From 57b6967ddd1c674674b75fd96b7e354caa7cb733 Mon Sep 17 00:00:00 2001
From: Jakob Stoklund Olesen <jolesen@mozilla.com>
Date: Tue, 20 Sep 2016 09:48:00 -0700
Subject: [PATCH] Add clear, is_empty, and resize methods to EntityMap.

These are simply forwards from the underlying Vec.
---
 src/libcretonne/entity_map.rs | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/libcretonne/entity_map.rs b/src/libcretonne/entity_map.rs
index 2a76e3cce9..74c3cf5c46 100644
--- a/src/libcretonne/entity_map.rs
+++ b/src/libcretonne/entity_map.rs
@@ -70,6 +70,16 @@ impl<K, V> EntityMap<K, V>
         k.index() < self.elems.len()
     }
 
+    /// Is this map completely empty?
+    pub fn is_empty(&self) -> bool {
+        self.elems.is_empty()
+    }
+
+    /// Remove all entries from this map.
+    pub fn clear(&mut self) {
+        self.elems.clear()
+    }
+
     /// Iterate over all the keys in this map.
     pub fn keys(&self) -> Keys<K> {
         Keys {
@@ -137,12 +147,17 @@ impl<K, V> EntityMap<K, V>
         map
     }
 
+    /// Resize the map to have `n` entries by adding default entries as needed.
+    pub fn resize(&mut self, n: usize) {
+        self.elems.resize(n, V::default());
+    }
+
     /// Ensure that `k` is a valid key but adding default entries if necesssary.
     ///
     /// Return a mutable reference to the corresponding entry.
     pub fn ensure(&mut self, k: K) -> &mut V {
         if !self.is_valid(k) {
-            self.elems.resize(k.index() + 1, V::default())
+            self.resize(k.index() + 1)
         }
         &mut self.elems[k.index()]
     }