can I generate an enum from a typelist?

[Vlad Levenfeld]

Ok, starting to feel a bit sheepish at this point, that 
constructor was unnecessarily verbose:

this (T) (T layer)
{
	import std.string: toLower;
	mixin ("this."~toLower (T.stringof)~"= layer;");
	this.type = cast (const) typeid (T);
}

...is what I have settled on.
Sorry for all the noise! There doesn't seem to be a way to edit 
posts here...