# This file is part of NIT ( http://www.nitlanguage.org ). # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.orglicensesLICENSE2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # This module beef up the clock module by allowing a clock to be comparable. # It show the usage of class refinement module clock_more import clock redef class Clock # Clock are now comparable super Comparable # Comparaison of a clock make only sense with an other clock redef type OTHER: Clock redef fun <(o) do # Note: < is the only abstract method of Comparable. # All other operators and methods rely on < and ==. return self.total_minutes < o.total_minutes end end var c1 = new Clock(8, 12) var c2 = new Clock(8, 13) var c3 = new Clock(9, 13) print "{c1}<{c2}? {c1<c2}" print "{c1}<={c2}? {c1<=c2}" print "{c1}>{c2}? {c1>c2}" print "{c1}>={c2}? {c1>=c2}" print "{c1}<=>{c2}? {c1<=>c2}" print "{c1},{c2}? max{c1.max(c2)} min{c1.min(c2)}" print "{c1}.is_between({c2}, {c3})? {c1.is_between(c2, c3)}" print "{c2}.is_between({c1}, {c3})? {c2.is_between(c1, c3)}" print "-" c1.minutes += 1 print "{c1}<{c2}? {c1<c2}" print "{c1}<={c2}? {c1<=c2}" print "{c1}>{c2}? {c1>c2}" print "{c1}>={c2}? {c1>=c2}" print "{c1}<=>{c2}? {c1<=>c2}" print "{c1},{c2}? max{c1.max(c2)} min{c1.min(c2)}" print "{c1}.is_between({c2}, {c3})? {c1.is_between(c2, c3)}" print "{c2}.is_between({c1}, {c3})? {c2.is_between(c1, c3)}"