From 3f2160ae198be9b7d4f786a4c406116c8c3f167d Mon Sep 17 00:00:00 2001
From: Max Prokhorov <prokhorov.max@outlook.com>
Date: Thu, 7 Feb 2019 17:12:15 +0300
Subject: [PATCH] avoid copying callback std::function

---
 code/espurna/ws.ino | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/code/espurna/ws.ino b/code/espurna/ws.ino
index 39f1b865..4ed0a899 100644
--- a/code/espurna/ws.ino
+++ b/code/espurna/ws.ino
@@ -411,7 +411,7 @@ void _wsStart(uint32_t client_id) {
         return;
     }
 
-    for (auto callback : _ws_on_send_callbacks) {
+    for (auto& callback : _ws_on_send_callbacks) {
         callback(root);
     }