HaloO,
Autrijus Tang wrote:
[..much better explaination of the co/contra prob then mine skipped..]
Hence, my proposal is that Perl 6's generics should infer its variancy,
based on the signature of its methods, and derive subtyping relationships
accordingly.
Yes!! That would be great. But I wou
As Perl 6's aggregate types are generics (Role that takes type
parameters), the problem of type variancy naturally arises.
The basic premise is that:
1. (Array of Item).does(Array of Int); # false
2. (Array of Int).does(Array of Item); # also false!
Intuitively, while an (Array
