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* [Bug c++/104578] New: [12 Regression] accepts invalid partial template specialization, non-type template argument depends on a template parameter
@ 2022-02-17 4:55 pinskia at gcc dot gnu.org
2022-02-17 5:01 ` [Bug c++/104578] " pinskia at gcc dot gnu.org
2022-04-06 14:44 ` [Bug c++/104578] [12 Regression][CWG1315] " jason at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-02-17 4:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104578
Bug ID: 104578
Summary: [12 Regression] accepts invalid partial template
specialization, non-type template argument depends on
a template parameter
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Keywords: accepts-invalid
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: pinskia at gcc dot gnu.org
Target Milestone: ---
While looking into PR 104567, I just happened upon some code which is rejected
by before GCC 12, MSVC, clang and ICC. I suspect it is invalid code as all
other compilers besides the trunk reject it for a similar reasons.
Take:
template <typename _TAny, int value = _TAny::param>
struct s{};
template <typename _TAny>
struct s<_TAny, _TAny::param>
{
typedef int type;
};
struct checked_type
{
static const int param = 0;
};
s<checked_type>::type t;
int main()
{
return t;
}
----- CUT ----
clang reports:
<source>:5:17: error: type of specialized non-type template argument depends on
a template parameter of the partial specialization
struct s<_TAny, _TAny::param>
^~~~~
<source>:14:18: error: no type named 'type' in 's<checked_type, 0>'
s<checked_type>::type t;
~~~~~~~~~~~~~~~~~^
MSVC reports:
<source>(8): error C2753: 's<_TAny,_TAny::param>': partial specialization
cannot match argument list for primary template
ICC reports:
<source>(5): error: the template argument list of the partial specialization
includes a nontype argument whose type depends on a template parameter
struct s<_TAny, _TAny::param>
^
GCC 11.2.0 reports:
<source>:5:8: error: template argument '_TAny::param' involves template
parameter(s)
5 | struct s<_TAny, _TAny::param>
| ^~~~~~~~~~~~~~~~~~~~~~
GCC 12 accepts this for all levels of the C++ standard.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/104578] [12 Regression] accepts invalid partial template specialization, non-type template argument depends on a template parameter
2022-02-17 4:55 [Bug c++/104578] New: [12 Regression] accepts invalid partial template specialization, non-type template argument depends on a template parameter pinskia at gcc dot gnu.org
@ 2022-02-17 5:01 ` pinskia at gcc dot gnu.org
2022-04-06 14:44 ` [Bug c++/104578] [12 Regression][CWG1315] " jason at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-02-17 5:01 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104578
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |12.0
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/104578] [12 Regression][CWG1315] accepts invalid partial template specialization, non-type template argument depends on a template parameter
2022-02-17 4:55 [Bug c++/104578] New: [12 Regression] accepts invalid partial template specialization, non-type template argument depends on a template parameter pinskia at gcc dot gnu.org
2022-02-17 5:01 ` [Bug c++/104578] " pinskia at gcc dot gnu.org
@ 2022-04-06 14:44 ` jason at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: jason at gcc dot gnu.org @ 2022-04-06 14:44 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104578
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[12 Regression] accepts |[12 Regression][CWG1315]
|invalid partial template |accepts invalid partial
|specialization, non-type |template specialization,
|template argument depends |non-type template argument
|on a template parameter |depends on a template
| |parameter
CC| |jason at gcc dot gnu.org,
| |ppalka at gcc dot gnu.org
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> ---
This was changed by r12-1093, which implements https://wg21.link/cwg1315 .
This testcase seems like exactly the sort of thing that DR1315 intended to
allow.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2022-04-06 14:44 UTC | newest]
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2022-02-17 4:55 [Bug c++/104578] New: [12 Regression] accepts invalid partial template specialization, non-type template argument depends on a template parameter pinskia at gcc dot gnu.org
2022-02-17 5:01 ` [Bug c++/104578] " pinskia at gcc dot gnu.org
2022-04-06 14:44 ` [Bug c++/104578] [12 Regression][CWG1315] " jason at gcc dot gnu.org
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