[Swig-dev] Limited Support for Multiple Inheritance in SWIG/Ruby

ruby-talk
1

Wait! (Replying to myself :wink:

I had temporarily forgotten that a Class is-a Module, so maybe there's no
problem after all. I just wrap all of the base classes (Base1, Base2 and
Base3) normally and then mix the "non-primary" base classes into Derived, e.g.

    class Base1; end
    class Base2; end
    class Base3; end

    class Derived < Base1
      include Base2
      include Base3
    end

That should do the trick, right? Even better!

Lyle

2

That should do the trick, right? Even better!

Just test with ruby what you have written :-))

Guy Decoux

3

ts wrote:

Just test with ruby what you have written :-))

Oh, well :wink: I hoped I had found a quick and elegant solution to the
problem, but as Guy points out:

 $ cat hopeful.rb
 class Base1; end

 class Base2; end

 class Derived < Base1
   include Base2
 end

 $ ruby hopeful.rb
 hopeful.rb:6:in `include': wrong argument type Class (expected

Module) (TypeError)
from hopeful.rb:6

I’m sure there’s a good reason, but why this restriction?