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* [Bug c++/115471] New: Fail to capture (with initializer) constant bit-fields by reference in lambda expression
@ 2024-06-13 7:46 fchelnokov at gmail dot com
2024-06-13 7:55 ` [Bug c++/115471] " pinskia at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: fchelnokov at gmail dot com @ 2024-06-13 7:46 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115471
Bug ID: 115471
Summary: Fail to capture (with initializer) constant bit-fields
by reference in lambda expression
Product: gcc
Version: 14.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: fchelnokov at gmail dot com
Target Milestone: ---
This program
```
struct U {
int i : 4;
};
using CU = const U;
auto lm = [&y = CU{5}.i]() { return y; };
```
is accepted by Clang and MSVC, and it shall be because when initializing a
const reference from a bit-field, a temporary is created (its type is the type
of the bit-field), copy initialized with the value of the bit-field, and the
reference is bound to that temporary.
But GCC fails here with the
error: cannot capture 'CU{5}.U::i' by reference
Online demo: https://gcc.godbolt.org/z/qnToW4qfY
Related discussion: https://stackoverflow.com/q/78611419/7325599
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c++/115471] Fail to capture (with initializer) constant bit-fields by reference in lambda expression
2024-06-13 7:46 [Bug c++/115471] New: Fail to capture (with initializer) constant bit-fields by reference in lambda expression fchelnokov at gmail dot com
@ 2024-06-13 7:55 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2024-06-13 7:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115471
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=90789,
| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=87638
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note I don't think this has anything to do with bitfields, GCC fails even
without bitfields. See PR 90789, PR 87638 and others .
^ permalink raw reply [flat|nested] 2+ messages in thread
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2024-06-13 7:46 [Bug c++/115471] New: Fail to capture (with initializer) constant bit-fields by reference in lambda expression fchelnokov at gmail dot com
2024-06-13 7:55 ` [Bug c++/115471] " pinskia at gcc dot gnu.org
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