From: cjon@... (Cullen J O'neill)
Date: 2001-03-14T03:40:01+09:00
Subject: [ruby-talk:12579] Re: class variables

Kent Dahl (kentda@stud.ntnu.no) wrote:
: As for an attempt at accomplishing what you were after, try this hack:
: <CODE>
: class A
:         @@A_VAR = {'A'=>1}
:
:         def A.getVAR     #dynamic method calling on the class object
: itself
:                 @@A_VAR
:         end
:
:         def A.new
:                  puts getVAR
:         end
:
:         def initialize
:         end
:
:  end
:  
:  class C < A
:          @@C_VAR = {'C'=>1}
:         def C.getVAR
:                 @@C_VAR
:         end
:
:  end
:  
:  class B < A
:          @@B_VAR = {'B'=>1}
:         def B.getVAR
:                 @@B_VAR
:         end
:  end
:
: b=B.new
: c=C.new
: a=A.new
: </CODE>

Why not this instead?

<CODE>
class A
        @VAR = {'A'=>1}
 
        def A.var
          @VAR
        end
 
        def initialize
          puts self.class.var
        end
end
 
class C < A
        @VAR = {'C'=>1}
end
 
class B < A
        @VAR = {'B'=>1}
end
 
b=B.new
c=C.new
a=A.new 
</CODE>

Cullen J O'Neill
--
cjon@engin.umich.edu