Actually, you have it a bit backwards, get can see $!z just fine, it is the constructor which is not setting $!z (because it is private).

If you really want to allow setting a private attribute at object creation time you can use a BUILD submethod:

class Dot {
    has $.x;
    has $.y;
    has $!z;

    # Fancy syntax which simply sets each private variable.
    submethod BUILD(:$!x, :$!y, :$!z) {
        say "Initializing!";
    }

    method get {
        return ($!x, $!y, $!z);
    }
};

my $a = Dot.new(x => 23, y => 42, z => 2);
say $_ for $a.get;

[download]

Notice that if you create BUILD you are responsible for handling all your attributes.

Though if $!z is private, you probably want to do some checking on it before setting (else, why is it private?). That can be done too by not using the special syntax:

    # Blindly accept x and y, but do extra checks on z:
    submethod BUILD(:$!x, :$!y, :$z) {
        say "Initializing!";
        die "z too big!" if $z > 10;
        $!z = $z;
    }

[download]

Of course, there are a million other ways to do validation of an attribute (some are better than this), just showing this way since it is relevant to your current investigations.

Update: Oh, and perl6 has a really smart say (ok, smart objects, but whatever), no need to loop anymore just for debugging statements: say $a.get works nicely (as does say $a.get.perl).

Good Day,
    Dean

In reply to Re: Private attributes in Perl 6 objects by duelafn
in thread Private attributes in Perl 6 objects by Anonymous Monk

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