tests/base_isa_cast.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2008 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 kernel
  18
  19 class A
  20         init do end
  21 end
  22 class B
  23 special A
  24         fun foo do 0.output
  25         init do end
  26 end
  27 class C
  28 special B
  29         fun bar do 1.output
  30         init do end
  31 end
  32
  33
  34 #alt5# var b: A = new B
  35 var a: A = new C
  36 #alt5# a = b
  37 #alt6# a = new A
  38 if a isa B then
  39         a.foo
  40         if a isa C then
  41                 a.bar
  42         end
  43 #alt1#  a.bar
  44         a.foo
  45 else
  46 #alt2#  a.foo
  47 end
  48 #alt3#a.foo
  49
  50 if a isa B and a == a then
  51         a.foo
  52 end
  53
  54 if a isa B or a == a then
  55 #alt4#  a.foo
  56 end
  57
  58 assert a isa B
  59 a.foo