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Aggregate initialization of base class sub-object, what?
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Alf P. Steinbach
Mar 5, 2020, 8:27:54 PM3/5/20
to
Why does this compile as C++17 with MinGW g++ 9.2 and Visual C++ 2019?
#include <string>
struct Top { friend void g() {} };
struct Blah: Top
{
int a = 1;
int b = a;
};
auto main() -> int
{
Blah b{ {}, 3, 42 };
(void) b;
return b.b;
}
Result: exit code 42.
- Alf
#include <string>
struct Top { friend void g() {} };
struct Blah: Top
{
int a = 1;
int b = a;
};
auto main() -> int
{
Blah b{ {}, 3, 42 };
(void) b;
return b.b;
}
Result: exit code 42.
- Alf
Ian Collins
Mar 6, 2020, 4:40:46 PM3/6/20
to
On 06/03/2020 14:27, Alf P. Steinbach wrote:
> Why does this compile as C++17 with MinGW g++ 9.2 and Visual C++ 2019?
>
>
> #include <string>
>
> struct Top { friend void g() {} };
>
> struct Blah: Top
> {
> int a = 1;
> int b = a;
> };
>
> auto main() -> int
> {
> Blah b{ {}, 3, 42 };
> (void) b;
> return b.b;
> }
Wasn't the aggregate initialisation of base class sub-object introduced
> Why does this compile as C++17 with MinGW g++ 9.2 and Visual C++ 2019?
>
>
> #include <string>
>
> struct Top { friend void g() {} };
>
> struct Blah: Top
> {
> int a = 1;
> int b = a;
> };
>
> auto main() -> int
> {
> Blah b{ {}, 3, 42 };
> (void) b;
> return b.b;
> }
in C++17?
--
Ian.
Vir Campestris
Mar 6, 2020, 4:43:36 PM3/6/20
to
initialiser values in Blah, or the (void)b.
But I'm not sure I see the problem. Unless you're asking why it _only_
compiles with 17, and not with 11 - in which case I'm confused too.
Andy
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