tests/test_ni_global_ref.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2012 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 class ToBePreserved
  18         var id : String
  19
  20         redef fun output do print id
  21 end
  22
  23 class A
  24         fun save_as_global( tbp : ToBePreserved ) is extern import ToBePreserved::output
  25         fun recover_unsafe : ToBePreserved is extern
  26         fun recover : nullable ToBePreserved is extern import ToBePreserved as nullable
  27
  28         fun launch_gc do sys.force_garbage_collection
  29 end
  30
  31 var x = new ToBePreserved( "x" )
  32 var y = new ToBePreserved( "y" )
  33 var a = new A
  34
  35 a.save_as_global( y )
  36 sys.force_garbage_collection
  37 var r = a.recover
  38 if r != null then
  39         r.output
  40 else
  41         print "null :("
  42 end
  43
  44 a.save_as_global( x )
  45 sys.force_garbage_collection
  46 a.recover_unsafe.output