diff --git a/AI/Nullkiller/Analyzers/BuildAnalyzer.cpp b/AI/Nullkiller/Analyzers/BuildAnalyzer.cpp
index 314b4174f..d719c03f4 100644
--- a/AI/Nullkiller/Analyzers/BuildAnalyzer.cpp
+++ b/AI/Nullkiller/Analyzers/BuildAnalyzer.cpp
@@ -334,7 +334,7 @@ BuildingInfo::BuildingInfo()
 	buildCost = 0;
 	buildCostWithPrerequisits = 0;
 	prerequisitesCount = 0;
-	name = "";
+	name.clear();
 	armyStrength = 0;
 }
 
diff --git a/client/CVideoHandler.cpp b/client/CVideoHandler.cpp
index afe18c924..31c2cebf6 100644
--- a/client/CVideoHandler.cpp
+++ b/client/CVideoHandler.cpp
@@ -381,7 +381,7 @@ void CVideoPlayer::update( int x, int y, SDL_Surface *dst, bool forceRedraw, boo
 
 void CVideoPlayer::close()
 {
-	fname = "";
+	fname.clear();
 	if (sws)
 	{
 		sws_freeContext(sws);
diff --git a/client/widgets/AdventureMapClasses.cpp b/client/widgets/AdventureMapClasses.cpp
index b0d351a2b..1a4be8d59 100644
--- a/client/widgets/AdventureMapClasses.cpp
+++ b/client/widgets/AdventureMapClasses.cpp
@@ -1158,7 +1158,7 @@ void CInGameConsole::endEnteringText(bool printEnteredText)
 		previouslyEntered.push_back(txt);
 		//print(txt);
 	}
-	enteredText = "";
+	enteredText.clear();
 	if(GH.topInt() == adventureInt)
 	{
 		GH.statusbar->alignment = CENTER;
diff --git a/client/widgets/CArtifactHolder.cpp b/client/widgets/CArtifactHolder.cpp
index 746b2fc0c..2800b579e 100644
--- a/client/widgets/CArtifactHolder.cpp
+++ b/client/widgets/CArtifactHolder.cpp
@@ -367,7 +367,7 @@ void CHeroArtPlace::setArtifact(const CArtifactInstance *art)
 	if(!art)
 	{
 		image->disable();
-		text = std::string();
+		text.clear();
 		hoverText = CGI->generaltexth->allTexts[507];
 		return;
 	}
@@ -1034,7 +1034,7 @@ void CCommanderArtPlace::setArtifact(const CArtifactInstance * art)
 	if (!art)
 	{
 		image->disable();
-		text = std::string();
+		text.clear();
 		return;
 	}
 
diff --git a/client/widgets/TextControls.cpp b/client/widgets/TextControls.cpp
index b7854f127..96a0ec71c 100644
--- a/client/widgets/TextControls.cpp
+++ b/client/widgets/TextControls.cpp
@@ -577,7 +577,7 @@ void CTextInput::textInputed(const SDL_TextInputEvent & event)
 		redraw();
 		cb(text);
 	}
-	newText = "";
+	newText.clear();
 
 #ifdef VCMI_ANDROID
 	notifyAndroidTextInputChanged(text);
diff --git a/client/windows/CAdvmapInterface.cpp b/client/windows/CAdvmapInterface.cpp
index 538fc554d..e75a22297 100644
--- a/client/windows/CAdvmapInterface.cpp
+++ b/client/windows/CAdvmapInterface.cpp
@@ -573,7 +573,7 @@ CAdvMapInt::CAdvMapInt():
 	strongInterest = true; // handle all mouse move events to prevent dead mouse move space in fullscreen mode
 	townList.onSelect = std::bind(&CAdvMapInt::selectionChanged,this);
 	bg = BitmapHandler::loadBitmap(ADVOPT.mainGraphic);
-	if (ADVOPT.worldViewGraphic != "")
+	if(!ADVOPT.worldViewGraphic.empty())
 	{
 		bgWorldView = BitmapHandler::loadBitmap(ADVOPT.worldViewGraphic);
 	}
diff --git a/client/windows/CSpellWindow.cpp b/client/windows/CSpellWindow.cpp
index ad48699e2..b5dcd5e93 100644
--- a/client/windows/CSpellWindow.cpp
+++ b/client/windows/CSpellWindow.cpp
@@ -593,7 +593,7 @@ void CSpellWindow::SpellArea::clickRight(tribool down, bool previousState)
 		std::string dmgInfo;
 		auto causedDmg = owner->myInt->cb->estimateSpellDamage(mySpell, owner->myHero);
 		if(causedDmg == 0 || mySpell->id == SpellID::TITANS_LIGHTNING_BOLT) //Titan's Lightning Bolt already has damage info included
-			dmgInfo = "";
+			dmgInfo.clear();
 		else
 		{
 			dmgInfo = CGI->generaltexth->allTexts[343];
diff --git a/client/windows/CTradeWindow.cpp b/client/windows/CTradeWindow.cpp
index 05091a70d..63381e08e 100644
--- a/client/windows/CTradeWindow.cpp
+++ b/client/windows/CTradeWindow.cpp
@@ -192,7 +192,7 @@ void CTradeWindow::CTradeableItem::clickLeft(tribool down, bool previousState)
 
 				aw->arts->artifactsOnAltar.erase(art);
 				setID(-1);
-				subtitle = "";
+				subtitle.clear();
 				aw->deal->block(!aw->arts->artifactsOnAltar.size());
 			}
 
diff --git a/lib/CArtHandler.cpp b/lib/CArtHandler.cpp
index ee57823f9..a6a6b1031 100644
--- a/lib/CArtHandler.cpp
+++ b/lib/CArtHandler.cpp
@@ -352,7 +352,7 @@ CArtifact * CArtHandler::loadFromJson(const std::string & scope, const JsonNode
 	}
 
 	const JsonNode & warMachine = node["warMachine"];
-	if(warMachine.getType() == JsonNode::JsonType::DATA_STRING && warMachine.String() != "")
+	if(warMachine.getType() == JsonNode::JsonType::DATA_STRING && !warMachine.String().empty())
 	{
 		VLC->modh->identifiers.requestIdentifier("creature", warMachine, [=](si32 id)
 		{
diff --git a/lib/CBonusTypeHandler.cpp b/lib/CBonusTypeHandler.cpp
index 00342ec9f..7edd984b4 100644
--- a/lib/CBonusTypeHandler.cpp
+++ b/lib/CBonusTypeHandler.cpp
@@ -94,7 +94,9 @@ std::string MacroString::build(const GetValue & getValue) const
 CBonusType::CBonusType()
 {
 	hidden = true;
-	icon = nameTemplate = descriptionTemplate = "";
+	icon.clear();
+	nameTemplate.clear();
+	descriptionTemplate.clear();
 }
 
 CBonusType::~CBonusType()
diff --git a/lib/CCreatureSet.cpp b/lib/CCreatureSet.cpp
index 412316449..2e3bbc8f2 100644
--- a/lib/CCreatureSet.cpp
+++ b/lib/CCreatureSet.cpp
@@ -1052,7 +1052,7 @@ void CStackBasicDescriptor::serializeJson(JsonSerializeFormat & handler)
 	{
 		std::string typeName("");
 		handler.serializeString("type", typeName);
-		if(typeName != "")
+		if(!typeName.empty())
 			setType(VLC->creh->getCreature("core", typeName));
 	}
 }
diff --git a/lib/CGameState.cpp b/lib/CGameState.cpp
index d2482bb99..823989e24 100644
--- a/lib/CGameState.cpp
+++ b/lib/CGameState.cpp
@@ -532,7 +532,7 @@ std::pair<Obj,int> CGameState::pickObject (CGObjectInstance *obj)
 			if (auto info = dynamic_cast<CCreGenAsCastleInfo*>(dwl->info))
 			{
 				faction = getRandomGenerator().nextInt((int)VLC->townh->size() - 1);
-				if(info->asCastle && info->instanceId != "")
+				if(info->asCastle && !info->instanceId.empty())
 				{
 					auto iter = map->instanceNames.find(info->instanceId);
 
diff --git a/lib/CModHandler.cpp b/lib/CModHandler.cpp
index 3d112f0ed..fdf5229ab 100644
--- a/lib/CModHandler.cpp
+++ b/lib/CModHandler.cpp
@@ -226,7 +226,7 @@ std::vector<CIdentifierStorage::ObjectData> CIdentifierStorage::getPossibleIdent
 
 		//for map format support core mod has access to any mod
 		//TODO: better solution for access from map?
-		if(request.localScope == "core" || request.localScope == "")
+		if(request.localScope == "core" || request.localScope.empty())
 		{
 			allowedScopes.insert(request.remoteScope);
 		}
@@ -1116,13 +1116,13 @@ void CModHandler::parseIdentifier(const std::string & fullIdentifier, std::strin
 	else
 	{
 		type = p.second;
-		identifier = "";
+		identifier.clear();
 	}
 }
 
 std::string CModHandler::makeFullIdentifier(const std::string & scope, const std::string & type, const std::string & identifier)
 {
-	if(type == "")
+	if(type.empty())
 		logGlobal->error("Full identifier (%s %s) requires type name", scope, identifier);
 
 	std::string actualScope = scope;
@@ -1137,13 +1137,13 @@ std::string CModHandler::makeFullIdentifier(const std::string & scope, const std
 		actualName = scopeAndName.second;
 	}
 
-	if(actualScope == "")
+	if(actualScope.empty())
 	{
-		return actualName == "" ? type : type + "." + actualName;
+		return actualName.empty() ? type : type + "." + actualName;
 	}
 	else
 	{
-		return actualName == "" ? actualScope+ ":" + type : actualScope + ":" + type + "." + actualName;
+		return actualName.empty() ? actualScope+ ":" + type : actualScope + ":" + type + "." + actualName;
 	}
 }
 
diff --git a/lib/CPathfinder.cpp b/lib/CPathfinder.cpp
index bc2fca93d..86aea5b07 100644
--- a/lib/CPathfinder.cpp
+++ b/lib/CPathfinder.cpp
@@ -1252,7 +1252,7 @@ int CPathfinderHelper::getMovementCost(
 	if(src.x != dst.x && src.y != dst.y) //it's diagonal move
 	{
 		int old = ret;
-		ret = static_cast < int>(ret * 1.414213);
+		ret = static_cast<int>(ret * M_SQRT2);
 		//diagonal move costs too much but normal move is possible - allow diagonal move for remaining move points
 		if(ret > remainingMovePoints && remainingMovePoints >= old)
 		{
diff --git a/lib/CTownHandler.cpp b/lib/CTownHandler.cpp
index c50d097d4..ced8fdf0b 100644
--- a/lib/CTownHandler.cpp
+++ b/lib/CTownHandler.cpp
@@ -822,11 +822,11 @@ void CTownHandler::loadClientData(CTown &town, const JsonNode & source)
 	info.buildingsIcons = source["buildingsIcons"].String();
 
 	//left for back compatibility - will be removed later
-	if (source["guildBackground"].String() != "")
+	if(!source["guildBackground"].String().empty())
 		info.guildBackground = source["guildBackground"].String();
 	else
 		info.guildBackground = "TPMAGE.bmp";
-	if (source["tavernVideo"].String() != "")
+	if(!source["tavernVideo"].String().empty())
 	    info.tavernVideo = source["tavernVideo"].String();
 	else
 		info.tavernVideo = "TAVERN.BIK";
@@ -963,7 +963,6 @@ TerrainId CTownHandler::getDefaultTerrainForAlignment(EAlignment::EAlignment ali
 CFaction * CTownHandler::loadFromJson(const std::string & scope, const JsonNode & source, const std::string & identifier, size_t index)
 {
 	auto faction = new CFaction();
-	faction->index = index;
 
 	faction->index = static_cast<TFaction>(index);
 	faction->name = source["name"].String();
diff --git a/lib/HeroBonus.cpp b/lib/HeroBonus.cpp
index b43346658..5dd53bbbd 100644
--- a/lib/HeroBonus.cpp
+++ b/lib/HeroBonus.cpp
@@ -1016,7 +1016,7 @@ TConstBonusListPtr CBonusSystemNode::getAllBonuses(const CSelector &selector, co
 
 		// If a bonus system request comes with a caching string then look up in the map if there are any
 		// pre-calculated bonus results. Limiters can't be cached so they have to be calculated.
-		if (cachingStr != "")
+		if(!cachingStr.empty())
 		{
 			auto it = cachedRequests.find(cachingStr);
 			if(it != cachedRequests.end())
@@ -1032,7 +1032,7 @@ TConstBonusListPtr CBonusSystemNode::getAllBonuses(const CSelector &selector, co
 		cachedBonuses.getBonuses(*ret, selector, limit);
 
 		// Save the results in the cache
-		if(cachingStr != "")
+		if(!cachingStr.empty())
 			cachedRequests[cachingStr] = ret;
 
 		return ret;
@@ -1708,9 +1708,9 @@ JsonNode Bonus::toJsonNode() const
 		root["val"].Integer() = val;
 	if(valType != ADDITIVE_VALUE)
 		root["valueType"].String() = vstd::findKey(bonusValueMap, valType);
-	if(stacking != "")
+	if(!stacking.empty())
 		root["stacking"].String() = stacking;
-	if(description != "")
+	if(!description.empty())
 		root["description"].String() = description;
 	if(effectRange != NO_LIMIT)
 		root["effectRange"].String() = vstd::findKey(bonusLimitEffect, effectRange);
diff --git a/lib/battle/CBattleInfoCallback.cpp b/lib/battle/CBattleInfoCallback.cpp
index 8d891a8f6..7f309e876 100644
--- a/lib/battle/CBattleInfoCallback.cpp
+++ b/lib/battle/CBattleInfoCallback.cpp
@@ -55,7 +55,7 @@ static void retrieveTurretDamageRange(const CGTownInstance * town, const battle:
 	const int baseDamage = 15;
 
 	outMinDmg = multiplier * (baseDamage + town->getTownLevel() * 3);
-	outMaxDmg = multiplier * (baseDamage + town->getTownLevel() * 3);
+	outMaxDmg = outMinDmg;
 }
 
 static BattleHex lineToWallHex(int line) //returns hex with wall in given line (y coordinate)
diff --git a/lib/mapObjects/CGTownInstance.cpp b/lib/mapObjects/CGTownInstance.cpp
index 9afffeaee..4206b9fc8 100644
--- a/lib/mapObjects/CGTownInstance.cpp
+++ b/lib/mapObjects/CGTownInstance.cpp
@@ -46,7 +46,7 @@ void CCreGenAsCastleInfo::serializeJson(JsonSerializeFormat & handler)
 
 	if(!handler.saving)
 	{
-		asCastle = (instanceId != "");
+		asCastle = !instanceId.empty();
 		allowedFactions.clear();
 	}
 
diff --git a/lib/mapObjects/CObjectClassesHandler.cpp b/lib/mapObjects/CObjectClassesHandler.cpp
index 2b9d87392..5f2810ed5 100644
--- a/lib/mapObjects/CObjectClassesHandler.cpp
+++ b/lib/mapObjects/CObjectClassesHandler.cpp
@@ -572,7 +572,7 @@ void AObjectTypeHandler::addTemplate(JsonNode config)
 	auto tmpl = new ObjectTemplate;
 	tmpl->id = Obj(type);
 	tmpl->subid = subtype;
-	tmpl->stringID = ""; // TODO?
+	tmpl->stringID.clear(); // TODO?
 	tmpl->readJson(config);
 	templates.emplace_back(tmpl);
 }
diff --git a/lib/mapObjects/CQuest.cpp b/lib/mapObjects/CQuest.cpp
index 04aa4efac..a63ff4eca 100644
--- a/lib/mapObjects/CQuest.cpp
+++ b/lib/mapObjects/CQuest.cpp
@@ -938,7 +938,7 @@ void CGSeerHut::serializeJsonOptions(JsonSerializeFormat & handler)
 		case MANA_POINTS:
 		case MORALE_BONUS:
 		case LUCK_BONUS:
-			identifier = "";
+			identifier.clear();
 			break;
 		case RESOURCES:
 			identifier = GameConstants::RESOURCE_NAMES[rID];
@@ -976,7 +976,7 @@ void CGSeerHut::serializeJsonOptions(JsonSerializeFormat & handler)
 
 		const JsonNode & rewardsJson = handler.getCurrent();
 
-		fullIdentifier = "";
+		fullIdentifier.clear();
 
 		if(rewardsJson.Struct().empty())
 			return;
diff --git a/lib/mapObjects/MiscObjects.cpp b/lib/mapObjects/MiscObjects.cpp
index bb51fadb7..bedd9b7c1 100644
--- a/lib/mapObjects/MiscObjects.cpp
+++ b/lib/mapObjects/MiscObjects.cpp
@@ -1802,7 +1802,7 @@ void CGScholar::serializeJsonOptions(JsonSerializeFormat & handler)
 		//TODO: unify
 		const JsonNode & json = handler.getCurrent();
 		bonusType = RANDOM;
-		if(json["rewardPrimSkill"].String() != "")
+		if(!json["rewardPrimSkill"].String().empty())
 		{
 			auto raw = VLC->modh->identifiers.getIdentifier("core", "primSkill", json["rewardPrimSkill"].String());
 			if(raw)
@@ -1811,7 +1811,7 @@ void CGScholar::serializeJsonOptions(JsonSerializeFormat & handler)
 				bonusID = raw.get();
 			}
 		}
-		else if(json["rewardSkill"].String() != "")
+		else if(!json["rewardSkill"].String().empty())
 		{
 			auto raw = VLC->modh->identifiers.getIdentifier("core", "skill", json["rewardSkill"].String());
 			if(raw)
@@ -1820,7 +1820,7 @@ void CGScholar::serializeJsonOptions(JsonSerializeFormat & handler)
 				bonusID = raw.get();
 			}
 		}
-		else if(json["rewardSpell"].String() != "")
+		else if(!json["rewardSpell"].String().empty())
 		{
 			auto raw = VLC->modh->identifiers.getIdentifier("core", "spell", json["rewardSpell"].String());
 			if(raw)
diff --git a/lib/mapping/CMap.cpp b/lib/mapping/CMap.cpp
index b2583721b..d5f3fee82 100644
--- a/lib/mapping/CMap.cpp
+++ b/lib/mapping/CMap.cpp
@@ -203,7 +203,7 @@ void CMapHeader::setupEvents()
 	standardVictory.effect.type = EventEffect::VICTORY;
 	standardVictory.effect.toOtherMessage = VLC->generaltexth->allTexts[5];
 	standardVictory.identifier = "standardVictory";
-	standardVictory.description = ""; // TODO: display in quest window
+	standardVictory.description.clear(); // TODO: display in quest window
 	standardVictory.onFulfill = VLC->generaltexth->allTexts[659];
 	standardVictory.trigger = EventExpression(victoryCondition);
 
@@ -212,7 +212,7 @@ void CMapHeader::setupEvents()
 	standardDefeat.effect.type = EventEffect::DEFEAT;
 	standardDefeat.effect.toOtherMessage = VLC->generaltexth->allTexts[8];
 	standardDefeat.identifier = "standardDefeat";
-	standardDefeat.description = ""; // TODO: display in quest window
+	standardDefeat.description.clear(); // TODO: display in quest window
 	standardDefeat.onFulfill = VLC->generaltexth->allTexts[7];
 	standardDefeat.trigger = EventExpression(defeatCondition);
 
@@ -651,7 +651,7 @@ void CMap::addNewObject(CGObjectInstance * obj)
 	if(obj->id != ObjectInstanceID((si32)objects.size()))
 		throw std::runtime_error("Invalid object instance id");
 
-	if(obj->instanceName == "")
+	if(obj->instanceName.empty())
 		throw std::runtime_error("Object instance name missing");
 
 	if (vstd::contains(instanceNames, obj->instanceName))
diff --git a/lib/mapping/MapFormatH3M.cpp b/lib/mapping/MapFormatH3M.cpp
index 59e8d845d..5ca1087d6 100644
--- a/lib/mapping/MapFormatH3M.cpp
+++ b/lib/mapping/MapFormatH3M.cpp
@@ -313,7 +313,7 @@ void CMapLoaderH3M::readVictoryLossConditions()
 	standardVictory.effect.type = EventEffect::VICTORY;
 	standardVictory.effect.toOtherMessage = VLC->generaltexth->allTexts[5];
 	standardVictory.identifier = "standardVictory";
-	standardVictory.description = ""; // TODO: display in quest window
+	standardVictory.description.clear(); // TODO: display in quest window
 	standardVictory.onFulfill = VLC->generaltexth->allTexts[659];
 	standardVictory.trigger = EventExpression(victoryCondition);
 
@@ -321,7 +321,7 @@ void CMapLoaderH3M::readVictoryLossConditions()
 	standardDefeat.effect.type = EventEffect::DEFEAT;
 	standardDefeat.effect.toOtherMessage = VLC->generaltexth->allTexts[8];
 	standardDefeat.identifier = "standardDefeat";
-	standardDefeat.description = ""; // TODO: display in quest window
+	standardDefeat.description.clear(); // TODO: display in quest window
 	standardDefeat.onFulfill = VLC->generaltexth->allTexts[7];
 	standardDefeat.trigger = EventExpression(defeatCondition);
 
@@ -338,7 +338,7 @@ void CMapLoaderH3M::readVictoryLossConditions()
 		TriggeredEvent specialVictory;
 		specialVictory.effect.type = EventEffect::VICTORY;
 		specialVictory.identifier = "specialVictory";
-		specialVictory.description = ""; // TODO: display in quest window
+		specialVictory.description.clear(); // TODO: display in quest window
 
 		mapHeader->victoryIconIndex = ui16(vicCondition);
 		mapHeader->victoryMessage = VLC->generaltexth->victoryConditions[size_t(vicCondition) + 1];
@@ -526,7 +526,7 @@ void CMapLoaderH3M::readVictoryLossConditions()
 		specialDefeat.effect.type = EventEffect::DEFEAT;
 		specialDefeat.effect.toOtherMessage = VLC->generaltexth->allTexts[5];
 		specialDefeat.identifier = "specialDefeat";
-		specialDefeat.description = ""; // TODO: display in quest window
+		specialDefeat.description.clear(); // TODO: display in quest window
 
 		mapHeader->defeatIconIndex = ui16(lossCond);
 		mapHeader->defeatMessage = VLC->generaltexth->lossCondtions[size_t(lossCond) + 1];
diff --git a/lib/mapping/MapFormatJson.cpp b/lib/mapping/MapFormatJson.cpp
index e1efb5b2c..4e26cdfe9 100644
--- a/lib/mapping/MapFormatJson.cpp
+++ b/lib/mapping/MapFormatJson.cpp
@@ -134,7 +134,7 @@ namespace TriggeredEventsDetail
 
 	static EMetaclass decodeMetaclass(const std::string & source)
 	{
-		if(source == "")
+		if(source.empty())
 			return EMetaclass::INVALID;
 		auto rawId = vstd::find_pos(NMetaclass::names, source);
 
@@ -286,7 +286,7 @@ namespace TriggeredEventsDetail
 				if(event.value > 0)
 					data["value"].Integer() = event.value;
 
-				if(event.objectInstanceName != "")
+				if(!event.objectInstanceName.empty())
 					data["object"].String() = event.objectInstanceName;
 			}
 			break;
diff --git a/lib/serializer/JsonDeserializer.cpp b/lib/serializer/JsonDeserializer.cpp
index 85cb80797..a5378dada 100644
--- a/lib/serializer/JsonDeserializer.cpp
+++ b/lib/serializer/JsonDeserializer.cpp
@@ -38,7 +38,7 @@ void JsonDeserializer::serializeInternal(const std::string & fieldName, si32 & v
 
 	value = defaultValue ? defaultValue.get() : 0;
 
-	if(identifier != "")
+	if(!identifier.empty())
 	{
 		si32 rawId = decoder(identifier);
 
diff --git a/lib/serializer/JsonSerializer.cpp b/lib/serializer/JsonSerializer.cpp
index d01ca0e4c..69253b986 100644
--- a/lib/serializer/JsonSerializer.cpp
+++ b/lib/serializer/JsonSerializer.cpp
@@ -108,7 +108,7 @@ void JsonSerializer::serializeLIC(const std::string & fieldName, LICSet & value)
 
 void JsonSerializer::serializeString(const std::string & fieldName, std::string & value)
 {
-	if(value != "")
+	if(!value.empty())
 		currentObject->operator[](fieldName).String() = value;
 }
 
diff --git a/mapeditor/objectbrowser.cpp b/mapeditor/objectbrowser.cpp
index 960fde550..416b8abfa 100644
--- a/mapeditor/objectbrowser.cpp
+++ b/mapeditor/objectbrowser.cpp
@@ -51,7 +51,7 @@ bool ObjectBrowser::filterAcceptsRow(int source_row, const QModelIndex & source_
 	auto factory = VLC->objtypeh->getHandlerFor(objId, objSubId);
 	auto templ = factory->getTemplates()[templateId];
 
-	result = result & templ->canBePlacedAt(terrain);
+	result = result && templ->canBePlacedAt(terrain);
 
 	//if we are here, just text filter will be applied
 	return result;