Dispatching on a variant

[Justin Johansson]

Christopher Wright Wrote:

> Justin Johansson wrote:
> > I've had a good poke around the forums and couldn't find anything on this so ...
> > 
> > What's the recommended method for dispatching code off the runtime type of a variant variable
> > (Phobos D2 std.variant)?
> > 
> > Does one use a bunch of
> > 
> > if ( var.peek!(type1)) { ... }
> > else if ( var.peek!(type2)  { ... }
> > 
> > for all N possible types, or is there a better & faster way with a switch or jump table of sorts?
> 
> Variant should have an accessible typeinfo property. (When I say should, 
> I mean that it would be appropriate for it to have it. I am not saying 
> that I believe it has it.) It should be faster to compare that (or 
> switch on typeinfo.name) than to peek for each type.

Thanks, there is and I was considering that.

    TypeInfo type()
    {
        TypeInfo result;
        fptr(OpID.getTypeInfo, null, &result);
        return result;
    }

Would you need a full char-by-char string compare or could you cook it on the basis of a string memory address == comparison?
(Sorry, I'm a veteran C++'er not a fully-fledged D'er yet).