Re: [Caml-list] kprintf with user formatters

[henri dubois-ferriere <henridf@gmail.com>]

any idea how this would compare (performance-wise) to building a closure 
(fun () ->  printf  ...) , and then evaluating the closure only when
the debug level is ok?

henri 


On Thu, 15 Jul 2004 09:59:45 +0200, Jean-Christophe Filliatre
<jean-christophe.filliatre@lri.fr> wrote:
> 
> David MENTRE writes:
>  >
>  > > If the given log level "level" does not allow logging the message
>  > > specified by "fmt", I just want to ignore the parameters provided together
>  > > with "fmt" - but how?
>  >
>  > # let cur_level = ref 0;;
>  > val cur_level : int ref = {contents = 0}
>  > # let log level fmt =
>  >   let print_at_level str = if !cur_level >= level then print_string str in
>  >   Format.kprintf print_at_level fmt;;
>  > val log : int -> ('a, unit, string, unit) format4 -> 'a = <fun>
> 
> This solution still has the drawback of evaluating the whole message
> (which can be costly).
> 
> Damien Pous's post has the expected behavior (printf arguments are
> simply discarded without any evaluation) but requires Obj.magic...
> 
> --
> Jean-Christophe
> 
> 
> 
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