eliminate extra copy

TunnelGateway.cpp

@@ -107,12 +107,9 @@ namespace tunnel
 		}			
 	}
 	
-	const std::vector<I2NPMessage *> TunnelGatewayBuffer::GetTunnelDataMsgs ()
+	void TunnelGatewayBuffer::ClearTunnelDataMsgs ()
 	{
-		CompleteCurrentTunnelDataMessage ();
-		std::vector<I2NPMessage *> ret = m_TunnelDataMsgs; // TODO: implement it better
 		m_TunnelDataMsgs.clear ();
-		return ret;
 	}
 
 	void TunnelGatewayBuffer::CreateCurrentTunnelDataMessage ()
@@ -162,6 +159,7 @@ namespace tunnel
 
 	void TunnelGateway::SendBuffer ()
 	{
+		m_Buffer.CompleteCurrentTunnelDataMessage ();
 		auto tunnelMsgs = m_Buffer.GetTunnelDataMsgs ();
 		for (auto tunnelMsg : tunnelMsgs)
 		{	
@@ -170,6 +168,7 @@ namespace tunnel
 			i2p::transports.SendMessage (m_Tunnel->GetNextIdentHash (), tunnelMsg);
 			m_NumSentBytes += TUNNEL_DATA_MSG_SIZE;
 		}	
+		m_Buffer.ClearTunnelDataMsgs ();
 	}	
 }		
 }	

TunnelGateway.h

@@ -16,12 +16,13 @@ namespace tunnel
 			TunnelGatewayBuffer (uint32_t tunnelID): m_TunnelID (tunnelID), 
 				m_CurrentTunnelDataMsg (nullptr), m_RemainingSize (0) {};
 			void PutI2NPMsg (const TunnelMessageBlock& block);	
-			const std::vector<I2NPMessage *> GetTunnelDataMsgs ();
+			const std::vector<I2NPMessage *>& GetTunnelDataMsgs () const { return m_TunnelDataMsgs; };
+			void ClearTunnelDataMsgs ();
+			void CompleteCurrentTunnelDataMessage ();
 
 		private:
 
 			void CreateCurrentTunnelDataMessage ();
-			void CompleteCurrentTunnelDataMessage ();
 			
 		private: