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* [Bug c++/101477] New: Wrong location for unexpanded parameter pack in function template
@ 2021-07-16 20:33 redi at gcc dot gnu.org
2021-07-16 20:34 ` [Bug c++/101477] " redi at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: redi at gcc dot gnu.org @ 2021-07-16 20:33 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101477
Bug ID: 101477
Summary: Wrong location for unexpanded parameter pack in
function template
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Target Milestone: ---
template<typename... Elements>
class tuple
{ };
template<typename... Elements>
tuple<Elements>
get(const tuple<Elements...>& t)
{
return t;
}
The error shows the wrong location:
t2.C:7:30: error: parameter packs not expanded with '...':
7 | get(const tuple<Elements...>&)
| ^
t2.C:7:30: note: 'Elements'
This case is especially confusing because the caret *almost* points to a
location where the pack *is* expanded, making it harder to spot the real
problem on the line above.
It should be:
t2.C:7:30: error: parameter packs not expanded with '...':
6 | tuple<Elements>
| ^~~~~~~~
t2.C:7:30: note: 'Elements'
Even better would be to give a fix-it hint suggesting to add the ... after
Element, although that might be counterproductive sometimes. For example, in
this case the compiler probably won't guess where to put the ...
template<typename... Elements>
std::conjunction<is_const<Elements>>
get(const tuple<Elements...>& t)
{
return t;
}
The user probably wants std::conjunction<is_const<Elements>...> not
std::conjunction<is_const<Elements...>>.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c++/101477] Wrong location for unexpanded parameter pack in function template
2021-07-16 20:33 [Bug c++/101477] New: Wrong location for unexpanded parameter pack in function template redi at gcc dot gnu.org
@ 2021-07-16 20:34 ` redi at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: redi at gcc dot gnu.org @ 2021-07-16 20:34 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101477
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2021-07-16
See Also| |https://bugs.llvm.org/show_
| |bug.cgi?id=51118
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
^ permalink raw reply [flat|nested] 2+ messages in thread
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2021-07-16 20:33 [Bug c++/101477] New: Wrong location for unexpanded parameter pack in function template redi at gcc dot gnu.org
2021-07-16 20:34 ` [Bug c++/101477] " redi at gcc dot gnu.org
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