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* [Bug c++/110604] New: template argument deduction failed with decltype(lambda)
@ 2023-07-09 13:47 ted at lyncon dot se
2023-07-11 13:42 ` [Bug c++/110604] " ppalka at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: ted at lyncon dot se @ 2023-07-09 13:47 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110604
Bug ID: 110604
Summary: template argument deduction failed with
decltype(lambda)
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ted at lyncon dot se
Target Milestone: ---
Compiling this in C++20 mode on trunk (https://godbolt.org/z/dW5cf3WrK):
```
template<typename>
struct foo {
template<typename = decltype([]{})>
void bar() {}
};
int main() {
[[maybe_unused]] auto v = foo<void>();
v.bar<>();
v.bar();
}
```
Results in the following error:
```
<source>: In function 'int main()':
<source>:10:12: error: no matching function for call to 'foo<void>::bar<>()'
10 | v.bar<>();
| ~~~~~~~^~
<source>:4:10: note: candidate: 'template<class> void foo<
<template-parameter-1-1> >::bar() [with <template-parameter-1-1> = void]'
4 | void bar() {}
| ^~~
<source>:4:10: note: template argument deduction/substitution failed:
<source>:11:10: error: no matching function for call to 'foo<void>::bar()'
11 | v.bar();
| ~~~~~^~
<source>:4:10: note: candidate: 'template<class> void foo<
<template-parameter-1-1> >::bar() [with <template-parameter-1-1> = void]'
4 | void bar() {}
| ^~~
<source>:4:10: note: template argument deduction/substitution failed:
```
Possibly a duplicate of https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102721,
but I'm not 100% sure.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c++/110604] template argument deduction failed with decltype(lambda)
2023-07-09 13:47 [Bug c++/110604] New: template argument deduction failed with decltype(lambda) ted at lyncon dot se
@ 2023-07-11 13:42 ` ppalka at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: ppalka at gcc dot gnu.org @ 2023-07-11 13:42 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110604
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |DUPLICATE
Status|UNCONFIRMED |RESOLVED
CC| |ppalka at gcc dot gnu.org
--- Comment #1 from Patrick Palka <ppalka at gcc dot gnu.org> ---
dup of PR93595
*** This bug has been marked as a duplicate of bug 93595 ***
^ permalink raw reply [flat|nested] 2+ messages in thread
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2023-07-09 13:47 [Bug c++/110604] New: template argument deduction failed with decltype(lambda) ted at lyncon dot se
2023-07-11 13:42 ` [Bug c++/110604] " ppalka at gcc dot gnu.org
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