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From: "mital at mitalashok dot co.uk" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/112590] structural constexpr class fails to instantiate
Date: Fri, 17 Nov 2023 17:46:18 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112590

Mital Ashok <mital at mitalashok dot co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mital at mitalashok dot co=
.uk

--- Comment #1 from Mital Ashok <mital at mitalashok dot co.uk> ---
See [temp.arg.nontype]p3
<https://timsong-cpp.github.io/cppwp/n4868/temp.arg.nontype#3>:

> For a non-type template-parameter of reference type, or for each non-stat=
ic
> 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.=