copy elimination for ranges #part4

Tunnel.cpp

@@ -345,7 +345,7 @@ namespace tunnel
 	{
 		std::shared_ptr<InboundTunnel> tunnel; 
 		size_t minReceived = 0;
-		for (auto it : m_InboundTunnels)
+		for (const auto& it : m_InboundTunnels)
 		{
 			if (!it->IsEstablished ()) continue;
 			if (!tunnel || it->GetNumReceivedBytes () < minReceived)
@@ -362,7 +362,7 @@ namespace tunnel
 		if (m_OutboundTunnels.empty ()) return nullptr;
 		uint32_t ind = rand () % m_OutboundTunnels.size (), i = 0;
 		std::shared_ptr<OutboundTunnel> tunnel;
-		for (auto it: m_OutboundTunnels)
+		for (const auto& it: m_OutboundTunnels)
 		{	
 			if (it->IsEstablished ())
 			{
@@ -586,7 +586,7 @@ namespace tunnel
 						m_NumFailedTunnelCreations++;
 					}
 					else
-						it++;
+						++it;
 				break;
 				case eTunnelStateBuildFailed:
 					LogPrint (eLogDebug, "Tunnel: pending build request ", it->first, " failed, deleted");
@@ -595,7 +595,7 @@ namespace tunnel
 				break;
 				case eTunnelStateBuildReplyReceived:
 					// intermediate state, will be either established of build failed
-					it++;
+					++it;
 				break;	
 				default:
 					// success
@@ -635,7 +635,7 @@ namespace tunnel
 						if (ts + TUNNEL_EXPIRATION_THRESHOLD > tunnel->GetCreationTime () + TUNNEL_EXPIRATION_TIMEOUT)
 							tunnel->SetState (eTunnelStateExpiring);
 					}	
-					it++;
+					++it;
 				}
 			}
 		}	
@@ -738,9 +738,8 @@ namespace tunnel
 	void Tunnels::ManageTunnelPools ()
 	{
 		std::unique_lock<std::mutex> l(m_PoolsMutex);
-		for (auto it: m_Pools)
+		for (auto& pool : m_Pools)
 		{	
-			auto pool = it;
 			if (pool && pool->IsActive ())
 			{	
 				pool->CreateTunnels ();
@@ -856,7 +855,7 @@ namespace tunnel
 		int timeout = 0;
 		uint32_t ts = i2p::util::GetSecondsSinceEpoch ();
 		// TODO: possible race condition with I2PControl
-		for (auto it: m_TransitTunnels)
+		for (const auto& it : m_TransitTunnels)
 		{
 			int t = it->GetCreationTime () + TUNNEL_EXPIRATION_TIMEOUT - ts;
 			if (t > timeout) timeout = t;

TunnelGateway.cpp

@@ -197,7 +197,7 @@ namespace tunnel
 	{
 		m_Buffer.CompleteCurrentTunnelDataMessage ();
 		auto tunnelMsgs = m_Buffer.GetTunnelDataMsgs ();
-		for (auto tunnelMsg : tunnelMsgs)
+		for (auto& tunnelMsg : tunnelMsgs)
 		{	
 			m_Tunnel->EncryptTunnelMsg (tunnelMsg, tunnelMsg); 
 			tunnelMsg->FillI2NPMessageHeader (eI2NPTunnelData); 

TunnelPool.cpp

@@ -49,13 +49,13 @@ namespace tunnel
 	{
 		{
 			std::unique_lock<std::mutex> l(m_InboundTunnelsMutex);	
-			for (auto it: m_InboundTunnels)
+			for (auto& it: m_InboundTunnels)
 				it->SetTunnelPool (nullptr);
 			m_InboundTunnels.clear ();
 		}
 		{
 			std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex);
-			for (auto it: m_OutboundTunnels)
+			for (auto& it: m_OutboundTunnels)
 				it->SetTunnelPool (nullptr);
 			m_OutboundTunnels.clear ();
 		}
@@ -78,7 +78,7 @@ namespace tunnel
 		if (expiredTunnel)
 		{	
 			expiredTunnel->SetTunnelPool (nullptr);
-			for (auto it: m_Tests)
+			for (auto& it: m_Tests)
 				if (it.second.second == expiredTunnel) it.second.second = nullptr;
 
 			std::unique_lock<std::mutex> l(m_InboundTunnelsMutex);
@@ -101,7 +101,7 @@ namespace tunnel
 		if (expiredTunnel)
 		{
 			expiredTunnel->SetTunnelPool (nullptr);
-			for (auto it: m_Tests)
+			for (auto& it: m_Tests)
 				if (it.second.first == expiredTunnel) it.second.first = nullptr;
 
 			std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex);
@@ -114,7 +114,7 @@ namespace tunnel
 		std::vector<std::shared_ptr<InboundTunnel> > v;
 		int i = 0;
 		std::unique_lock<std::mutex> l(m_InboundTunnelsMutex);
-		for (auto it : m_InboundTunnels)
+		for (const auto& it : m_InboundTunnels)
 		{
 			if (i >= num) break;
 			if (it->IsEstablished ())
@@ -144,7 +144,7 @@ namespace tunnel
 		if (tunnels.empty ()) return nullptr;		
 		uint32_t ind = rand () % (tunnels.size ()/2 + 1), i = 0;
 		typename TTunnels::value_type tunnel = nullptr;
-		for (auto it: tunnels)
+		for (const auto& it: tunnels)
 		{	
 			if (it->IsEstablished () && it != excluded)
 			{
@@ -164,7 +164,7 @@ namespace tunnel
 		if (old)
 		{
 			std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex);	
-			for (auto it: m_OutboundTunnels)
+			for (const auto& it: m_OutboundTunnels)
 				if (it->IsEstablished () && old->GetEndpointIdentHash () == it->GetEndpointIdentHash ())
 				{
 					tunnel = it;
@@ -182,7 +182,7 @@ namespace tunnel
 		int num = 0;
 		{
 			std::unique_lock<std::mutex> l(m_InboundTunnelsMutex);
-			for (auto it : m_InboundTunnels)
+			for (const auto& it : m_InboundTunnels)
 				if (it->IsEstablished ()) num++;
 		}
 		for (int i = num; i < m_NumInboundTunnels; i++)
@@ -191,7 +191,7 @@ namespace tunnel
 		num = 0;
 		{
 			std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex);	
-			for (auto it : m_OutboundTunnels)
+			for (const auto& it : m_OutboundTunnels)
 				if (it->IsEstablished ()) num++;
 		}
 		for (int i = num; i < m_NumOutboundTunnels; i++)
@@ -203,11 +203,10 @@ namespace tunnel
 		decltype(m_Tests) tests;
 		{
 			std::unique_lock<std::mutex> l(m_TestsMutex);
-			tests = m_Tests;
-			m_Tests.clear ();
+			tests.swap(m_Tests);
 		}
 
-		for (auto it: tests)
+		for (auto& it: tests)
 		{
 			LogPrint (eLogWarning, "Tunnels: test of tunnel ", it.first, " failed");
 			// if test failed again with another tunnel we consider it failed
@@ -248,12 +247,12 @@ namespace tunnel
 			if ((*it1)->IsFailed ())
 			{	
 				failed = true;
-				it1++;
+				++it1;
 			}
 			if ((*it2)->IsFailed ())
 			{	
 				failed = true;
-				it2++;
+				++it2;
 			}
 			if (!failed)
 			{
@@ -265,7 +264,7 @@ namespace tunnel
 				}
  				(*it1)->SendTunnelDataMsg ((*it2)->GetNextIdentHash (), (*it2)->GetNextTunnelID (),
 					CreateDeliveryStatusMsg (msgID));
-				it1++; it2++;
+				++it1; ++it2;
 			}	
 		}
 	}

UPnP.cpp

@@ -122,8 +122,8 @@ namespace transport
 
 	void UPnP::PortMapping ()
 	{
-		auto a = context.GetRouterInfo().GetAddresses();
-        for (auto address : a)
+		const auto& a = context.GetRouterInfo().GetAddresses();
+		for (const auto& address : a)
         {
             if (!address->host.is_v6 ())
             	TryPortMapping (address);
@@ -139,8 +139,8 @@ namespace transport
 
 	void UPnP::CloseMapping ()
 	{
-		auto a = context.GetRouterInfo().GetAddresses();
-        for (auto address : a)
+		const auto& a = context.GetRouterInfo().GetAddresses();
+		for (const auto& address : a)
         {
             if (!address->host.is_v6 ())
             	CloseMapping (address);