CS 330 Lecture 39 – Mixins and Wrap-up
May 10, 2013 by Chris Johnson. Filed under
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cs330, lectures, spring 2013.
Agenda
- what ?s
- multiple inheritance in Ruby?
- implementing Orderable
- wrap-up
Code
vec3.rb
module Comparable
def < other
(self <=> other) < 0
end
def > other
(self <=> other) > 0
end
def <= other
!(self > other)
end
def >= other
!(self < other)
end
def == other
(self <=> other) == 0
end
def != other
!(self == other)
end
def between?(lo, hi)
lo <= self && self < hi
end
end
class Vector3
include Comparable
attr_reader :xyz
def initialize(*args)
if args.length == 0
@xyz = [0, 0, 0]
else
@xyz = [args[0], args[1], args[2]]
end
end
def [] i
@xyz[i]
end
def []=(i, value)
@xyz[i] = value
end
def to_s
xyz.to_s
end
def <=> other
@xyz <=> other.xyz
end
end
a = Vector3.new
b = Vector3.new(1, 2, 3)
puts a, b
puts a <=> b
puts a < b
puts a > b
puts a == b
puts a != b
puts Vector3.new(1, 1, 1).between?(a, b)
Haiku
What’s the best language?
There’s no good answer to that
Chuck Norris’s fist