template auto instantiation when parameters empty

[Erik Smith via Digitalmars-d-learn]

I want to have a struct template auto instantiate when the 
template parameters are defaulted or missing.  Example:

struct Resource(T=int) {
     static auto create() {return Resource(null);}
     this(string s) {}
}

auto resource = Resource.create;

As a plain struct it works, but not as a template:

struct Resource {   // works
struct Resource() {  // fails
struct Resource(T=int) {  // fails

At the call site, this works, but I'm hoping for a few less 
symbols:

auto resource = Resource!().create;

Any ideas?