tests/base_gen_variance.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]
  18         var e: nullable E = null
  19 end
  20
  21 class A
  22         fun foo do 1.output
  23 end
  24 class B
  25         super A
  26         redef fun foo do 2.output
  27         fun bar do 20.output
  28 end
  29 class C
  30         super A
  31         redef fun foo do 3.output
  32         fun function_never_called do 300.output
  33 end
  34
  35 var b: B = new B
  36 var gb: G[B] = new G[B]
  37 var gbe: nullable B
  38
  39 gb.e = b
  40 gbe = gb.e
  41 gbe.foo
  42 gbe.bar
  43
  44 var a: A = b
  45
  46 #alt1#gb.e = a.as(B)
  47 #alt1#gbe = gb.e
  48 #alt1#gbe.foo
  49 #alt1#gbe.bar
  50
  51 var ga: G[A] = gb
  52
  53 ga.e = a
  54 gbe = gb.e
  55 gbe.foo
  56 gbe.bar
  57
  58 var c: A = new C
  59
  60 #alt2#gb.e = c.as(B)
  61 #alt2#gbe = gb.e
  62 #alt2#gbe.foo
  63 #alt3#gbe.bar
  64
  65 #alt3#ga.e = c
  66 #alt3#gbe = gb.e
  67 #alt3#gbe.foo
  68 #alt3#gbe.bar
  69
  70 var ggb: G[G[B]] = new G[G[B]]
  71 var ggbe: nullable G[B]
  72 var ggbee: nullable B
  73
  74 ggb.e = gb
  75 ggbe = ggb.e
  76 ggbee = ggbe.e
  77 ggbee.foo
  78 ggbee.bar
  79
  80 #alt4#ggb.e = ga.as(G[B])
  81 #alt4#ggbe = ggb.e
  82 #alt4#ggbee = ggbe.e
  83 #alt4#ggbee.foo
  84 #alt4#ggbee.bar
  85
  86 var gga: G[G[A]] = ggb
  87
  88 gga.e = ga
  89 ggbe = ggb.e
  90 ggbee = ggbe.e
  91 ggbee.foo
  92 ggbee.bar
  93
  94 var gc: G[A] = new G[C]
  95 gc.e = c
  96
  97 #alt5#ggb.e = gc.as(G[B])
  98 #alt5#ggbe = ggb.e
  99 #alt5#ggbee = ggbe.e
 100 #alt5#ggbee.foo
 101 #alt5#ggbee.bar
 102
 103 #alt6#gga.e = gc
 104 #alt6#ggbe = ggb.e
 105 #alt6#ggbee = ggbe.e
 106 #alt6#ggbee.foo
 107 #alt6#ggbee.bar
 108
 109 var ga2: G[A] = new G[A]
 110 ga2.e = b
 111
 112 #alt7#ggb.e = ga2.as(G[B])
 113 #alt7#ggbe = ggb.e
 114 #alt7#ggbee = ggbe.e
 115 #alt7#ggbee.foo
 116 #alt7#ggbee.bar
 117
 118 #alt8#gga.e = ga2
 119 #alt8#ggbe = ggb.e
 120 #alt8#ggbee = ggbe.e
 121 #alt8#ggbee.foo
 122 #alt8#ggbee.bar
 123
 124 # make the funtions live
 125 if false then (new C).function_never_called
 126 if false then (new C).foo