https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104418
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
Summary|Error inheriting base class |[C++14+] Error inheriting
|constructors by |base class constructors by
|using-declaration |using-declaration
Last reconfirmed| |2022-02-08
Keywords| |rejects-valid
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Fedor Chelnokov from comment #4)
> I think `using B::B;` is not the same as redefining each constructor with
> the explicit call of base class constructor `C(int a) : B{(int)a}{}`.
Sorry I meant it should be done by static_cast<int&&>(a) which is the move
syntax rather than by a copy.
There looks like there are some differences between versions of the C++
standard too.
C++11 (before defect reports) In class.inhctor/8 had:
Each expression in the expression-list is of the form static_cast<T&&>(p),
where p is the name
of the corresponding constructor parameter and T is the declared type of p.
But that was removed it looks like with
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0136r1.html
So the code is invalid C++11 but valid C++14 it seems. clang gets it wrong for
C++11 but gets it correct for C++14+.
GCC gets it wrong for C++14+.
