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| Recipe 2.4: Creating 'Class Attributes' |
Last Updated: Sep 8, 2003
Status: Draft
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Problem:
You want to create an attribute that is the same for all instances of a class: instead of each instance of a class having a separate copy of the attribute, each instance should instead refer to one, "classwide" value.
Solution:
Use my and our:
class MyClass {
my $bar = 0;
our $foo = 0;
method zap { ... }
}
Discussion:
Perl6 classes are simply special types of packages; you can use my and our as you would inside a normal package.
my declares a variable that is private to the class it is created in. our declares a variable that is publicly available.
Issue:
There's a problem with this, if we want to allow MyClass.foo to work (as opposed to $MyClass::foo): another recipe states that calling-by-classname would circumvent privacy, meaning you couldn't have private class attribs.
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