Re: [Caml-list] filename and line number.

[Gabriel Scherer <gabriel.scherer@gmail.com>]

Both pa_macros and cppo have a file-inclusion directive, so you could
define your preferred location-reporting macro in a header file.
That said, I would personally use the __LOCATION__ macro directly: the
less preprocessing stuff the better, and if it "clutters your code"
you could restrict your reporting a bit, which may not be a bad thing:
having a log full of useless stuff is only a bit better than having no
log.

You may also be interested in the existing logging frameworks for
OCaml, such as Bolt:
  http://bolt.x9c.fr/

On Wed, Aug 3, 2011 at 8:04 AM, Anders Fugmann <anders@fugmann.net> wrote:
> Thanks for the replies,
>
> Using cppo, would I need to define 'loc' in each file using log, or can it
> be defined in another module?
>
> If not, I guess the alternative is to create a syntax extenstion that will
> include Loc.t structure as a parameter to some print function - or add it
> manually, but I would like to avoid cluttering the code with __LOCATION__
> everywhere.
>
> Regards
> Anders Fugmann
>
>
>
> On 08/02/2011 11:21 PM, Martin Jambon wrote:
>>
>> On 08/02/11 05:45, Gabriel Scherer wrote:
>>>
>>> Finally, Martin Jambon also has its own "cppo" tools mimicking cpp,
>>> which I suppose doesn't rely on camlp4, and has __FILE__ and __LINE__
>>> macros which may be in a more directly exploitable format. I have
>>> never tried it though. See:
>>>   http://martin.jambon.free.fr/cppo.html
>>
>> That's correct. Thanks for the plug.
>>
>> Here is an example:
>>
>> $ cat loc.ml
>> #define loc (Printf.sprintf "File %S, line %i" __FILE__ __LINE__)
>>
>> print_endline loc;;
>> print_endline loc;;
>>
>> $ ocamlopt -o loc -pp cppo loc.ml; ./loc
>> File "loc.ml", line 3
>> File "loc.ml", line 4
>>
>>
>>
>> Martin
>>
>
>
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