Merge #404

404: Add a mutable Coordinate iterator to LineString r=frewsxcv a=urschrei



Co-authored-by: Stephan Hügel <urschrei@gmail.com>

geo-types/src/line_string.rs

@@ -190,6 +190,16 @@ impl<T: CoordinateType> IntoIterator for LineString<T> {
     }
 }
 
+/// Mutably iterate over all the [Coordinate](struct.Coordinates.html)s in this `LineString`.
+impl<'a, T: CoordinateType> IntoIterator for &'a mut LineString<T> {
+    type Item = &'a mut Coordinate<T>;
+    type IntoIter = ::std::slice::IterMut<'a, Coordinate<T>>;
+
+    fn into_iter(self) -> ::std::slice::IterMut<'a, Coordinate<T>> {
+        self.0.iter_mut()
+    }
+}
+
 impl<T: CoordinateType> Index<usize> for LineString<T> {
     type Output = Coordinate<T>;