http://d.puremagic.com/issues/show_bug.cgi?id=8012
Summary: Add .length field to enums or provide helper function
to Phobos
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Severity: trivial
Priority: P2
Component: DMD
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from Andrej Mitrovic <[email protected]> 2012-05-01
13:44:17 PDT ---
My use-case:
enum Foo
{
x,
z,
y
}
enum Bar : Foo
{
x = Foo.x,
y = Foo.y,
z = Foo.z
}
I really want to ensure that when I update Foo I will be forced to update Bar
(IOW get a compile-time error). If enums had a .length property then I could
easily add a static assert:
static assert(Foo.length == Bar.length);
As a workaround (if the proposal is rejected), we might add this template to
Phobos:
template EnumLength(E)
if (is(E == enum))
{
enum EnumLength = [__traits(allMembers, E)].length;
}
Used like so:
static assert(EnumLength!Foo == EnumLength!Bar);
I'd prefer having .length over instantiating templates, but either is fine for
me.
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