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require 'set'
class ComparableSet < Set
def add new
# smileys only
return super new unless new.respond_to? :>
objs = find_all { |o| o.class == new.class }
objs.each do |o|
return self if o > new
delete o
end
super new
end
alias_method :<<, :add
# Set#merge bypasses enumerating the set's contents,
# so the subclassed #add would never be called
def merge enum
enum.is_a?(Enumerable) or raise ArgumentError, "value must be enumerable"
enum.each { |o| add(o) }
self
end
end
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