| Issue |
134287
|
| Summary |
Clang accepts ambiguous inherited constructor
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
plopresti
|
See https://stackoverflow.com/q/79553477/ and https://stackoverflow.com/a/71197138/
```
class Option;
class Base
{
public:
explicit Base(Option opt);
};
class Derived : public Base
{
public:
using Base::Base;
explicit Derived(const Option &opt);
};
Derived
doit(const Option &opt)
{
return Derived(opt);
}
```
[Live example on Godbolt](https://godbolt.org/z/ddPr6WYKc)
GCC and ICC reject the call to Derived(opt) as ambiguous. Clang allows it.
According to https://stackoverflow.com/a/71197138/:
> GCC is correct here: there is a tiebreaker that prefers direct over inherited constructors ([over.match.best.general]/2.7), but it applies only if they have the same parameter types (ignoring those whose default arguments are being used).
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