https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104418
Bug ID: 104418
Summary: Error inheriting base class constructors by
using-declaration
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: fchelnokov at gmail dot com
Target Milestone: ---
This code
```
struct B {
B(int) {}
B(int&&) {}
};
int i = 1;
B b(i); //ok everywhere
struct C : B {
using B::B;
};
C c(i); //ok in Clang only
```
is accepted in Clang, but GCC complains:
```
<source>:13:6: error: use of deleted function 'C::C(int) [inherited from B]'
13 | C c(i);
| ^
<source>:10:14: note: 'C::C(int) [inherited from B]' is implicitly deleted
because the default definition would be ill-formed:
10 | using B::B;
| ^
<source>:10:14: error: call of overloaded 'B(int)' is ambiguous
```
Demo: https://gcc.godbolt.org/z/79EoYM94d
Related question: https://stackoverflow.com/q/71005539/7325599
