better fields access

include/examples/KeepAlivePacket.h

@@ -10,11 +10,26 @@ enum KeepAlivePacketFields {
 };
 
 using KeepAliveFields = std::tuple<
-	std::uint64_t, 						//<- KeepAliveId 
+	std::uint64_t,			 				//<- KeepAliveId
 	sp::BitField<std::uint16_t, 
-		sp::Field<std::uint16_t, 12>, 	//<- m_Tower 
-		sp::Field<std::uint8_t, 4> 		//<- m_Upgrade 
-	>		
->;
+		sp::Field<std::uint16_t, 12>,  		//<- m_Tower
+		sp::Field<std::uint8_t, 4>			//<- m_Upgrade
+		>
+	>;
 
-DeclarePacket(KeepAlive);
+DeclarePacket(KeepAlive){
+  public: 
+	PacketConstructor(KeepAlive)
+
+	std::uint64_t GetKeepAliveId() const {
+		return GetField<KeepAlive>();
+	}
+
+	std::uint16_t GetTowerId() const {
+		return GetField<TestAlignField>().GetField<0>();
+	}
+
+	std::uint8_t GetTowerUpgrade() const {
+		return GetField<TestAlignField>().GetField<1>();
+	}
+};