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Re: type of arg 2 to scm_object_to_string ?

From: Marius Vollmer
Subject: Re: type of arg 2 to scm_object_to_string ?
Date: Wed, 22 Sep 2004 03:35:13 +0200
User-agent: Gnus/5.1006 (Gnus v5.10.6) Emacs/21.3 (gnu/linux)

Tano Fotang <address@hidden> writes:

> I did:
>     SCM my_result = scm_object_to_string(my_object, scm_display);
> and get the following compiler warning:
>     our_guile.c:228: warning: passing arg 2 of `scm_object_to_string'
> from incompatible pointer type

The second argument of scm_object_to_string is a SCM value, not a C
procedure.  You could do:

  display_proc = scm_variable_ref (scm_c_lookup ("display"));
  my_result = scm_object_to_string (my_object, display_proc);

Or you could use scm_simple_format:

  format_string = scm_from_locale_string ("~a");
  my_result = scm_simple_format (SCM_BOOL_F, format_string, my_object);

Both display_proc and format_string need only be computed once, of
course, but should be protected with scm_gc_protect_object when they
are stored in a global variable.

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