tests/base_isa_vt_class.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
  20         type T: Object
  21
  22         fun foo(o: Object): Bool do
  23                 return o isa T
  24         end
  25 end
  26
  27 class B
  28         super A
  29         redef type T: B
  30         type U: Bool
  31
  32         fun bar(o: Object): Bool do
  33                 return o isa U
  34         end
  35 end
  36
  37 class C
  38         super B
  39         redef type T: C
  40 end
  41
  42 var a = new A
  43 assert a.foo(new A)
  44
  45 var b = new B
  46 assert not b.foo(new A)
  47 assert b.foo(new B)
  48 assert b.foo(new C)
  49 assert not b.bar(new B)
  50 assert b.bar(true)
  51
  52 var c = new C
  53 assert not c.foo(new A)
  54 assert not c.foo(new B)
  55 assert c.foo(new C)
  56 assert not c.bar(new B)
  57 assert c.bar(true)
  58
  59 true.output