tests/base_eq_null_notnull.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2009 Jean Privat <jean@pryen.org>
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at
   8 #
   9 #     http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 import end
  18
  19 class Object
  20         fun ==(o: nullable Object): Bool do return self is o
  21         fun !=(o: nullable Object): Bool do return not (self == o)
  22         fun output is intern
  23 end
  24
  25 class Bool
  26         redef fun output is intern
  27 end
  28
  29 class A
  30 end
  31
  32 var a = new A
  33 var b: nullable A = new A
  34
  35 (a == a).output
  36 (not a == b).output
  37 (not a == null).output
  38 (not b == a).output
  39 (b == b).output
  40 (not b == null).output
  41
  42 (not a != a).output
  43 (a != b).output
  44 (a != null).output
  45 (b != a).output
  46 (not b != b).output
  47 (b != null).output