how to call class' template constructor

[Cliff via Digitalmars-d-learn]

On Sunday, 12 October 2014 at 19:46:41 UTC, ketmar via 
Digitalmars-d-learn wrote:
> Hello.
>
> please, how to call template constructor of a class? it's 
> completely
> escaped my mind. i.e. i have this class:
>
>   class A {
>     this(alias ent) (string name) {
>       ...
>     }
>   }
>
> and i want to do:
>
>   void foo () { ... }
>   auto a = new A!foo("xFn");
>
> yet compiler tells me that
>
> "template instance A!foo A is not a template declaration, it is 
> a class"
>
> yes, i know that i can rewrite constructor to something like 
> this:
>
>   this(T) (string name, T fn) if (isCallable!T) {
>     ...
>   }
>
> and then use autodeduction, but i want the first form! ;-)

How about a static factory method?  Or do you know there is a 
syntax for invoking a templatized constructor and just can't 
remember it?