Count template parameters of method

[Andrey via Digitalmars-d-learn]

Hello,

How to count a number of parameters in uninitialized template 
method?

For example:
struct Test
{
    void abc(int a, bool status, string text)() {}
{

The method "Test.abc" has three template paramenters.

I know that "TemplateArgsOf" exists but it is used only for 
INITIALIZED templates...