X-Git-Url: http://g0dil.de/git?a=blobdiff_plain;f=senf%2FPackets%2FPacket.cti;h=ecb8baa4bb0f8bafcfb0e17a0ffab67e97e052a2;hb=84f14a42f9993e186c7897ce0db021300e0a2d48;hp=21600c66040371b0608a92b0b34999b35cfd2818;hpb=3a3350157a52c268d5082a4aac4aba643417071f;p=senf.git

diff --git a/senf/Packets/Packet.cti b/senf/Packets/Packet.cti
index 21600c6..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>
@@ -232,7 +232,7 @@ senf::ConcretePacket<PacketType>::createAfter(Packet const & packet, size_type s
 
 template <class PacketType>
 prefix_ senf::ConcretePacket<PacketType>
-senf::ConcretePacket<PacketType>::createAfter(Packet const & packet, size_type size, 
+senf::ConcretePacket<PacketType>::createAfter(Packet const & packet, size_type size,
                                               senf::NoInit_t)
 {
     return ConcretePacket(interpreter::createAfter(packet.ptr(), size, senf::noinit));
@@ -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_)
 {}