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 probably want them to do a common role and specify that as the type

role Common {}
class Sch-Symbol does Common {…}
…

class Cell {
  …
  has Common $.found is rw;
}

---

Or you will have to use a where constraint

class Cell {
  …
  has $.found is rw where Sch-Symbol|Chip-Symbol|Net;
}

You could also create a subset to wrap the where constraint.

subset Common of Any where Sch-Symbol|Chip-Symbol|Net;

class Cell {
  …
  has Common $.found is rw;
}

Note that a where constraint is slower than using a common role.