Key arguments

[Jarrett Billingsley]

"baleog" <maccarka at yahoo.com> wrote in message 
news:g5er1d$1p15$1 at digitalmars.com...
> How can i implement key arguments in D? I want something like this:
> --
> void f(int x, double y = 2.0, int z = 3);
> ...
> f(1, z:10, y:5.1); // x=1, y=5.1, z=10
> f(1, z:10); // x=1, y=2.0, z=10
> --
> I tried to do this with Variant type and explicit type checking. But it 
> takes a lot of routine actions. Maybe exists a better way?
>
> Best regards

Downs will reply with a horrid hack involving overloading opAssign for some 
static instances of some structures and then getting their values in the 
function, but then you're severely limited since the "parameter" names are 
globals, and since that's so, you can't have two functions that use the same 
named parameters executing at the same time, either in a multithreaded 
fashion or with simple recursion.

There's no general purpose way to do it, no.