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* [Bug c++/56842] New: Argument deduction failure note is empty for alias template
@ 2013-04-04 14:30 redi at gcc dot gnu.org
2013-04-11 2:41 ` [Bug c++/56842] " jason at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: redi at gcc dot gnu.org @ 2013-04-04 14:30 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56842
Bug #: 56842
Summary: Argument deduction failure note is empty for alias
template
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: redi@gcc.gnu.org
For this code:
#include <type_traits>
struct Base { };
template<typename T>
struct Constraint1
: std::enable_if<std::is_base_of<Base, T>::value>
{ };
template <typename T,
typename Requires = typename Constraint1<T>::type>
void foo() { }
struct A { };
int main()
{
foo<A>();
}
GCC gives an excellent diagnostic:
b.cc: In function 'int main()':
b.cc:18:12: error: no matching function for call to 'foo()'
foo<A>();
^
b.cc:18:12: note: candidate is:
b.cc:12:6: note: template<class T, class Requires> void foo()
void foo() { }
^
b.cc:12:6: note: template argument deduction/substitution failed:
b.cc:11:10: error: no type named 'type' in 'struct Constraint1<A>'
typename Requires = typename Constraint1<T>::type>
^
However after changing it to use an alias template, which makes the declaration
of bar() much easier to read:
#include <type_traits>
struct Base { };
template<typename T>
using Constraint2
= typename std::enable_if<std::is_base_of<Base, T>::value>::type;
template <typename T,
typename Requires = Constraint2<T>>
void bar() { }
struct A { };
int main()
{
bar<A>();
}
GCC produces a useless diagnostic:
b.cc: In function 'int main()':
b.cc:16:12: error: no matching function for call to 'bar()'
bar<A>();
^
b.cc:16:12: note: candidate is:
b.cc:10:6: note: template<class T, class Requires> void bar()
void bar() { }
^
b.cc:10:6: note: template argument deduction/substitution failed:
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/56842] Argument deduction failure note is empty for alias template
2013-04-04 14:30 [Bug c++/56842] New: Argument deduction failure note is empty for alias template redi at gcc dot gnu.org
@ 2013-04-11 2:41 ` jason at gcc dot gnu.org
2020-11-10 17:48 ` redi at gcc dot gnu.org
2024-04-06 23:16 ` pinskia at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: jason at gcc dot gnu.org @ 2013-04-11 2:41 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56842
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dodji at gcc dot gnu.org,
| |jason at gcc dot gnu.org
--- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> 2013-04-11 02:41:22 UTC ---
Another alias issue.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/56842] Argument deduction failure note is empty for alias template
2013-04-04 14:30 [Bug c++/56842] New: Argument deduction failure note is empty for alias template redi at gcc dot gnu.org
2013-04-11 2:41 ` [Bug c++/56842] " jason at gcc dot gnu.org
@ 2020-11-10 17:48 ` redi at gcc dot gnu.org
2024-04-06 23:16 ` pinskia at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: redi at gcc dot gnu.org @ 2020-11-10 17:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56842
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|UNCONFIRMED |RESOLVED
Target Milestone|--- |9.0
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed by r270433 for PR c++/90047 - ICE with enable_if alias template.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/56842] Argument deduction failure note is empty for alias template
2013-04-04 14:30 [Bug c++/56842] New: Argument deduction failure note is empty for alias template redi at gcc dot gnu.org
2013-04-11 2:41 ` [Bug c++/56842] " jason at gcc dot gnu.org
2020-11-10 17:48 ` redi at gcc dot gnu.org
@ 2024-04-06 23:16 ` pinskia at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2024-04-06 23:16 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56842
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |lucdanton at free dot fr
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 66586 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2024-04-06 23:16 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2013-04-04 14:30 [Bug c++/56842] New: Argument deduction failure note is empty for alias template redi at gcc dot gnu.org
2013-04-11 2:41 ` [Bug c++/56842] " jason at gcc dot gnu.org
2020-11-10 17:48 ` redi at gcc dot gnu.org
2024-04-06 23:16 ` pinskia at gcc dot gnu.org
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