tests/base_attr_lazy_nullable.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 Foo
  18         var a1: nullable Object = fa1 is lazy
  19         var a2: nullable Object = fa2 is lazy
  20         fun fa1: nullable Object do
  21                 1.output
  22                 return 10
  23         end
  24         fun fa2: nullable Object do
  25                 2.output
  26                 return 20
  27         end
  28 end
  29
  30 fun o(o: nullable Object)
  31 do
  32         if o == null then
  33                 'n'.output
  34                 '\n'.output
  35         else
  36                 o.output
  37         end
  38 end
  39
  40 var f = new Foo
  41 o f.a1
  42 o f.a1
  43 o f.a2
  44 o f.a2
  45 '\n'.output
  46
  47 var g = new Foo
  48 o g.a2
  49 o g.a1
  50 o g.a2
  51 o g.a1
  52 '\n'.output
  53
  54 var h = new Foo
  55 h.a1 = 100
  56 h.a1.output
  57 h.a1.output