}
	return copysign(g, f)
}

func complex128div(n complex128, m complex128) complex128 {
	var e, f float64 // complex(e, f) = n/m

	// Algorithm for robust complex division as described in
	// Robert L. Smith: Algorithm 116: Complex division. Commun. ACM 5(8): 435 (1962).
	if abs(real(m)) >= abs(imag(m)) {
		ratio := imag(m) / real(m)
		denom := real(m) + ratio*imag(m)
		e = (real(n) + imag(n)*ratio) / denom

      }
    }
  }
// end::task-create-rule[]
}

apply plugin: PersonRules
// end::rule-source-plugin[]
// end::managed-type-and-plugin[]

// tag::dsl[]
model {
  person {
    lastName = "Smith"
  }
}
// end::dsl[]
// end::managed-type-plugin-and-dsl[]

enum MaritalStatus {
    SINGLE,
    MARRIED

    + id
          | Type:   	java.lang.Long
          | Value:  	null
          | Creator: 	PersonRules#person(Person)
    + lastName
          | Type:   	java.lang.String
          | Value:  	Smith
          | Creator: 	PersonRules#person(Person)
    + maritalStatus
          | Type:   	MaritalStatus
          | Creator: 	PersonRules#person(Person)
    + mother
          | Type:   	Person