From d1bce6070def3b4d5045c3fc4bb66904d50d0a40 Mon Sep 17 00:00:00 2001
From: Jonas Schievink <jonasschievink@gmail.com>
Date: Sat, 3 Apr 2021 23:45:27 +0200
Subject: Use shrink_to_fit to reduce DefMap sizes

---
 lib/arena/src/lib.rs | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'lib/arena')

diff --git a/lib/arena/src/lib.rs b/lib/arena/src/lib.rs
index 230a50291..bce15c867 100644
--- a/lib/arena/src/lib.rs
+++ b/lib/arena/src/lib.rs
@@ -194,6 +194,29 @@ impl<T> Arena<T> {
         self.data.iter().enumerate().map(|(idx, value)| (Idx::from_raw(RawIdx(idx as u32)), value))
     }
 
+    /// Returns an iterator over the arena’s mutable elements.
+    ///
+    /// ```
+    /// let mut arena = la_arena::Arena::new();
+    /// let idx1 = arena.alloc(20);
+    ///
+    /// assert_eq!(arena[idx1], 20);
+    ///
+    /// let mut iterator = arena.iter_mut();
+    /// *iterator.next().unwrap().1 = 10;
+    /// drop(iterator);
+    ///
+    /// assert_eq!(arena[idx1], 10);
+    /// ```
+    pub fn iter_mut(
+        &mut self,
+    ) -> impl Iterator<Item = (Idx<T>, &mut T)> + ExactSizeIterator + DoubleEndedIterator {
+        self.data
+            .iter_mut()
+            .enumerate()
+            .map(|(idx, value)| (Idx::from_raw(RawIdx(idx as u32)), value))
+    }
+
     /// Reallocates the arena to make it take up as little space as possible.
     pub fn shrink_to_fit(&mut self) {
         self.data.shrink_to_fit();
-- 
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