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FigureSet is the library which treats set operation. FigureSet is able to treat the set of 32bit integer.(0 .. 2 ** 32 -1)

empty_set = FigureSet.new

set = FigureSet.new([0,3,6,7])

set = FigureSet.new
set.add 10
set << 100
set.to_a #=> [10, 100]

set = FigureSet.new([1,4,5])
set.delete(4)
set.to_a #=> [1, 5]

set1 = FigureSet.new([1,2,3,5])
set2 = FigureSet.new([2,4,6])
set_and = set1 & set2
set_and.to_a #=> [2]

set1 = FigureSet.new([1,2,3,5])
set2 = FigureSet.new([2,4,6])
set_or = set1 | set2
set_or.to_a #=> [1,2,3,4,5,6]

set = FigureSet.new([1,2,3])
set.size #=> 3

set = FigureSet.new
set.empty? #=> true

set = FigureSet.new([1,2,3])
set.clear
set.to_a #=> []

sudo gem install figure_set

FigureSet is released under the MIT license.