Make enum auto castable

[Mike B Johnson via Digitalmars-d-learn]

On Monday, 5 June 2017 at 00:51:15 UTC, Jonathan M Davis wrote:
> On Monday, June 05, 2017 00:16:15 Mike B Johnson via 
> Digitalmars-d-learn wrote:
>> On Sunday, 4 June 2017 at 23:39:11 UTC, Jonathan M Davis wrote:
>> > On Sunday, June 04, 2017 22:52:55 Mike B Johnson via
>> >
>> > Digitalmars-d-learn wrote:
>> >> [...]
>> >
>> > Aside from whatever implicit conversions are built into the 
>> > language, the only way to define an implicit conversion in D 
>> > is via alias this on a user-defined type, which then tells 
>> > that type that it can convert to whatever type the result of 
>> > the alias this is. e.g. if you have
>> >
>> > [...]
>>
>> I might be able to change the enum, I assume you mean 
>> something like
>>
>> enum myenum : S { }
>>
>> where S is the struct that implicitly converts?
>
> Yes.
>
> However, be aware that you can currently only define one alias 
> this per type. So, the rest of the code will then need to be 
> able to deal with the fact that the enum is a struct that 
> implicitly converts to VARIANT and does not implicitly convert 
> to int. So, if you're just passing the enums around and 
> comparing them, you're fine, but if you need to treat them as 
> ints somewhere, then you'll need to provide an explicit 
> conversion (via overloading opCast or by creating a specific 
> function for it or just exposing a member with the int value or 
> whatever), and that could get annoying in the same way that 
> you're annoyed about the VARIANT issue right now.
>
> But if you don't actually need to treat the enum as an int, and 
> you can make it a struct that implicitly converts to VARIANT 
> instead, then that will fix your VARIANT conversion problem.
>
> - Jonathan M Davis

Well, I do need to to treat it as an int at times and opCast only 
works with cast. While I could set it up to do a cast(VARIANT), 
which is better than nothing, I'd get same result as to!VARIANT, 
which is shorter and effectively the same.

When will we get multiple alias this? all I need is two?

Hell, why not make alias this an "overloadable" function similar 
to opCast and such?