Adding instance variables using module include

ruby-talk
1

Hi there,

If I have a module and class like this:

module VisitMemory
    def mark_visited(method)
        @methods_visited << method.my_declaration_signature
    end

    def already_visited?(method)
        @methods_visited.include?(method.my_declaration_signature)
    end
end

module Guff
    module JavaSource
        class Class
            include VisitMemory
        end
    end
end

How can i ensure that all instances of Guff::JavaSource::Class is
going to have the instance variable @methods_visited ?

So that this will work:

Guff::JavaSource::Class.new.already_visited?(something)

Thanks very much,
Mike.

2

FWIW, this is the best I could do:

module VisitMemory
    def mark_visited(method)
        methods_visited << method.my_declaration_signature
    end

    def already_visited?(method)
        methods_visited.include?(method.my_declaration_signature)
    end
    def methods_visited
        @methods_visited ||= []
    end
end

module Guff
    module JavaSource
        class Class
            include VisitMemory
        end
    end
end

3

Hi there,

If I have a module and class like this:

module VisitMemory
    def mark_visited(method)
        @methods_visited << method.my_declaration_signature
    end

    def already_visited?(method)
        @methods_visited.include?(method.my_declaration_signature)
    end
end

module Guff
    module JavaSource
        class Class
            include VisitMemory
        end
    end
end

How can i ensure that all instances of Guff::JavaSource::Class is
going to have the instance variable @methods_visited ?

require 'set'

module VisitMemory
   def mark_visited(method)
       (@methods_visited ||= Set.new) << method.my_declaration_signature
   end

   def already_visited?(method)
       @methods_visited and
@methods_visited.include?(method.my_declaration_signature)
   end
end

So that this will work:

Guff::JavaSource::Class.new.already_visited?(something)

Cheers

robert

···

2008/1/28, me@mikehogan.net <me@mikehogan.net>:

--
use.inject do |as, often| as.you_can - without end