implement_set_powerset.patch - Ruby master - Ruby Issue Tracking System

Feature #10726 » implement_set_powerset.patch

     === Stdlib updates (outstanding ones only)
     * lib/set.rb
       * New methods:
         * Set#powerset returns set of all subsets of +self+.
     === Stdlib compatibility issues (excluding feature bug fixes)
     * lib/webrick/utils.rb

         end
       end
       # Returns set of all subsets of +self+.
+      #
       # e.g.:
+      #
       #   require 'set'
       #   set = Set[1, 2].powerset
       #   p set     # => #<Set: {#<Set: {}>,
       #             #            #<Set: {1}>,
       #             #            #<Set: {2}>,
       #             #            #<Set: {1, 2}>}>
       def powerset
         (0 .. 2 ** length - 1).map { |n|
           select.with_index { |_, i| (n >> i) & 1 == 1 }.to_set
         }.to_set
       end
       InspectKey = :__inspect_key__         # :nodoc:
       # Returns a string containing a human-readable representation of the

+        }
       end
       def test_powerset
         assert_equal(Set[1, 2].powerset, Set[Set[], Set[1], Set[2], Set[1, 2]])
         assert_equal(
           Set[1, 2, 3].powerset,
           Set[Set[], Set[1], Set[2], Set[3], Set[1, 2], Set[2, 3], Set[3, 1], Set[1, 2, 3]]
+        )
       end
       def test_taintness
         orig = set = Set[1,2,3]
         assert_equal false, set.tainted?
+    -

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