Re: How do you pre-evaluate a function passed to a macro?

[Stefan Monnier]

> I'm calling a function, wanting to pass nil instead of the empty string
> when the string argument is zero length.  But the function is defined as
> a macro, so the argument gets passed in unevaluated, which fails.  

> How do I force evaluation of the argument before it is passed in?

> --8<---------------cut here---------------start------------->8---
> ;; myname is a string taken from user input
> (bbdb-search (bbdb-records) (if (> (length myname) 0) myname nil) nil
> nil)

(if (> (length myname) 0)
    (bbdb-search (bbdb-records) myname nil nil)
  (bbdb-search (bbdb-records) nil nil nil))


        Stefan