Core/Objects: fixed packet guid writing

src/server/game/Entities/Object/ObjectGuid.cpp

@@ -117,6 +117,12 @@ ByteBuffer& operator<<(ByteBuffer& buf, PackedGuid const& guid)
     return buf;
 }
 
+ByteBuffer& operator<<(ByteBuffer& buf, PackedGuidWriter const& guid)
+{
+    buf.appendPackGUID(guid.Guid.GetRawValue());
+    return buf;
+}
+
 ByteBuffer& operator>>(ByteBuffer& buf, PackedGuidReader const& guid)
 {
     buf.readPackGUID(reinterpret_cast<uint64&>(guid.Guid));

src/server/game/Entities/Object/ObjectGuid.h

@@ -129,6 +129,12 @@ struct PackedGuidReader
     ObjectGuid& Guid;
 };
 
+struct PackedGuidWriter
+{
+    explicit PackedGuidWriter(ObjectGuid const& guid) : Guid(guid) { }
+    ObjectGuid const& Guid;
+};
+
 class TC_GAME_API ObjectGuid
 {
     public:
@@ -158,7 +164,7 @@ class TC_GAME_API ObjectGuid
         void Set(uint64 guid) { _data._guid = guid; }
         void Clear() { _data._guid = 0; }
 
-        PackedGuid WriteAsPacked() const;
+        PackedGuidWriter WriteAsPacked() const { return PackedGuidWriter(*this); }
 
         uint64   GetRawValue() const { return _data._guid; }
         HighGuid GetHigh() const
@@ -343,10 +349,9 @@ TC_GAME_API ByteBuffer& operator<<(ByteBuffer& buf, ObjectGuid const& guid);
 TC_GAME_API ByteBuffer& operator>>(ByteBuffer& buf, ObjectGuid&       guid);
 
 TC_GAME_API ByteBuffer& operator<<(ByteBuffer& buf, PackedGuid const& guid);
+TC_GAME_API ByteBuffer& operator<<(ByteBuffer& buf, PackedGuidWriter const& guid);
 TC_GAME_API ByteBuffer& operator>>(ByteBuffer& buf, PackedGuidReader const& guid);
 
-inline PackedGuid ObjectGuid::WriteAsPacked() const { return PackedGuid(*this); }
-
 namespace std
 {
     template<>