X-Git-Url: http://g0dil.de/git?a=blobdiff_plain;f=senf%2FPackets%2FPacket.cti;h=ecb8baa4bb0f8bafcfb0e17a0ffab67e97e052a2;hb=9bc655e14d2d8c204ed835896cb51e42d49bd68f;hp=5d79a2b65c74d80c0024074618f6d4e5d7bfce2f;hpb=9cb871b939efe93e35dd96808d25089399acfc46;p=senf.git

diff --git a/senf/Packets/Packet.cti b/senf/Packets/Packet.cti
index 5d79a2b..ecb8baa 100644
--- a/senf/Packets/Packet.cti
+++ b/senf/Packets/Packet.cti
@@ -37,7 +37,7 @@
 // conversion constructors
 
 template <class PacketType>
-prefix_ senf::Packet::Packet(ConcretePacket<PacketType> packet)
+prefix_ senf::Packet::Packet(ConcretePacket<PacketType> const & packet)
     : packet_(packet.ptr())
 {}
 
@@ -54,7 +54,7 @@ template <class OtherPacket>
 prefix_ bool senf::Packet::is()
     const
 {
-    return ptr()->is<typename OtherPacket::type>();
+    return valid() && ptr()->is<typename OtherPacket::type>();
 }
 
 template <class OtherPacket>
@@ -312,7 +312,7 @@ senf::ConcretePacket<PacketType>::operator->()
 // private members
 
 template <class PacketType>
-prefix_ senf::ConcretePacket<PacketType>::ConcretePacket(typename interpreter::ptr packet_)
+prefix_ senf::ConcretePacket<PacketType>::ConcretePacket(typename interpreter::ptr const & packet_)
     : Packet(packet_)
 {}