1 files changed, 25 insertions, 0 deletions
diff --git a/vendor/petgraph/src/util.rs b/vendor/petgraph/src/util.rs
new file mode 100644
index 000000000..f4d28d9d4
--- /dev/null
+++ b/vendor/petgraph/src/util.rs
@@ -0,0 +1,25 @@
+use std::iter;
+
+pub fn enumerate<I>(iterable: I) -> iter::Enumerate<I::IntoIter>
+where
+    I: IntoIterator,
+{
+    iterable.into_iter().enumerate()
+}
+
+#[cfg(feature = "serde-1")]
+pub fn rev<I>(iterable: I) -> iter::Rev<I::IntoIter>
+where
+    I: IntoIterator,
+    I::IntoIter: DoubleEndedIterator,
+{
+    iterable.into_iter().rev()
+}
+
+pub fn zip<I, J>(i: I, j: J) -> iter::Zip<I::IntoIter, J::IntoIter>
+where
+    I: IntoIterator,
+    J: IntoIterator,
+{
+    i.into_iter().zip(j)
+}