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* [Bug c++/104752] New: `Concept auto(x)` should not be a valid function-style cast
@ 2022-03-02 9:09 ensadc at mailnesia dot com
2022-03-02 15:52 ` [Bug c++/104752] " mpolacek at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: ensadc at mailnesia dot com @ 2022-03-02 9:09 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104752
Bug ID: 104752
Summary: `Concept auto(x)` should not be a valid function-style
cast
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Keywords: accepts-invalid
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ensadc at mailnesia dot com
CC: mpolacek at gcc dot gnu.org
Target Milestone: ---
https://godbolt.org/z/KbPMrbKsK
====
template<class T>
concept C = true;
auto x = auto(1); // valid (P0849R8)
auto y = C auto(1); // expect a error
====
The initializer of `y` should be an error, but is currently accepted by GCC.
[dcl.type.auto.deduct]:
> For an explicit type conversion ([expr.type.conv]), T is the specified type,
> which shall be auto.
Note that the specified type cannot be 'type-constraint auto'.
GCC does emit an error for `C<> auto(1)`.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/104752] `Concept auto(x)` should not be a valid function-style cast
2022-03-02 9:09 [Bug c++/104752] New: `Concept auto(x)` should not be a valid function-style cast ensadc at mailnesia dot com
@ 2022-03-02 15:52 ` mpolacek at gcc dot gnu.org
2022-03-10 16:23 ` cvs-commit at gcc dot gnu.org
2022-03-10 16:28 ` mpolacek at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2022-03-02 15:52 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104752
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2022-03-02
Assignee|unassigned at gcc dot gnu.org |mpolacek at gcc dot gnu.org
Status|UNCONFIRMED |ASSIGNED
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Mine then.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/104752] `Concept auto(x)` should not be a valid function-style cast
2022-03-02 9:09 [Bug c++/104752] New: `Concept auto(x)` should not be a valid function-style cast ensadc at mailnesia dot com
2022-03-02 15:52 ` [Bug c++/104752] " mpolacek at gcc dot gnu.org
@ 2022-03-10 16:23 ` cvs-commit at gcc dot gnu.org
2022-03-10 16:28 ` mpolacek at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2022-03-10 16:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104752
--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Marek Polacek <mpolacek@gcc.gnu.org>:
https://gcc.gnu.org/g:97f76b5fc4b637033229e53033b4f8b6dc23472c
commit r12-7600-g97f76b5fc4b637033229e53033b4f8b6dc23472c
Author: Marek Polacek <polacek@redhat.com>
Date: Wed Mar 2 12:12:33 2022 -0500
c++: Don't allow type-constraint auto(x) [PR104752]
104752 points out that
template<class T>
concept C = true;
auto y = C auto(1);
is ill-formed as per [dcl.type.auto.deduct]: "For an explicit type
conversion,
T is the specified type, which shall be auto." which doesn't allow
type-constraint auto.
PR c++/104752
gcc/cp/ChangeLog:
* semantics.cc (finish_compound_literal): Disallow auto{x} for
is_constrained_auto.
* typeck2.cc (build_functional_cast_1): Likewise.
gcc/testsuite/ChangeLog:
* g++.dg/cpp23/auto-fncast12.C: New test.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/104752] `Concept auto(x)` should not be a valid function-style cast
2022-03-02 9:09 [Bug c++/104752] New: `Concept auto(x)` should not be a valid function-style cast ensadc at mailnesia dot com
2022-03-02 15:52 ` [Bug c++/104752] " mpolacek at gcc dot gnu.org
2022-03-10 16:23 ` cvs-commit at gcc dot gnu.org
@ 2022-03-10 16:28 ` mpolacek at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2022-03-10 16:28 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104752
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|ASSIGNED |RESOLVED
--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed.
^ permalink raw reply [flat|nested] 4+ messages in thread
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2022-03-02 15:52 ` [Bug c++/104752] " mpolacek at gcc dot gnu.org
2022-03-10 16:23 ` cvs-commit at gcc dot gnu.org
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