Frank Benoit wrote:
Qian Xu schrieb:
----------- code 2 (current solution) --------------
public test(MyObj obj)
{
if (obj !is null &&
obj.getObj2 !is null &&
obj.getObj2.getObj3 !is null)
{
obj.getObj2.getObj3.test();
}
}
------------------------------------------------------
If you want to be able to return something like "nothing", you can use
NullObject. That is, return an object that lets you navigate the
references and lets you test for it being a "null" object.
auto o = obj.getObj2.getObj3;
if( !o.isNull() ){
o.test();
}
Hi, I have tried your code
But gdc said, "Error: no property 'isNull' for type
'NullPointerExceptionTest.MyObj'
Did I miss something?
--
Xu, Qian (stanleyxu)
http://stanleyxu2005.blogspot.com
