diff --git a/Global.h b/Global.h
index 73b5e4bbc..32610cd3b 100644
--- a/Global.h
+++ b/Global.h
@@ -331,7 +331,8 @@ namespace vstd
 	{
 		assert(r.size());
 		index %= r.size();
-		auto itr = std::begin(r);
+		// auto itr = std::begin(r); //not available in gcc-4.5
+		auto itr = r.begin();
 		std::advance(itr, index);
 		return *itr;
 	}
diff --git a/lib/BattleState.cpp b/lib/BattleState.cpp
index a37ebd10d..f156f84c1 100644
--- a/lib/BattleState.cpp
+++ b/lib/BattleState.cpp
@@ -2597,7 +2597,7 @@ shared_ptr<CObstacleInstance> BattleInfo::getObstacleOnTile(BattleHex tile) cons
 		if(vstd::contains(obs->getAffectedTiles(), tile))
 			return obs;
 
-	return NULL;
+	return shared_ptr<CObstacleInstance>();
 }
 
 const CStack * BattleInfo::getStackIf(boost::function<bool(const CStack*)> pred) const
diff --git a/lib/CGameState.cpp b/lib/CGameState.cpp
index 092338c76..cf6bff293 100644
--- a/lib/CGameState.cpp
+++ b/lib/CGameState.cpp
@@ -592,7 +592,7 @@ std::pair<int,int> CGameState::pickObject (CGObjectInstance *obj)
 
 			//golem factory is not in list of cregens but can be placed as random object
 			static const int factoryCreatures[] = {32, 33, 116, 117};
-			std::vector<int> factory(std::begin(factoryCreatures), std::end(factoryCreatures));
+			std::vector<int> factory(factoryCreatures, factoryCreatures + ARRAY_COUNT(factoryCreatures));
 			if (vstd::contains(factory, cid))
 				result = std::pair<int,int>(20, 1);
 
diff --git a/lib/CObjectHandler.cpp b/lib/CObjectHandler.cpp
index 38cc8af3b..f5e6ee8ee 100644
--- a/lib/CObjectHandler.cpp
+++ b/lib/CObjectHandler.cpp
@@ -2360,7 +2360,7 @@ void CGTownInstance::recreateBuildingsBonuses()
 
 bool CGTownInstance::addBonusIfBuilt(int building, int type, int val, int subtype /*= -1*/)
 {
-	return addBonusIfBuilt(building, type, val, NULL, subtype);
+	return addBonusIfBuilt(building, type, val, TPropagatorPtr(), subtype);
 }
 
 bool CGTownInstance::addBonusIfBuilt(int building, int type, int val, TPropagatorPtr prop, int subtype /*= -1*/)
diff --git a/lib/CObstacleInstance.cpp b/lib/CObstacleInstance.cpp
index 726963c04..4a040b9e0 100644
--- a/lib/CObstacleInstance.cpp
+++ b/lib/CObstacleInstance.cpp
@@ -134,5 +134,5 @@ std::vector<BattleHex> MoatObstacle::getAffectedTiles() const
 {
 	//rrr... need initializer lists
 	static const BattleHex moatHexes[] = {11, 28, 44, 61, 77, 111, 129, 146, 164, 181};
-	return std::vector<BattleHex>(std::begin(moatHexes), std::end(moatHexes));
+	return std::vector<BattleHex>(moatHexes, moatHexes + ARRAY_COUNT(moatHexes));
 }
\ No newline at end of file
diff --git a/lib/IGameCallback.cpp b/lib/IGameCallback.cpp
index 6e212e6e3..7eb151504 100644
--- a/lib/IGameCallback.cpp
+++ b/lib/IGameCallback.cpp
@@ -416,7 +416,7 @@ const CGHeroInstance * CBattleInfoCallback::battleGetFightingHero(ui8 side) cons
 shared_ptr<const CObstacleInstance> CBattleInfoCallback::battleGetObstacleOnPos(BattleHex tile, bool onlyBlocking /*= true*/)
 {
 	if(!gs->curB)
-		return NULL;
+		return shared_ptr<const CObstacleInstance>();
 
 	BOOST_FOREACH(auto &obs, battleGetAllObstacles())
 	{
@@ -426,7 +426,7 @@ shared_ptr<const CObstacleInstance> CBattleInfoCallback::battleGetObstacleOnPos(
 			return obs;
 		}
 	}
-	return NULL;
+	return shared_ptr<const CObstacleInstance>();
 }
 
 int CBattleInfoCallback::battleGetMoatDmg()
diff --git a/server/CGameHandler.cpp b/server/CGameHandler.cpp
index 6da4e8451..35a71b446 100644
--- a/server/CGameHandler.cpp
+++ b/server/CGameHandler.cpp
@@ -999,7 +999,7 @@ int CGameHandler::moveStack(int stack, BattleHex dest)
 	{
 		// send one package with the creature path information
 
-		shared_ptr<const CObstacleInstance> obstacle = NULL; //obstacle that interrupted movement
+		shared_ptr<const CObstacleInstance> obstacle; //obstacle that interrupted movement
 		std::vector<BattleHex> tiles;
 		int tilesToMove = std::max((int)(path.first.size() - creSpeed), 0);
 		int v = path.first.size()-1;
@@ -1036,7 +1036,7 @@ startWalking:
 			//if stack didn't die in explosion, continue movement
 			if(!obstacle->stopsMovement() && curStack->alive())
 			{
-				obstacle = NULL;
+				obstacle.reset();
 				tiles.clear();
 				v--;
 				goto startWalking; //TODO it's so evil