On 11/12/2018 11:10 PM, Jamie wrote:
> I would like my class to inherit from one of two classes based on a
> boolean value known at compile time. Something like this:
>
> void main()
> {
> Top!(OPTION.FALSE) top = new Top!(OPTION.FALSE);
> }
>
> enum OPTION
> {
> FALSE = 0.,
> TRUE = 1.
> }
>
> class One
> {}
>
> class Two
> {}
>
> class Top(OPTION option) : option ? One : Two
> {}
>
> Is this possible? I can't get it to work in the way I'm showing above.
> Cheers
I got it working inside an eponymous template. D is pretty cool actually. :)
enum OPTION
{
FALSE = 0.,
TRUE = 1.
}
class One
{}
class Two
{}
template Top(OPTION option) {
static if (option == OPTION.TRUE) {
alias Base = One;
} else {
alias Base = Two;
}
class Top : Base
{}
}
void main() {
auto a = new Top!(OPTION.FALSE);
auto b = new Top!(OPTION.TRUE);
}
Ali
