[Bug c++/112590] structural constexpr class fails to instantiate

[janezz55 at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112590

--- Comment #3 from Janez Zemva  ---
Sorry for my last comment. I have prepared a more involved example:

https://github.com/user1095108/ca/blob/master/consttests.cpp

If

test();

is commented out, everything compiles, otherwise not.

[Bug c++/112590] structural constexpr class fails to instantiate

[janezz55 at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112590

--- Comment #2 from Janez Zemva  ---
Very nice, but if I write:

int main()
{
  static constexpr S<10> s;
  return 0;
}

there will still be a compile error.

[Bug c++/112590] structural constexpr class fails to instantiate

[mital at mitalashok dot co.uk via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112590

Mital Ashok  changed:

   What|Removed |Added

 CC||mital at mitalashok dot co.uk

--- Comment #1 from Mital Ashok  ---
See [temp.arg.nontype]p3
:

> For a non-type template-parameter of reference type, or for each non-static
> data member of reference or pointer type in a non-type template-parameter
> of class type or subobject thereof, the reference or pointer value shall
> not refer to or be the address of (respectively):
>  - A temporary object,
>  - [...]
>  - a subject of one of the above.

And "f_{a_}" is initializing the pointer as a subobject of a temporary
object, so this is invalid. Though the error given might be wrong or
misleading.