How do I declare a class attribute as a union of class names?

Question

I\'m reading a spreadsheet looking for different structures. When I tried the following using Moose it seems to do what I want. I could create different types of objects, as

Answer 1

You could use where

has $.found is rw where Sch_Symbol|Chip_Symbol|Net;

or define new type by subset

subset Stuff where Sch_Symbol|Chip_Symbol|Net;

class Cell {
    has Str   $.str_val is required;
    has Str   $.x_id    is required;
    has Str   $.color;
    has Str   $.border;
    has Stuff $.found   is rw;
}