It seems pure ain't so pure after all

[jerro]

> private auto _funimpl(string s) {
> /* what was previously in fun(string) */
> }
>
> template fun(string s)
> {
>    enum fun = _funimpl(s);
> }
>
> // usage:
>
> fun!("times"); // always executes _funimpl at compile time
>
> -Steve

You could even use this template:

template ct(alias f)
{
     template ct(params...)
     {
         enum ct = f(params);
     }
}

to define templates like this:

alias ct!((string s)
{
     // function body...
}) fun;


or with this syntax:

alias ct!(a => a * a) pow2;