> On 30 Apr 2018, at 10:55, Theo van den Heuvel <vdheu...@heuvelhlt.nl> wrote:
>
> Hi all,
>
> trying to make sense of the following excerpt from the documentation on
> object construction:
>
> Due to the default behavior of BUILDALL and BUILD submethods, named arguments
> to the constructor new derived from Mu
> can correspond directly to public attributes of any of the classes in the
> method resolution order, or to any named
> parameter of any BUILD submethod.
>
>
> I would like to build a class A and subclasses AB and more such that AB and
> friends differ in the default attribute values. On the basis of the docs I
> expected this to work:
>
> #<code>
> class A {
> has Int $.a;
> method sayit() { say $!a }
> }
>
> class AB is A {
> submethod BUILD(:$!a = 17){}
> }
>
>
> my $ab = AB.new().sayit;
> #</code>
>
> however. I get "Attribute $!a not declared in class AB", which makes sense.
> How should I write this instead?
Perhaps a recent answer by Jonathan Worthington to a similar question on
StackOverflow can be of help here:
https://stackoverflow.com/questions/50031400/inheriting-private-attributes-in-perl-6
Liz
