http://d.puremagic.com/issues/show_bug.cgi?id=10035
Summary: Rebindable does not work with CTFE
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P2
Component: DMD
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from Jonathan M Davis <[email protected]> 2013-05-05 16:15:27
PDT ---
This code does not yet compile:
import std.typecons;
class C {}
struct S
{
Rebindable!(immutable C) c = new immutable(C);
}
void main() {}
Rather, it gives this error:
q.d(7): Error: Unions with overlapping fields are not yet supported in CTFE
q.d(7): Error: Unions with overlapping fields are not yet supported in CTFE
Rebindable uses a union
private union
{
T original;
U stripped;
}
where U is T Except that U is fully mutable where T is const or immutable.
According to Don, supporting this in CTFE should be quite straightforward. And
now that we can create immutable classes during CTFE and then use them at
runtime, with this enhancement, I'll be able to default-initialize SysTime's
timezone field (which is a Rebindable!(immutable TimeZone)) and make
SysTime.init valid to use.
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