[Issue 5123] Cannot assign null to a class with 'alias this'
d-bugmail at puremagic.com
d-bugmail at puremagic.com
Tue Oct 26 13:44:02 PDT 2010
http://d.puremagic.com/issues/show_bug.cgi?id=5123
bearophile_hugs at eml.cc changed:
What |Removed |Added
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CC| |bearophile_hugs at eml.cc
--- Comment #1 from bearophile_hugs at eml.cc 2010-10-26 13:43:16 PDT ---
Here alias this is doing its work of "let's pretend" a Bar instance is a Foo
instance. To solve this problem you may need something more refined than alias
this, something that allows a partial aliasing. I don't think it's an easy
thing to do.
A related program shows a different outcome:
struct Foo {}
class Bar {
Foo foo_;
alias foo_ this;
}
void main() {
Bar a;
//a = null;
Foo f;
a = f; // Access violation!
}
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