class Gecode::SelectedSet::SelectedSetOperand

A SelectedSetOperand is an uncommon operand that results from calling SetEnumOperand#[] with a SetOperand. It facilitates placing the constraints defined in SelectedSetConstraintReceiver

Examples ¶ ↑

Producing a SelectedSetOperand from set_enum and set_operand:

set_enum[set_operand]

Public Instance Methods

intersection(options = {}) click to toggle source

Produces a SetOperand representing the selected sets’ intersection. The option :with can be used to enumerate the elements in the universe.

Examples ¶ ↑

# The intersection of all sets selected by +set_enum[set]+.
set_enum[set].intersection

# The same intersection as above, but with [3,5,7] as universe.
set_enum[set].intersection(:with => [3,5,7])

# File lib/gecoder/interface/constraints/selected_set/select.rb, line 24
def intersection(options = {})
  universe = nil
  unless options.empty? 
    unless options.size == 1 and options.has_key?(:with)
      raise ArgumentError, "Expected option key :with, got #{options.keys}."
    else
      universe = options[:with]
      unless universe.kind_of?(Enumerable) and 
          universe.all?{ |element| element.kind_of? Fixnum }
        raise TypeError, "Expected the universe to be specified as " + 
          "an enumeration of fixnum, got #{universe.class}."
      end
    end
  end
  
  Element::SelectedSetIntersectionOperand.new(model, self, universe)
end

union() click to toggle source

Produces a SetOperand representing the selected sets’ union.

Examples ¶ ↑

# The union of all sets selected by +set_enum[set]+.
set_enum[set].union

# File lib/gecoder/interface/constraints/selected_set/select.rb, line 9
def union
  Element::SelectedSetUnionOperand.new(model, self)
end