tests/base_virtual_int2.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Licensed under the Apache License, Version 2.0 (the "License");
   4 # you may not use this file except in compliance with the License.
   5 # You may obtain a copy of the License at
   6 #
   7 #     http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14
  15 import kernel
  16
  17 interface A
  18         type V: A
  19         fun foo(v: V): V is abstract
  20 end
  21
  22 redef class Int
  23         super A
  24         redef type V: Int
  25         redef fun foo(v) do return self
  26 end
  27
  28 redef class Char
  29         super A
  30         redef type V: Char
  31         redef fun foo(v) do return self
  32 end
  33
  34 fun test(d: A)
  35 do
  36         d.foo(5).output
  37         #alt1#3.foo(d).output
  38         d.foo(d).output
  39         #alt2#d.foo('a').output
  40         #alt3#5.as(A).foo(d).output
  41 end
  42
  43 test(4)