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module Gecode::SetEnum
class SetEnumConstraintReceiver
# Constrains this set enum to channel +int_enum_operand+. The i:th set
# in the enumeration of set operands is constrained to includes the value
# of the j:th integer operand.
#
# Neither reification nor negation is supported.
#
# ==== Examples
#
# # +set_enum+ is constrained to channel +int_enum+.
# int_enum.must.channel set_enum
#
# # This is another way of writing the above.
# set_enum.must.channel int_enum
def channel(enum, options = {})
unless enum.respond_to? :to_int_enum
raise TypeError, "Expected integer enum, for #{enum.class}."
end
if @params[:negate]
raise Gecode::MissingConstraintError, 'A negated channel constraint ' +
'is not implemented.'
end
if options.has_key? :reify
raise ArgumentError, 'The channel constraints does not support the ' +
'reification option.'
end
@params.update(Gecode::Set::Util.decode_options(options))
@params.update(:rhs => enum)
@model.add_constraint Channel::IntEnumChannelConstraint.new(@model, @params)
end
end
# A module that gathers the classes and modules used in channel constraints.
module Channel #:nodoc:
class IntEnumChannelConstraint < Gecode::Constraint #:nodoc:
def post
lhs, rhs = @params.values_at(:lhs, :rhs)
Gecode::Raw::channel(@model.active_space, rhs.to_int_enum.bind_array,
lhs.to_set_enum.bind_array)
end
end
end
end
Version data entries
9 entries across 9 versions & 2 rubygems