From 34bf3b4833bcded73646ee5c702dfae52fb8f86b Mon Sep 17 00:00:00 2001
From: Henrik Kinnunen <fluxgen at fluxbox dot org>
Date: Sun, 20 Feb 2011 15:48:42 +0100
Subject: Fixed a possible crash when using a slot m_holder = 0

---
 src/FbTk/Slot.hh | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/FbTk/Slot.hh b/src/FbTk/Slot.hh
index ba3cfc4..9080d53 100644
--- a/src/FbTk/Slot.hh
+++ b/src/FbTk/Slot.hh
@@ -229,7 +229,8 @@ public:
     }
 
     void operator()() {
-       reinterpret_cast<CallbackType>(m_holder->m_callback)( m_holder );
+        if (m_holder)
+            reinterpret_cast<CallbackType>(m_holder->m_callback)( m_holder );
     }
 };
 
@@ -247,7 +248,8 @@ public:
     }
 
     void operator()(Arg1 arg) {
-        reinterpret_cast<CallbackType>(m_holder->m_callback)(m_holder, arg);
+        if (m_holder)
+            reinterpret_cast<CallbackType>(m_holder->m_callback)(m_holder, arg);
     }
 
 };
@@ -265,7 +267,8 @@ public:
     }
 
     void operator()(Arg1 arg1, Arg2 arg2) {
-        reinterpret_cast<CallbackType>(m_holder->m_callback)(m_holder, arg1, arg2);
+        if (m_holder)
+            reinterpret_cast<CallbackType>(m_holder->m_callback)(m_holder, arg1, arg2);
     }
 };
 
@@ -282,8 +285,9 @@ public:
     }
 
     void operator()(Arg1 arg1, Arg2 arg2, Arg3 arg3) {
-        reinterpret_cast<CallbackType>(m_holder->m_callback)
-            ( m_holder, arg1, arg2, arg3 );
+        if (m_holder)
+            reinterpret_cast<CallbackType>(m_holder->m_callback)
+                ( m_holder, arg1, arg2, arg3 );
     }
 };
 
-- 
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