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