Hi all
I have sent a little patch, defining HalfOrder, to ruby-core in order to
get
some help with a problem I have found. Maybe this was not the best
procedure.
So I’ll try here again 
basically the patch defines a module HalfOrder which defines “>”, “>=”,
“<”
and “==” depending on “<=”, well almost because a potential #== in the
Mixer
class, as in Set cannot be overwritten. I think this is a shame.
Here goes some code expressed in ruby instead of C
module HalfOrder
Mixer has to define #<=
…
def == other
in case of performance problems you might want to define ==
yourself
self <= other && other <= self
end
…
end
class Set
include HalfOrder
end
Set.new == Set.new # works while it should raise a NoMethodError for a
missing #<=
well should as in I would like.
Any ideas? ( Maybe the HalfOrder module should complain or warn when
mixed
into a Class already containing a #==; guess I do not know how to do
that in
C, yet)
Cheers
Robert
The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore all progress
depends on the unreasonable man.
- George Bernard Shaw