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* [Bug c++/102156] New: `cannot call constructor` error during member access
@ 2021-09-01 7:30 fchelnokov at gmail dot com
2021-09-01 8:00 ` [Bug c++/102156] " pinskia at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: fchelnokov at gmail dot com @ 2021-09-01 7:30 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102156
Bug ID: 102156
Summary: `cannot call constructor` error during member access
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: ---
The following valid code accesses a field in a base class:
```
struct A { int v; };
template <typename T> struct B : T {};
struct C : B<A> {};
int main() { return C{}.B::B<A>::v; }
```
but GCC prints an error:
```
cannot call constructor 'B<A>::B' directly
```
https://gcc.godbolt.org/z/hchqG7Tq8
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/102156] `cannot call constructor` error during member access
2021-09-01 7:30 [Bug c++/102156] New: `cannot call constructor` error during member access fchelnokov at gmail dot com
@ 2021-09-01 8:00 ` pinskia at gcc dot gnu.org
2021-09-01 8:09 ` [Bug c++/102156] [9/10/11/12 Regression] " pinskia at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-09-01 8:00 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102156
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
There was an C++ old defect report about B::B being the name of the constructor
or the class name.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/102156] [9/10/11/12 Regression] `cannot call constructor` error during member access
2021-09-01 7:30 [Bug c++/102156] New: `cannot call constructor` error during member access fchelnokov at gmail dot com
2021-09-01 8:00 ` [Bug c++/102156] " pinskia at gcc dot gnu.org
@ 2021-09-01 8:09 ` pinskia at gcc dot gnu.org
2022-01-17 13:51 ` rguenth at gcc dot gnu.org
2022-04-15 4:36 ` jason at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-09-01 8:09 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102156
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Summary|`cannot call constructor` |[9/10/11/12 Regression]
|error during member access |`cannot call constructor`
| |error during member access
Target Milestone|--- |9.5
Known to work| |4.4.7
Last reconfirmed| |2021-09-01
Status|UNCONFIRMED |NEW
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=11764
Keywords| |rejects-valid
Known to fail| |4.5.4
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> There was an C++ old defect report about B::B being the name of the
> constructor or the class name.
But it looks like it is GCC getting confused because of that defect report
(PR11764).
And here is a testcase which makes this a regression from GCC 4.4.0 (valid
C++98)
struct C{int tt;};
template<class T >
struct B :T { int t;};
struct A :B<C>
{
};
int main()
{
A t;
return t.B<C>::B<C>::tt;
}
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/102156] [9/10/11/12 Regression] `cannot call constructor` error during member access
2021-09-01 7:30 [Bug c++/102156] New: `cannot call constructor` error during member access fchelnokov at gmail dot com
2021-09-01 8:00 ` [Bug c++/102156] " pinskia at gcc dot gnu.org
2021-09-01 8:09 ` [Bug c++/102156] [9/10/11/12 Regression] " pinskia at gcc dot gnu.org
@ 2022-01-17 13:51 ` rguenth at gcc dot gnu.org
2022-04-15 4:36 ` jason at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu.org @ 2022-01-17 13:51 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102156
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/102156] [9/10/11/12 Regression] `cannot call constructor` error during member access
2021-09-01 7:30 [Bug c++/102156] New: `cannot call constructor` error during member access fchelnokov at gmail dot com
` (2 preceding siblings ...)
2022-01-17 13:51 ` rguenth at gcc dot gnu.org
@ 2022-04-15 4:36 ` jason at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: jason at gcc dot gnu.org @ 2022-04-15 4:36 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102156
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |INVALID
CC| |jason at gcc dot gnu.org
Status|NEW |RESOLVED
--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
Why do you think that DR147 doesn't apply to this testcase? We see B::B<, look
up B in B, and DR147 says we find the constructor.
The rule mentioned in PR11764, that lookup in a nested-name-specifier only
considers types and namespaces, doesn't apply here because the name B isn't
followed directly by ::. The current draft even has an example to illustrate
this:
template<int> struct B : A {};
namespace N {
template<int> void B();
int f() {
return B<0>::n; // error: N::B<0> is not a type
}
}
EDG also rejects this testcase.
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2022-04-15 4:36 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-09-01 7:30 [Bug c++/102156] New: `cannot call constructor` error during member access fchelnokov at gmail dot com
2021-09-01 8:00 ` [Bug c++/102156] " pinskia at gcc dot gnu.org
2021-09-01 8:09 ` [Bug c++/102156] [9/10/11/12 Regression] " pinskia at gcc dot gnu.org
2022-01-17 13:51 ` rguenth at gcc dot gnu.org
2022-04-15 4:36 ` jason at gcc dot gnu.org
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