Add gst::Iterator example with Resync handling

examples/src/bin/iterator.rs

@@ -0,0 +1,22 @@
+extern crate gstreamer as gst;
+use gst::prelude::*;
+
+fn main() {
+    gst::init().unwrap();
+
+    let identity = gst::ElementFactory::make("identity", None).unwrap();
+    let mut iter = identity.iterate_pads().unwrap();
+    while let Some(res) = iter.next() {
+        match res {
+            Ok(pad) => println!("Pad: {}", pad.get::<gst::Pad>().unwrap().get_name()),
+            Err(gst::IteratorError::Resync) => {
+                println!("Iterator resync");
+                iter.resync();
+            }
+            Err(gst::IteratorError::Error) => {
+                println!("Error");
+                break;
+            }
+        }
+    }
+}

gstreamer/src/iterator.rs

@@ -429,6 +429,17 @@ mod tests {
         let vals: Vec<_> = it.map(|v| v.unwrap().get::<i32>().unwrap()).collect();
         assert_eq!(vals, [1, 2, 3]);
 
+        let vec = vec![1i32, 2, 3];
+        let mut it = Iterator::from_vec(vec);
+        let mut vals = Vec::new();
+        while let Some(res) = it.next() {
+            match res {
+                Ok(v) => vals.push(v.get::<i32>().unwrap()),
+                _ => unreachable!(),
+            }
+        }
+        assert_eq!(vals, [1, 2, 3]);
+
         let vec = vec![1i32, 2, 3];
         let it = Iterator::from_vec(vec);
         let mut vals = Vec::new();