http://d.puremagic.com/issues/show_bug.cgi?id=5256
Summary: null Rebindable testing not supported
Product: D
Version: D2
Platform: x86
OS/Version: Windows
Status: NEW
Keywords: rejects-valid
Severity: normal
Priority: P2
Component: DMD
AssignedTo: nob...@puremagic.com
ReportedBy: bearophile_h...@eml.cc
--- Comment #0 from bearophile_h...@eml.cc 2010-11-21 18:55:50 PST ---
This D2 program shows that you can't test if a class reference wrapped with
Rebindable is null:
import std.typecons;
const class Foo {}
void main() {
auto a = Rebindable!Foo(new Foo);
a = new Foo;
assert(a !is null); // err
}
DMD 2.050 generates:
test.d(6): Error: incompatible types for ((a) !is (null)):
'Rebindable!(const(Foo))' and 'void*'
Is this the currently correct way to do it? (It works):
assert(a.get() !is null); // OK
I have seen the get() method is not documented on the site, so is that a
temporary limitation caused by the unfinished "alis this" implementation?
(Issue tagged with "Component: DMD" because I think it's a limit of "alias
this").
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