From: ts <decoux@...>
Date: 2002-12-15T00:38:12+09:00
Subject: Re: Inheritance Question

>>>>> "J" == Jim Freeze <jim@freeze.org> writes:

J> v1 = Vector[1]
J> v2 = Vector[2]
J> p ((v1+v2).class)

 class A < Array; end

 Array + Array ===> Array
 Array + A     ===> Array

 class V < Vector; end
 Vector + Vector ===> Vector
 Vector + V      ===> Vector

 Vector work like Array


J> Here, Vector extends array and returns a Vector and NOT Array when

 Vector don't extend Array, it implement a specialized Array

pigeon% ruby -rmatrix -e 'p Vector.ancestors'
[Vector, ExceptionForMatrix, Object, Kernel]
pigeon% 


Guy Decoux