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* [Bug libstdc++/110366] New: [C++26] P2641R4 Checking if a union alternative is active
@ 2023-06-22 17:05 redi at gcc dot gnu.org
2023-06-22 17:15 ` [Bug libstdc++/110366] " mpolacek at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: redi at gcc dot gnu.org @ 2023-06-22 17:05 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110366
Bug ID: 110366
Summary: [C++26] P2641R4 Checking if a union alternative is
active
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Blocks: 110339
Target Milestone: ---
https://wg21.link/p2641r4
This needs a new built-in. We can't use __builtin_constant_p(&x) because the
address of a union member is a constant even if that isn't the active member.
We can't use __builtin_constant_p(x) because not all types usable in constexpr
contexts are boolean testable.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110339
[Bug 110339] Implement C++26 library features
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug libstdc++/110366] [C++26] P2641R4 Checking if a union alternative is active
2023-06-22 17:05 [Bug libstdc++/110366] New: [C++26] P2641R4 Checking if a union alternative is active redi at gcc dot gnu.org
@ 2023-06-22 17:15 ` mpolacek at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2023-06-22 17:15 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110366
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2023-06-22
Ever confirmed|0 |1
CC| |mpolacek at gcc dot gnu.org
Status|UNCONFIRMED |NEW
^ permalink raw reply [flat|nested] 2+ messages in thread
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2023-06-22 17:05 [Bug libstdc++/110366] New: [C++26] P2641R4 Checking if a union alternative is active redi at gcc dot gnu.org
2023-06-22 17:15 ` [Bug libstdc++/110366] " mpolacek at gcc dot gnu.org
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