From 6aee9994b9d4a1cb266598614f640ce93e8f0644 Mon Sep 17 00:00:00 2001
From: Benjamin Reis <benjamin.reis@belledonne-communications.com>
Date: Wed, 6 Dec 2017 14:22:37 +0100
Subject: [PATCH] use const string ref when possible

---
 src/chat/notification/imdn.cpp | 2 +-
 src/chat/notification/imdn.h   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/chat/notification/imdn.cpp b/src/chat/notification/imdn.cpp
index 72ed7eb20..39081659c 100644
--- a/src/chat/notification/imdn.cpp
+++ b/src/chat/notification/imdn.cpp
@@ -32,7 +32,7 @@ LINPHONE_BEGIN_NAMESPACE
 
 const string Imdn::imdnPrefix = "/imdn:imdn";
 
-string Imdn::createXml (string id, time_t time, Imdn::Type imdnType, LinphoneReason reason) {
+string Imdn::createXml (const string &id, time_t time, Imdn::Type imdnType, LinphoneReason reason) {
 	xmlBufferPtr buf;
 	xmlTextWriterPtr writer;
 	int err;
diff --git a/src/chat/notification/imdn.h b/src/chat/notification/imdn.h
index 15e41905a..de89edb6c 100644
--- a/src/chat/notification/imdn.h
+++ b/src/chat/notification/imdn.h
@@ -37,7 +37,7 @@ public:
 		Display
 	};
 
-	static std::string createXml(std::string id, time_t time, Imdn::Type imdnType, LinphoneReason reason);
+	static std::string createXml (const std::string &id, time_t time, Imdn::Type imdnType, LinphoneReason reason);
 	static void parse (ChatRoom &cr, const std::string &content);
 
 private: