436
>
> --- Comment #2 from Jonathan Wakely ---
> (In reply to vmorgulys from comment #0)
> > auto& f2(auto v)
>
> This is not standard C++, it's part of the Concepts TS, and so doesn't work
> properly until GCC 6.
>
> --
> You are receiving this mail because:
> You reported the bug.
>
[Bug c++/69436] Method returning "auto&" fails to resolve "*this" (-std=c++17)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69436 Jonathan Wakely changed: What|Removed |Added Status|UNCONFIRMED |RESOLVED Resolution|--- |DUPLICATE --- Comment #5 from Jonathan Wakely --- Yes, this is another dup. Please report a new bug for outstanding bugs on trunk. *** This bug has been marked as a duplicate of bug 64969 ***
[Bug c++/69436] Method returning "auto&" fails to resolve "*this" (-std=c++17)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69436 --- Comment #2 from Jonathan Wakely --- (In reply to vmorgulys from comment #0) > auto& f2(auto v) This is not standard C++, it's part of the Concepts TS, and so doesn't work properly until GCC 6.
[Bug c++/69436] Method returning "auto&" fails to resolve "*this" (-std=c++17)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69436 --- Comment #1 from Andrew Pinski --- I think the problem is the two auto are considered the same. I don't know the C++ standard in these places to say if GCC should reject or accept it so I cannot comment on that.
[Bug c++/69436] Method returning "auto&" fails to resolve "*this" (-std=c++17)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69436
--- Comment #4 from TC ---
Although this still breaks on trunk GCC on Wandbox:
long x;
auto& f(auto) { return x; }
auto* g(auto) { return }
auto r = f(1);
auto p = g(1);
prog.cc: In instantiation of 'auto& f(auto:1) [with auto:1 = int]':
prog.cc:4:13: required from here
prog.cc:2:24: error: invalid initialization of non-const reference of type
'int&' from an rvalue of type 'int'
auto& f(auto) { return x; }
^
prog.cc: In instantiation of 'auto* g(auto:2) [with auto:2 = int]':
prog.cc:5:13: required from here
prog.cc:3:25: error: cannot convert 'long int*' to 'int*' in return
auto* g(auto) { return }
^
I guess PR64969's fix only handled functions returning 'auto', and not
something more complicated.
[Bug c++/69436] Method returning "auto&" fails to resolve "*this" (-std=c++17)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69436 TC changed: What|Removed |Added CC||rs2740 at gmail dot com --- Comment #3 from TC --- Another manifestation of PR64969 and friends?
