From 41806e2e07726604538e58e9960326c4c0a0bf14 Mon Sep 17 00:00:00 2001
From: Arvid Norberg <arvid@libtorrent.org>
Date: Mon, 24 Jan 2011 18:20:41 +0000
Subject: [PATCH] make alert_cast<> support 0

---
 include/libtorrent/alert.hpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/libtorrent/alert.hpp b/include/libtorrent/alert.hpp
index f51c31c10..c0a57ff80 100644
--- a/include/libtorrent/alert.hpp
+++ b/include/libtorrent/alert.hpp
@@ -219,6 +219,7 @@ namespace libtorrent {
 template <class T>
 T* alert_cast(alert* a)
 {
+	if (a == 0) return 0;
 	if (a->type() == T::alert_type) return static_cast<T*>(a);
 	return 0;
 }
@@ -226,6 +227,7 @@ T* alert_cast(alert* a)
 template <class T>
 T const* alert_cast(alert const* a)
 {
+	if (a == 0) return 0;
 	if (a->type() == T::alert_type) return static_cast<T const*>(a);
 	return 0;
 }