class Gecode::Set::Connection::SetSumOperand

# File doc/tmp/rdoc_dev/gecoder/interface/constraints/set/connection.rb, line 112
def constrain_equal(int_operand, constrain, propagation_options)
  set = @set.to_set_var
  lub = set.upper_bound.to_a
  lub.delete_if{ |e| @subs[e].nil? }
  substituted_lub = lub.map{ |e| @subs[e] }
  if constrain
    # Compute the theoretical bounds of the weighted sum. This is slightly
    # sloppy since we could also use the contents of the greatest lower 
    # bound.
    min = substituted_lub.find_all{ |e| e < 0}.inject(0){ |x, y| x + y }
    max = substituted_lub.find_all{ |e| e > 0}.inject(0){ |x, y| x + y }
    int_operand.must_be.in min..max
  end

  Gecode::Raw::weights(@model.active_space, lub, substituted_lub, 
    set.bind, int_operand.to_int_var.bind)
end

# File doc/tmp/rdoc_dev/gecoder/interface/constraints/set/connection.rb, line 106
def initialize(model, set_op, subs)
  super model
  @set = set_op
  @subs = subs
end