tests/base_virtual_type2.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         type E: T
  21
  22         readable writable var _e: nullable E = null
  23 end
  24
  25 class B
  26 special A
  27         init do end
  28 end
  29
  30 class T
  31         fun foo do 0.output
  32         init do end
  33 end
  34
  35 class U
  36 special T
  37         redef fun foo do 1.output
  38         init do end
  39 end
  40
  41 var b = new B
  42 var t: nullable T
  43 var u: nullable U = new U
  44
  45 b.e = u
  46 #alt1#u = b.e
  47 t = b.e
  48 b.e.foo