Add Rng trait method choose_mut
diff --git a/src/lib.rs b/src/lib.rs
index dccd715..74777b8 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -517,6 +517,18 @@
}
}
+ /// Return a mutable pointer to a random element from `values`.
+ ///
+ /// Return `None` if `values` is empty.
+ fn choose_mut<'a, T>(&mut self, values: &'a mut [T]) -> Option<&'a mut T> where Self: Sized {
+ if values.is_empty() {
+ None
+ } else {
+ let len = values.len();
+ Some(&mut values[self.gen_range(0, len)])
+ }
+ }
+
/// Shuffle a mutable slice in place.
///
/// # Example
