[Bug 742152] iterator: Add a way to iterate pads and elements only once for each

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=742152
  GStreamer | gstreamer (core) | git

Tim-Philipp Müller <t.i.m> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
                 CC|                            |t.i.m at zen.co.uk
            Version|1.x                         |git
     Ever Confirmed|0                           |1
           Severity|normal                      |enhancement

--- Comment #1 from Tim-Philipp Müller <t.i.m at zen.co.uk> 2014-12-31 14:24:49 UTC ---
Maybe my suggestion is not ideal, since you would still have to do:

  iterator = gst_element_iterate_sink_pads()
  gst_iterator_once_foreach_pad (iterator, callback_func, data);
  gst_iterator_free (iterator);

It's kind of a middle way. The alternative is to add callback-based variants of
all the various _iterate*() functions.

OR, and at least from a C language point of view this might be a bit
nicer/tighter (since we have no lambda funcs there):

  iterator = gst_element_iterate_sink_pads()
  while ((pad = gst_iterator_iterate_once_get_next_pad (iterator))) {
    do_xyz...
  }
  gst_iterator_free (iterator);

as it seems to me that almost all callback functions are basically 1-3 lines of
code anyway.

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