From 53184829ee32708487fb6a3028f822bc3fb28e33 Mon Sep 17 00:00:00 2001
From: Maxime Coste <frrrwww@gmail.com>
Date: Tue, 10 Nov 2015 13:50:15 +0000
Subject: [PATCH] Avoid unneeded inc/dec rec in RefPtr::operator=

---
 src/ref_ptr.hh | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/src/ref_ptr.hh b/src/ref_ptr.hh
index 33a56135..b001c14a 100644
--- a/src/ref_ptr.hh
+++ b/src/ref_ptr.hh
@@ -24,11 +24,15 @@ struct RefPtr
 
     RefPtr& operator=(const RefPtr& other)
     {
-        release();
-        m_ptr = other.m_ptr;
-        acquire();
+        if (other.m_ptr != m_ptr)
+        {
+            release();
+            m_ptr = other.m_ptr;
+            acquire();
+        }
         return *this;
     }
+
     RefPtr& operator=(RefPtr&& other)
     {
         release();
@@ -40,9 +44,12 @@ struct RefPtr
 
     RefPtr& operator=(T* ptr)
     {
-        release();
-        m_ptr = ptr;
-        acquire();
+        if (ptr != m_ptr)
+        {
+            release();
+            m_ptr = ptr;
+            acquire();
+        }
         return *this;
     }