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(Subrs): Note that subr must not modify its rest list.

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Kevin Ryde 2005-04-22 23:16:43 +00:00
parent a285fb8653
commit 01adf598d9
1 changed files with 12 additions and 4 deletions
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16
doc/ref/data-rep.texi
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@ -52,7 +52,7 @@
@c essay @sp 10
@c essay @comment The title is printed in a large font.
@c essay @title Data Representation in Guile
@c essay @subtitle $Id: data-rep.texi,v 1.18 2004-07-07 12:17:41 mvo Exp $
@c essay @subtitle $Id: data-rep.texi,v 1.19 2005-04-22 23:16:43 kryde Exp $
@c essay @subtitle For use with Guile @value{VERSION}
@c essay @author Jim Blandy
@c essay @author Free Software Foundation
@ -977,9 +977,14 @@ arguments, or else Guile signals an error. @var{function} receives the
subr's first @var{req} arguments as its first @var{req} arguments. If
there are fewer than @var{opt} arguments remaining, then @var{function}
receives the value @code{SCM_UNDEFINED} for any missing optional
arguments. If @var{rst} is non-zero, then any arguments after the first
@code{@var{req} + @var{opt}} are packaged up as a list as passed as
@var{function}'s last argument.
arguments.
If @var{rst} is non-zero, then any arguments after the first
@code{@var{req} + @var{opt}} are packaged up as a list and passed as
@var{function}'s last argument. @var{function} must not modify that
list. (Because when subr is called through @code{apply} the list is
directly from the @code{apply} argument, which the caller will expect
to be unchanged.)
Note that subrs can actually only accept a predefined set of
combinations of required, optional, and rest arguments. For example, a
@ -1337,3 +1342,6 @@ Scheme value and thus the first cell entry must be accessed using the
@end deftypefn
@c Local Variables:
@c TeX-master: "guile.texi"
@c End: