tests/test_ffi_c_polymorphism.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2014 Alexis Laferrière <alexis.laf@xymus.net>
   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 extern class NativeA
  18         new `{ return NULL; `}
  19         fun foo do print "a"
  20 end
  21
  22 extern class NativeB
  23         super NativeA
  24         new `{ return NULL; `}
  25         redef fun foo do print "b"
  26 end
  27
  28 extern class NativeC
  29         super NativeA
  30         new `{ return NULL; `}
  31         redef fun foo do print "c"
  32 end
  33
  34 class A
  35         type NATIVE: NativeA
  36         var native: NATIVE
  37 end
  38
  39 class B
  40         super A
  41         redef type NATIVE: NativeB
  42 end
  43
  44 class C
  45         super A
  46         redef type NATIVE: NativeC
  47 end
  48
  49 for a in [new A(new NativeA), new B(new NativeB), new C(new NativeC)] do
  50         a.native.foo
  51 end
  52
  53 var a = new A(new NativeA)
  54 var b = new A(new NativeB)
  55 var c = new B(new NativeB)
  56 #alt1# var d = new B(new NativeA)
  57 a.native = new NativeB
  58 #alt2# c.native = new NativeA