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From: Pierre LINDENBAUM <Pierre.Lindenbaum@univ-nantes.fr>
To: guile-user@gnu.org
Subject: function registered with scm_c_define_gsubr: how can i handle an optional parameter?
Date: Wed, 13 Dec 2017 22:50:17 +0100	[thread overview]
Message-ID: <caddca02bf50a5514afd592351d01bbe@imap.univ-nantes.prive> (raw)

Hi all,

(cross posted on SO: https://stackoverflow.com/questions/47797521 )


I've defined a guile C function:

     static SCM myfun(SCM arg1,SCM opt_arg2)
       {
       return SCM_BOOL_T;
       }

registered with

     scm_c_define_gsubr ("myfun", 1, 1, 0, myfun);

there is one optional argument. How can I detect if opt_arg2 has been 
used ?

in

     (myfun 1)

or

     (myfun 1 2)


Thanks !



             reply	other threads:[~2017-12-13 21:50 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-13 21:50 Pierre LINDENBAUM [this message]
2017-12-14 10:19 ` function registered with scm_c_define_gsubr: how can i handle an optional parameter? Alex Vong
2017-12-14 12:30   ` Mark H Weaver
2017-12-14 13:50     ` Alex Vong
2017-12-15  8:06       ` Mark H Weaver
2017-12-15 16:59         ` Alex Vong

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