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Dave Thomas wrote:
>
> Albert Wagner <alwagner / tcac.net> writes:
>
> > I see some class definitions contain "include" and "extend" statements.
> > I can find no doc refs to these. Also, "autoload". If these are in the
> > manual or user guide, please point me in the right direction. Is there
> > an english translation to ruby-1.4.4/ext/tcltklib/MANUAL.euc? Thanks
> > ahead for any help.
>
> Both include and extend take one or more modules and add their methods
> and constants in to something: include adds in to a class definition,
> which extend adds to a particular object.
>
> For example
>
> module Cheery
> def hello
> puts "Toodle-pip, old chap!"
> end
> end
>
> class Person
> include Cheery
> def other
> puts "other"
> end
> end
>
> p = Person.new
> p.hello #=> Toodle-pip, old chap!
> p.other #=> other
>
> s = "A String"
> s.extend Cheery
> s.hello #=> Toodle-pip, old chap!
>
> Every language needs Cheery strings.
>
> Dave
===========================================================
Thanks again, Dave. I understand your example, but not the following
code from ext/tk/lib/tkafter.rb:
:
require 'tk'
class TkAfter
include TkCore
extend TkCore
:
:
What does "extend TkCore" do in this class definition?
Also, in ext/tk/lib/tk.rb:
:
module Tk
include TkCore
extend Tk
:
:
What does "extend Tk" do in this module definition?
:
(Am I hopelessly ignorant?)
--
Small is Beautiful