On Mon, 23 Feb 2009, Moritz Lenz wrote:
Timothy S. Nelson wrote:
Another question for everyone - is there some way I can extend a class
in such a way that it implements another role?
class A does B does C { ... }
where B and C are roles.
For example, say I have a
class Class::A that implements role Role::A, and I want it to also implement
Role::B (and I provide an implementation), is there any way I can make it so
that *every* instance of Class::A implements Role::B, while doing this from a
module that doesn't contain Role::B?
Well, the Role::B must be visible in your scope where you do the
composition.
Or is your question much more complicated than that, and I am simply to
dumb to grasp it?
Maybe I'm too dumb to communicate it. Let me give an example. Say I
do this:
$file = IO::File.new(...)
And I want all IO::File objects anywhere in my program (including ones
returned from other libraries) to all be able to .bark(). Can I do something
like this?
use File::Barker;
$file = IO::File.new(...)
$file.bark();
Is there something that will make that work, *without* me having to
edit IO::File?
I think this might be Subject-oriented programming, but the Wikipedia
page on that isn't very useful.
:)
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| Name: Tim Nelson | Because the Creator is, |
| E-mail: wayl...@wayland.id.au | I am |
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