tests/base_isa_vt3.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2012 Alexandre Terrasa <alexandre@moz-code.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 base_minimal
  18
  19 class A[X]
  20         type T: X
  21         type U: nullable T
  22         type V: nullable Bool
  23
  24         fun testT(o: nullable Object): Bool do
  25                 return o isa T
  26         end
  27
  28         fun testU(o: nullable Object): Bool do
  29                 return o isa U
  30         end
  31
  32         fun testV(o: nullable Object): Bool do
  33                 return o isa V
  34         end
  35
  36 end
  37
  38 var a = new A[Object]
  39
  40 assert a.testT(true)
  41 assert a.testT(a)
  42 assert not a.testT(null)
  43
  44 assert a.testU(true)
  45 assert a.testU(a)
  46 assert a.testU(null)
  47
  48 assert a.testV(true)
  49 assert not a.testV(a)
  50 assert a.testV(null)
  51
  52 true.output