tests/test_ni_null.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2011 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 A
  18         fun is_int_null( ni : nullable Int ) : Bool is extern import Int as not nullable
  19         fun is_a_null( na : nullable A ) : Bool is extern import A as not nullable
  20
  21         fun get_nullable_string( get_nulled : Bool ) : nullable String is extern import String::from_cstring, String as nullable
  22 end
  23
  24 var a = new A
  25
  26 print "true -? {a.is_int_null( null )}"
  27 print "false -? {a.is_int_null( 0 )}"
  28 print "false -? {a.is_int_null( 1234 )}"
  29
  30 print "true -? {a.is_a_null( null )}"
  31 print "false -? {a.is_a_null( a )}"
  32
  33 var nstr = a.get_nullable_string( true )
  34 if nstr == null then print "is null, ok" else print nstr # expects "is null"
  35
  36 nstr = a.get_nullable_string( false )
  37 if nstr == null then print "is null, error" else print nstr # expects "something"