David J. Trombley [Wed, 19 May 2004]:
 > 
 > Suppose I have
 > 
 > type listener = string -> unit
 > 
 > which is intended to receive a string type as a value.
 > 
 > Could someone demonstrate a function that takes a listener
 > and a format as arguments, and uses sprintf to obtain a
 > string, and then calls the listener with the string
 > argument? 

That is precisely what kprintf does.

# type listener = string -> unit;;
type listener = string -> unit
# let f (l : listener) fmt = Printf.kprintf l fmt ;;
val f : listener -> ('a, unit, string, unit) format4 -> 'a = <fun>
# f print_endline "%s %d" "abc" 23 ;;
abc 23
- : unit = ()

-- 
   Olivier

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