From 43813a71eb01949bf7a71ef36acd2df3849077c5 Mon Sep 17 00:00:00 2001
From: Emil Ernerfeldt <emilernerfeldt@gmail.com>
Date: Mon, 19 Oct 2020 20:12:14 +0200
Subject: [PATCH] [app] Add egui::app::DummyStorage

---
 egui/src/app.rs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/egui/src/app.rs b/egui/src/app.rs
index 29fe3d25..c3a39844 100644
--- a/egui/src/app.rs
+++ b/egui/src/app.rs
@@ -77,6 +77,17 @@ pub trait Storage {
     fn set_string(&mut self, key: &str, value: String);
 }
 
+/// Stores nothing.
+#[derive(Clone, Default)]
+pub struct DummyStorage {}
+
+impl Storage for DummyStorage {
+    fn get_string(&self, _key: &str) -> Option<&str> {
+        None
+    }
+    fn set_string(&mut self, _key: &str, _value: String) {}
+}
+
 #[cfg(feature = "serde_json")]
 pub fn get_value<T: serde::de::DeserializeOwned>(storage: &dyn Storage, key: &str) -> Option<T> {
     storage