[Bug 742152] New: 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) | 1.x

           Summary: iterator: Add a way to iterate pads and elements only
                    once for each
    Classification: Platform
           Product: GStreamer
           Version: 1.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: tsaunier at gnome.org
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Currently in GstAggregator we have:

gboolean gst_aggregator_iterate_sinkpads(GstAggregator*  self,
      GstAggregatorPadForeachFunc func, gpointer user_data);

which does basically that but we should offer an API in the iterator for that.

in #739010 Tim proposed:

gst_iterator_once_foreach_pad / gst_iterator_once_foreach_element

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