1 files changed, 36 insertions, 0 deletions
diff --git a/toolkit/crashreporter/client/app/src/ui/windows/twoway.rs b/toolkit/crashreporter/client/app/src/ui/windows/twoway.rs
new file mode 100644
index 0000000000..8a18162e08
--- /dev/null
+++ b/toolkit/crashreporter/client/app/src/ui/windows/twoway.rs
@@ -0,0 +1,36 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use std::collections::HashMap;
+
+/// A two-way hashmap.
+#[derive(Debug)]
+pub struct TwoWay<K, V> {
+    forward: HashMap<K, V>,
+    reverse: HashMap<V, K>,
+}
+
+impl<K, V> Default for TwoWay<K, V> {
+    fn default() -> Self {
+        TwoWay {
+            forward: Default::default(),
+            reverse: Default::default(),
+        }
+    }
+}
+
+impl<K: Eq + std::hash::Hash + Clone, V: Eq + std::hash::Hash + Clone> TwoWay<K, V> {
+    pub fn insert(&mut self, key: K, value: V) {
+        self.forward.insert(key.clone(), value.clone());
+        self.reverse.insert(value, key);
+    }
+
+    pub fn forward(&self) -> &HashMap<K, V> {
+        &self.forward
+    }
+
+    pub fn reverse(&self) -> &HashMap<V, K> {
+        &self.reverse
+    }
+}