Yeah... but what does adaptTo|duck|as do?

[Tomek Sowiński]

lurker napisał:

>> class C
>> {
>>int draw(){ return 10; }
>> }
>> interface Drawable
>> {
>>long draw();
>> }
>> ...
>> auto c = new C;
>> auto d = duck!Drawable(c);
> 
> Object c = new C;
> auto d = duck!Drawable(c); // awes
> 
> does this work? After all, c is a C:

I'd say no. c is an Object, you don't know it can draw().

> Object c = new C;
> auto d = duck!Drawable(cast(C)c);

Yeah, that's what you have to do.

> One fears this feature has little real world use. But it's a great way to
> add additional bloat to the puny little Phobos...
> 
> It's amusing as always that the syntax is being discussed before we even
> know how this works. How does the int -> long coercion work there? Any
> possibility to get a written spec for this?

I got a similar feeling after seeing there's 70+ posts in this thread. There's 
not even a link to the source to know what one is naming.

For one thing, I'd like to know whether (Duck|As|AdaptTo)!I is a class 
implementing I or a struct mimicking I's API.

Or if in duck!I(a) a already implements I, does Duck alias itself away?

Or if in duck!I(a) a is a struct exposing I's methods (walks and quacks like 
I), does Duck alias itself away?

What if I has an alias this to one of its properties?

What if I has static methods?

-- 
Tomek