if there truly is no way of doing it with attributes, it makes me a bit sad

My comment had nothing to do with whether or not anything is possible in Perl 6.

it makes using perl6 public attributes "dangerous"

Duh. Yeah, public attributes are a bad idea.

Even if you manage to make $i.lb = 6; fatal when 4 == $i.ub, then users of your object are likely to do: 

$i.lb = 6;
$i.ub = 7;

[download]

and have it die half-way through.

OO in the style of "a bag of attributes with wrappers around setters (types, 'before's, etc.)" is just a terrible (anti-modular) approach to OO (despite it being extremely common).

- tye        

In reply to Re^3: [perl6] Complex Attribute Validation and/or Triggers (anti-modular) by tye
in thread [perl6] Complex Attribute Validation and/or Triggers by duelafn

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