tests/base_gen_variance3.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 class G[E: A]
  18         var e: nullable E = null
  19         fun foo(e: E)
  20         do
  21                 0.output
  22         end
  23 end
  24
  25 class H
  26         super G[B]
  27         redef fun foo(e)
  28         do
  29                 e.bar
  30         end
  31 end
  32
  33 class A
  34 end
  35 class B
  36         super A
  37         fun bar
  38         do
  39                 2.output
  40         end
  41 end
  42 class D
  43         super A
  44         fun not_bar
  45         do
  46                 100.output
  47         end
  48 end
  49
  50 var h: G[A] = new H
  51 var b = new B
  52 var d = new D
  53 h.foo(b)
  54 #alt1#h.foo(d)
  55 '!'.output
  56 b.bar
  57 '!'.output
  58 d.not_bar