Hello,

I'm testing Perl6 on OS X with Rakudo Star 2011-04, Parrot v3.3.0

#!/usr/bin/perl6
use v6;

class User is rw {
  has Int $.id;
  has Str $.username;
}

my $Paul = User.new;
$Paul.id = "sa";
$Paul.username = 12;

say $Paul.id;
say $Paul.username;

[download]
The id is Int and I put a Str => no error! Same for the username. How to have strong typing?

Also I know for public access attributes, perl6 automatically generate setters and getters. When I try to create a method called username, I have the error : "A method named 'username' already exists in class 'User'. It may have been supplied by a role."

I would like to create my own setter for username so that I can forbid usernames such as 'admin' or 'root'. Or I could put a 'when' on the attribute (like parameters on functions). That would do something like this (doesn't work) :

class User is rw {
  has Int $.id;
  has Str $.username when not /admin|root/;
}

[download]

In reply to Perl6: Class attribute strict static type by dièze

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