Filter out common object functions

[Inquie via Digitalmars-d-learn]

On Tuesday, 14 March 2017 at 19:43:59 UTC, Adam D. Ruppe wrote:
> On Tuesday, 14 March 2017 at 19:39:26 UTC, Inquie wrote:
>> __traits(allMembers, T);
>
> Try derivedMembers instead.

That doesn't work, unfortunately, probably because of the types 
I'm using(just returns object.

What I can do is this:

	enum isElementOfObject(alias T) = (staticIndexOf!(T, 
__traits(allMembers, Object)) < 0) ? true : false;
	enum isElementOfIDispatch(alias T) = (staticIndexOf!(T, 
__traits(allMembers, IDispatch)) < 0) ? true : false;	
	enum membersList = Filter!(isElementOfIDispatch, 
Filter!(isElementOfObject, __traits(derivedMembers, T)));


It would be nice if instead of having to make a large list of 
isElementOf____, I could pass the types to the predicate:


         enum isElementOf(alias S, alias T) = (staticIndexOf!(T, 
__traits(allMembers, S)) < 0) ? true : false;
	enum membersList = Filter!(isElementOf!Object, 
__traits(derivedMembers, T)));

and ultimately give a list of objects:


	enum membersList = Filter!(isElementOf!(Object, IDispatch), 
__traits(derivedMembers, T)));


Would be pretty cool if D could do that, but I doubt it can ;/ 
(not logically impossible, sort of like currying or something)