[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Node to first or last element of a sequential list in module list/xl

From: Bruno Haible
Subject: Re: Node to first or last element of a sequential list in module list/xlist
Date: Sat, 03 Apr 2021 11:49:16 +0200
User-agent: KMail/5.1.3 (Linux/4.4.0-206-generic; KDE/5.18.0; x86_64; ; )

Marc Nieper-Wißkirchen wrote:
> > I don't understand. You want to use a list_node_t while adding nodes to
> > the list? This is invalid, since the comments in gl_list.h say:
> >
> >   /* Type representing the position of an element in the list, in a way
> > that
> >      is more adapted to the list implementation than a plain index.
> >      Note: It is invalidated by insertions and removals!  */
> >   typedef struct gl_list_node_impl * gl_list_node_t;
> >
> It won't work with removals but it does work with insertions because
> gl_list_add_before/gl_list_add_after/... etc. all return new, valid list
> node objects.

While this may be true for the linked-list implementation, it is not true
for the array-list and other implementation. But the point of the Gnulib
list module is to allow the developer to switch to a different implementation
without changing their algorithms. [1]


[1] https://savannah.gnu.org/forum/forum.php?forum_id=9898

reply via email to

[Prev in Thread] Current Thread [Next in Thread]