Pierre Weis writes:
 > 
 > This does not solve the problem of evaluating the argument(s) of the logging
 > application. Consider the example I gave:
 > 
 > >  log 2 (fun () ->
 > >    eprintf "Argument 1 is hard to compute %d\n" (ackermann x x))
 > 
 > Your solution would lead to
 > 
 >  if_debug2 eprintf "Argument 1 is hard to compute %d\n" (ackermann x x)
 > 
 > which wastes is too much computing power when the debug turn out to be
 > off.

This is indeed  right, in the general case. However the  way I use it,
all  the computation  is  always  within a  function  being the  first
argument of a printf %a, and  thus not evaluated (as in the print_tree
example I gave).

-- 
Jean-Christophe

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