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* [Bug c++/104000] New: Ordinary constructor cannot delegate to `consteval` constructor
@ 2022-01-13 6:48 fchelnokov at gmail dot com
2022-01-17 10:23 ` [Bug c++/104000] " pinskia at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: fchelnokov at gmail dot com @ 2022-01-13 6:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104000
Bug ID: 104000
Summary: Ordinary constructor cannot delegate to `consteval`
constructor
Product: gcc
Version: 12.0
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 A {
int i = 0;
consteval A() = default;
A(int) : A() {}
};
```
is accepted by Clang so I assume it is valid. But GCC complains: error: 'this'
is not a constant expression
Demo: https://gcc.godbolt.org/z/3T9Pxdoz1
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug c++/104000] Ordinary constructor cannot delegate to `consteval` constructor 2022-01-13 6:48 [Bug c++/104000] New: Ordinary constructor cannot delegate to `consteval` constructor fchelnokov at gmail dot com @ 2022-01-17 10:23 ` pinskia at gcc dot gnu.org 2022-01-21 9:33 ` pinskia at gcc dot gnu.org ` (3 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu.org @ 2022-01-17 10:23 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104000 --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- The error is: <source>: In constructor 'A::A(int)': <source>:5:16: error: 'this' is not a constant expression 5 | A(int) : A() {} | ^ ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/104000] Ordinary constructor cannot delegate to `consteval` constructor 2022-01-13 6:48 [Bug c++/104000] New: Ordinary constructor cannot delegate to `consteval` constructor fchelnokov at gmail dot com 2022-01-17 10:23 ` [Bug c++/104000] " pinskia at gcc dot gnu.org @ 2022-01-21 9:33 ` pinskia at gcc dot gnu.org 2022-01-21 9:34 ` pinskia at gcc dot gnu.org ` (2 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu.org @ 2022-01-21 9:33 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104000 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Last reconfirmed| |2022-01-21 Status|UNCONFIRMED |NEW Ever confirmed|0 |1 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Confirmed. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/104000] Ordinary constructor cannot delegate to `consteval` constructor 2022-01-13 6:48 [Bug c++/104000] New: Ordinary constructor cannot delegate to `consteval` constructor fchelnokov at gmail dot com 2022-01-17 10:23 ` [Bug c++/104000] " pinskia at gcc dot gnu.org 2022-01-21 9:33 ` pinskia at gcc dot gnu.org @ 2022-01-21 9:34 ` pinskia at gcc dot gnu.org 2022-01-21 10:09 ` fchelnokov at gmail dot com 2022-02-18 10:23 ` fchelnokov at gmail dot com 4 siblings, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu.org @ 2022-01-21 9:34 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104000 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Ever confirmed|1 |0 Status|NEW |UNCONFIRMED --- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Hmm, MSVC rejects it: <source>(5): error C7595: 'A::A': call to immediate function is not a constant expression Are you sure this is not a bug in clang? ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/104000] Ordinary constructor cannot delegate to `consteval` constructor 2022-01-13 6:48 [Bug c++/104000] New: Ordinary constructor cannot delegate to `consteval` constructor fchelnokov at gmail dot com ` (2 preceding siblings ...) 2022-01-21 9:34 ` pinskia at gcc dot gnu.org @ 2022-01-21 10:09 ` fchelnokov at gmail dot com 2022-02-18 10:23 ` fchelnokov at gmail dot com 4 siblings, 0 replies; 6+ messages in thread From: fchelnokov at gmail dot com @ 2022-01-21 10:09 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104000 --- Comment #4 from Fedor Chelnokov <fchelnokov at gmail dot com> --- If we take MSVC into consideration, then it rejects ``` struct A { consteval A() = default; A(int) : A() {} }; ``` which GCC accepts. So there is a divergence with MSVC as well.https://gcc.godbolt.org/z/o8rqP14Gc To be sure I asked the question: https://stackoverflow.com/q/70677825/7325599 Let us hope that it will be clarified. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/104000] Ordinary constructor cannot delegate to `consteval` constructor 2022-01-13 6:48 [Bug c++/104000] New: Ordinary constructor cannot delegate to `consteval` constructor fchelnokov at gmail dot com ` (3 preceding siblings ...) 2022-01-21 10:09 ` fchelnokov at gmail dot com @ 2022-02-18 10:23 ` fchelnokov at gmail dot com 4 siblings, 0 replies; 6+ messages in thread From: fchelnokov at gmail dot com @ 2022-02-18 10:23 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104000 --- Comment #5 from Fedor Chelnokov <fchelnokov at gmail dot com> --- Based on stackoverflow answer, a modified example was found with the delegation to consteval constructor: ``` struct A { int i = 0; consteval A() = default; A(const A&) = delete; A(int) : A(A()) {} }; ``` which is accepted in GCC. Demo: https://gcc.godbolt.org/z/5PjraK5ox Clang rejects it until one remove `A(const A&) = delete`, which is probably another issue. ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2022-02-18 10:23 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2022-01-13 6:48 [Bug c++/104000] New: Ordinary constructor cannot delegate to `consteval` constructor fchelnokov at gmail dot com 2022-01-17 10:23 ` [Bug c++/104000] " pinskia at gcc dot gnu.org 2022-01-21 9:33 ` pinskia at gcc dot gnu.org 2022-01-21 9:34 ` pinskia at gcc dot gnu.org 2022-01-21 10:09 ` fchelnokov at gmail dot com 2022-02-18 10:23 ` fchelnokov at gmail dot com
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