tests/base_safe.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 core::kernel
  16
  17 class A
  18         fun foo(i: Int) do
  19                 'F'.output
  20                 i.output
  21         end
  22
  23         fun bar(i: Int): A do
  24                 'B'.output
  25                 i.output
  26                 return self
  27         end
  28 end
  29
  30 fun test(a: nullable A) do
  31         'a'.output
  32         (a == null).output
  33         a?.foo(1)
  34
  35         var r = a?.bar(2)
  36         'r'.output
  37         (r == null).output
  38
  39         a?.bar(10)?.bar(11)?.foo(12)
  40         #alt2#a.bar(20).foo(21)
  41         #alt3#a?.bar(20).foo(21)
  42         #alt4#a.bar(20)?.foo(21)
  43 end
  44
  45 var a = new A
  46 test(a)
  47 '\n'.output
  48 test(null)
  49
  50 #alt1#a?.foo(10)
  51 #alt1#null?.foo(11)