Simplify statements

-Simplify return statements across the code

AI/VCAI/AIUtility.cpp

@@ -205,14 +205,7 @@ bool isSafeToVisit(HeroPtr h, uint64_t dangerStrength)
 
 	if(dangerStrength)
 	{
-		if(heroStrength / SAFE_ATTACK_CONSTANT > dangerStrength)
-		{
-			return true;
-		}
-		else
-		{
-			return false;
-		}
+		return heroStrength / SAFE_ATTACK_CONSTANT > dangerStrength;
 	}
 
 	return true; //there's no danger
@@ -314,8 +307,6 @@ bool compareArtifacts(const CArtifactInstance * a1, const CArtifactInstance * a2
 
 	if(art1->price == art2->price)
 		return art1->valOfBonuses(Bonus::PRIMARY_SKILL) > art2->valOfBonuses(Bonus::PRIMARY_SKILL);
-	else if(art1->price > art2->price)
-		return true;
 	else
-		return false;
+		return art1->price > art2->price;
 }

AI/VCAI/BuildingManager.cpp

@@ -225,10 +225,7 @@ bool BuildingManager::getBuildingOptions(const CGTownInstance * t)
 		if (buildingInfo.first > 43)
 			extraBuildings.push_back(buildingInfo.first);
 	}
-	if (tryBuildAnyStructure(t, extraBuildings))
-		return true;
-
-	return false;
+	return tryBuildAnyStructure(t, extraBuildings);
 }
 
 BuildingID BuildingManager::getMaxPossibleGoldBuilding(const CGTownInstance * t)

AI/VCAI/VCAI.cpp

@@ -1282,10 +1282,7 @@ bool VCAI::isGoodForVisit(const CGObjectInstance * obj, HeroPtr h, const AIPath
 	const CGObjectInstance * topObj = cb->getVisitableObjs(obj->visitablePos()).back(); //it may be hero visiting this obj
 																						//we don't try visiting object on which allied or owned hero stands
 																						// -> it will just trigger exchange windows and AI will be confused that obj behind doesn't get visited
-	if (topObj->ID == Obj::HERO && cb->getPlayerRelations(h->tempOwner, topObj->tempOwner) != PlayerRelations::ENEMIES)
-		return false;
-	else
-		return true; //all of the following is met
+	return !(topObj->ID == Obj::HERO && cb->getPlayerRelations(h->tempOwner, topObj->tempOwner) != PlayerRelations::ENEMIES); //all of the following is met
 }
 
 bool VCAI::isTileNotReserved(const CGHeroInstance * h, int3 t) const

lib/CStack.cpp

@@ -308,14 +308,7 @@ bool CStack::unitHasAmmoCart(const battle::Unit * unit) const
 	{
 		if(battle->battleMatchOwner(st, unit, true) && st->getCreature()->idNumber == CreatureID::AMMO_CART)
 		{
-			if(st->alive())
-			{
-				return true;
-			}
-			else
-			{
-				return false;
-			}
+			return st->alive();
 		}
 	}
 	//ammo cart works during creature bank battle while not on battlefield

lib/battle/BattleInfo.cpp

@@ -876,10 +876,7 @@ void BattleInfo::setUnitState(uint32_t id, const JsonNode & data, int64_t health
 		auto selector = [](const Bonus * b)
 		{
 			//Special case: DISRUPTING_RAY is absolutely permanent
-			if(b->source == Bonus::SPELL_EFFECT)
-				return b->sid != SpellID::DISRUPTING_RAY;
-			else
-				return false;
+			return b->source == Bonus::SPELL_EFFECT && b->sid != SpellID::DISRUPTING_RAY;
 		};
 		changedStack->removeBonusesRecursive(selector);
 	}

lib/battle/CBattleInfoCallback.cpp

@@ -577,11 +577,8 @@ bool CBattleInfoCallback::battleCanAttack(const CStack * stack, const CStack * t
 	auto &id = stack->getCreature()->idNumber;
 	if (id == CreatureID::FIRST_AID_TENT || id == CreatureID::CATAPULT)
 		return false;
-
-	if (!target->alive())
-		return false;
-
-	return true;
+	
+	return target->alive();
 }
 
 bool CBattleInfoCallback::battleCanShoot(const battle::Unit * attacker, BattleHex dest) const
@@ -610,12 +607,11 @@ bool CBattleInfoCallback::battleCanShoot(const battle::Unit * attacker, BattleHe
 	if(attacker->creatureIndex() == CreatureID::CATAPULT && defender) //catapult cannot attack creatures
 		return false;
 
-	if(attacker->canShoot()
+	return attacker->canShoot()
 		&& battleMatchOwner(attacker, defender)
 		&& defender->alive()
-		&& (!battleIsUnitBlocked(attacker) || attacker->hasBonusOfType(Bonus::FREE_SHOOTING)))
-		return true;
-	return false;
+		&& (!battleIsUnitBlocked(attacker)
+		|| attacker->hasBonusOfType(Bonus::FREE_SHOOTING));
 }
 
 TDmgRange CBattleInfoCallback::calculateDmgRange(const BattleAttackInfo & info) const

lib/battle/CBattleInfoEssentials.cpp

@@ -422,8 +422,5 @@ bool CBattleInfoEssentials::battleMatchOwner(const PlayerColor & attacker, const
 
 	PlayerColor initialOwner = getBattle()->getSidePlayer(defender->unitSide());
 
-	if(boost::logic::indeterminate(positivness))
-		return true;
-	else
-		return (attacker == initialOwner) == (bool)positivness;
+	return boost::logic::indeterminate(positivness) || (attacker == initialOwner) == (bool)positivness;
 }

lib/battle/CUnitState.cpp

@@ -721,10 +721,7 @@ bool CUnitState::canMove(int turn) const
 
 bool CUnitState::defended(int turn) const
 {
-	if(!turn)
-		return defending;
-	else
-		return false;
+	return !turn && defending;
 }
 
 bool CUnitState::moved(int turn) const

lib/filesystem/CCompressedStream.cpp

@@ -165,7 +165,7 @@ si64 CCompressedStream::readMore(ui8 *data, si64 size)
 				throw std::runtime_error(std::string("Decompression error: ") + inflateState->msg);
 		}
 	}
-	while (endLoop == false && inflateState->avail_out != 0 );
+	while (!endLoop && inflateState->avail_out != 0 );
 
 	decompressed = inflateState->total_out - decompressed;
 

lib/mapObjects/CGTownInstance.cpp

@@ -859,9 +859,7 @@ bool CGTownInstance::passableFor(PlayerColor color) const
 	if ( tempOwner == PlayerColor::NEUTRAL )//neutral guarded - no one can visit
 		return false;
 
-	if (cb->getPlayerRelations(tempOwner, color) != PlayerRelations::ENEMIES)
-		return true;
-	return false;
+	return cb->getPlayerRelations(tempOwner, color) != PlayerRelations::ENEMIES;
 }
 
 void CGTownInstance::getOutOffsets( std::vector<int3> &offsets ) const

lib/mapObjects/CommonConstructors.cpp

@@ -65,9 +65,7 @@ bool CTownInstanceConstructor::objectFilter(const CGObjectInstance * object, con
 		return town->hasBuilt(id);
 	};
 
-	if (filters.count(templ.stringID))
-		return filters.at(templ.stringID).test(buildTest);
-	return false;
+	return filters.count(templ.stringID) != 0 && filters.at(templ.stringID).test(buildTest);
 }
 
 CGObjectInstance * CTownInstanceConstructor::create(const ObjectTemplate & tmpl) const

lib/mapObjects/MiscObjects.cpp

@@ -1279,12 +1279,8 @@ void CGWhirlpool::teleportDialogAnswered(const CGHeroInstance *hero, ui32 answer
 
 bool CGWhirlpool::isProtected(const CGHeroInstance * h)
 {
-	if(h->hasBonusOfType(Bonus::WHIRLPOOL_PROTECTION) ||
-		(h->stacksCount() == 1 && h->Slots().begin()->second->count == 1)) //we can't remove last unit
-	{
-		return true;
-	}
-	return false;
+	return h->hasBonusOfType(Bonus::WHIRLPOOL_PROTECTION)
+	|| (h->stacksCount() == 1 && h->Slots().begin()->second->count == 1);
 }
 
 void CGArtifact::initObj(CRandomGenerator & rand)

lib/mapObjects/ObjectTemplate.cpp

@@ -44,9 +44,7 @@ static bool isOnVisitableFromTopList(int identifier, int type)
 		Obj::QUEST_GUARD,
 		Obj::CORPSE
 	};
-	if (vstd::find_pos(visitableFromTop, identifier) != -1)
-		return true;
-	return false;
+	return vstd::find_pos(visitableFromTop, identifier) != -1;
 }
 
 ObjectTemplate::ObjectTemplate():
@@ -430,30 +428,22 @@ bool ObjectTemplate::isWithin(si32 X, si32 Y) const
 {
 	if (X < 0 || Y < 0)
 		return false;
-	if (X >= getWidth() || Y >= getHeight())
-		return false;
-	return true;
+	return !(X >= getWidth() || Y >= getHeight());
 }
 
 bool ObjectTemplate::isVisitableAt(si32 X, si32 Y) const
 {
-	if (isWithin(X, Y))
-		return usedTiles[Y][X] & VISITABLE;
-	return false;
+	return isWithin(X, Y) && usedTiles[Y][X] & VISITABLE;
 }
 
 bool ObjectTemplate::isVisibleAt(si32 X, si32 Y) const
 {
-	if (isWithin(X, Y))
-		return usedTiles[Y][X] & VISIBLE;
-	return false;
+	return isWithin(X, Y) && usedTiles[Y][X] & VISIBLE;
 }
 
 bool ObjectTemplate::isBlockedAt(si32 X, si32 Y) const
 {
-	if (isWithin(X, Y))
-		return usedTiles[Y][X] & BLOCKED;
-	return false;
+	return isWithin(X, Y) && usedTiles[Y][X] & BLOCKED;
 }
 
 std::set<int3> ObjectTemplate::getBlockedOffsets() const

lib/mapping/CDrawRoadsOperation.cpp

@@ -309,16 +309,7 @@ CDrawRoadsOperation::ValidationResult CDrawRoadsOperation::validateTile(const Ro
 
 			int3 currentPos(cx, cy, pos.z);
 
-			bool hasSomething;
-
-			if(!map->isInTheMap(currentPos))
-			{
-				hasSomething = true; //road/river can go out of map
-			}
-			else
-			{
-				hasSomething = tileHasSomething(currentPos);
-			}
+			bool hasSomething = !map->isInTheMap(currentPos) || tileHasSomething(currentPos);
 
 			if(ruleIsSomething(flipped.data[i]))
 			{

lib/rmg/CMapGenerator.cpp

@@ -617,10 +617,7 @@ void CMapGenerator::createConnections2()
 				boost::set_intersection(tilesA, tilesB, std::back_inserter(commonTiles), [](const int3 &lhs, const int3 &rhs) -> bool
 				{
 					//ignore z coordinate
-					if (lhs.x < rhs.x)
-						return true;
-					else
-						return lhs.y < rhs.y;
+					return lhs.x < rhs.x || lhs.y < rhs.y;
 				});
 
 				vstd::erase_if(commonTiles, [](const int3 &tile) -> bool

lib/spells/CSpellHandler.cpp

@@ -594,10 +594,7 @@ CSpell::TargetInfo::TargetInfo(const CSpell * spell, const int level, spells::Mo
 bool DLL_LINKAGE isInScreenRange(const int3 & center, const int3 & pos)
 {
 	int3 diff = pos - center;
-	if(diff.x >= -9  &&  diff.x <= 9  &&  diff.y >= -8  &&  diff.y <= 8)
-		return true;
-	else
-		return false;
+	return diff.x >= -9 && diff.x <= 9 && diff.y >= -8 && diff.y <= 8;
 }
 
 ///CSpellHandler

lib/spells/TargetCondition.cpp

@@ -57,11 +57,7 @@ public:
 	bool isReceptive(const Mechanics * m, const battle::Unit * target) const override
 	{
 		bool result = check(m, target);
-
-		if(inverted)
-			return !result;
-		else
-			return result;
+		return inverted != result;
 	}
 
 protected:
@@ -120,10 +116,10 @@ protected:
 		cachingStr << "type_" << Bonus::LEVEL_SPELL_IMMUNITY << "addInfo_1";
 
 		TBonusListPtr levelImmunities = target->getBonuses(Selector::type(Bonus::LEVEL_SPELL_IMMUNITY).And(Selector::info(1)), cachingStr.str());
-
-		if(levelImmunities->size() > 0 && levelImmunities->totalValue() >= m->getSpellLevel() && m->getSpellLevel() > 0)
-			return false;
-		return true;
+		
+		return !(levelImmunities->size() > 0
+		&& levelImmunities->totalValue() >= m->getSpellLevel()
+		&& m->getSpellLevel() > 0);
 	}
 };
 
@@ -141,9 +137,7 @@ protected:
 	{
 		std::stringstream cachingStr;
 		cachingStr << "type_" << Bonus::SPELL_IMMUNITY << "subtype_" << m->getSpellIndex() << "addInfo_1";
-		if(target->hasBonus(Selector::typeSubtypeInfo(Bonus::SPELL_IMMUNITY, m->getSpellIndex(), 1), cachingStr.str()))
-			return false;
-		return true;
+		return !target->hasBonus(Selector::typeSubtypeInfo(Bonus::SPELL_IMMUNITY, m->getSpellIndex(), 1), cachingStr.str());
 	}
 };
 
@@ -197,10 +191,9 @@ protected:
 	bool check(const Mechanics * m, const battle::Unit * target) const override
 	{
 		TBonusListPtr levelImmunities = target->getBonuses(Selector::type(Bonus::LEVEL_SPELL_IMMUNITY));
-
-		if(levelImmunities->size() > 0 && levelImmunities->totalValue() >= m->getSpellLevel() && m->getSpellLevel() > 0)
-			return false;
-		return true;
+		return !(levelImmunities->size() > 0 &&
+		levelImmunities->totalValue() >= m->getSpellLevel() &&
+		m->getSpellLevel() > 0);
 	}
 };
 
@@ -236,10 +229,7 @@ protected:
 		int64_t subjectHealth = target->getAvailableHealth();
 		//apply 'damage' bonus for hypnotize, including hero specialty
 		auto maxHealth = m->applySpellBonus(m->getEffectValue(), target);
-		if(subjectHealth > maxHealth)
-			return false;
-
-		return true;
+		return subjectHealth <= maxHealth;
 	}
 };
 
@@ -426,11 +416,7 @@ bool TargetCondition::isReceptive(const Mechanics * m, const battle::Unit * targ
 		if(item->isReceptive(m, target))
 			return true;
 	}
-
-	if(!check(normal, m, target))
-		return false;
-
-	return true;
+	return check(normal, m, target);
 }
 
 void TargetCondition::serializeJson(JsonSerializeFormat & handler, const ItemFactory * itemFactory)
@@ -488,11 +474,7 @@ bool TargetCondition::check(const ItemVector & condition, const Mechanics * m, c
 			nonExclusiveExits = true;
 		}
 	}
-
-	if(nonExclusiveExits)
-		return nonExclusiveCheck;
-	else
-		return true;
+	return !nonExclusiveExits || nonExclusiveCheck;
 }
 
 void TargetCondition::loadConditions(const JsonNode & source, bool exclusive, bool inverted, const ItemFactory * itemFactory)

lib/spells/effects/Catapult.cpp

@@ -59,11 +59,8 @@ bool Catapult::applicable(Problem & problem, const Mechanics * m) const
 	}
 
 	const auto attackableBattleHexes = m->cb->getAttackableBattleHexes();
-
-	if(attackableBattleHexes.empty())
-		return m->adaptProblem(ESpellCastProblem::NO_APPROPRIATE_TARGET, problem);
-
-	return true;
+	
+	return !attackableBattleHexes.empty() || m->adaptProblem(ESpellCastProblem::NO_APPROPRIATE_TARGET, problem);
 }
 
 void Catapult::apply(BattleStateProxy * battleState, RNG & rng, const Mechanics * m, const EffectTarget & /* eTarget */) const

lib/spells/effects/Dispel.cpp

@@ -102,9 +102,7 @@ bool Dispel::mainSelector(const Bonus * bonus)
 		if(sourceSpell->id == SpellID::CLONE)
 			return false;
 		//stack may have inherited effects
-		if(sourceSpell->isAdventureSpell())
-			return false;
-		return true;
+		return !sourceSpell->isAdventureSpell();
 	}
 	//not spell effect
 	return false;

lib/spells/effects/Sacrifice.cpp

@@ -110,11 +110,8 @@ bool Sacrifice::applicable(Problem & problem, const Mechanics * m, const EffectT
 		auto victim = target.at(1).unitValue;
 		if(!victim)
 			return false;
-
-		if(!victim->alive() || !getStackFilter(m, false, victim) || !isReceptive(m, victim))
-			return false;
-
-		return true;
+		
+		return !(!victim->alive() || !getStackFilter(m, false, victim) || !isReceptive(m, victim));
 	}
 
 	return true;

lib/spells/effects/UnitEffect.cpp

@@ -93,13 +93,7 @@ EffectTarget UnitEffect::filterTarget(const Mechanics * m, const EffectTarget &
 	EffectTarget res;
 	vstd::copy_if(target, std::back_inserter(res), [this, m](const Destination & d)
 	{
-		if(!d.unitValue)
-			return false;
-		if(!isValidTarget(m, d.unitValue))
-			return false;
-		if(!isReceptive(m, d.unitValue))
-			return false;
-		return true;
+		return d.unitValue && isValidTarget(m, d.unitValue) && isReceptive(m, d.unitValue);
 	});
 	return res;
 }
@@ -271,10 +265,7 @@ bool UnitEffect::isReceptive(const Mechanics * m, const battle::Unit * unit) con
 		//SPELL_IMMUNITY absolute case
 		std::stringstream cachingStr;
 		cachingStr << "type_" << Bonus::SPELL_IMMUNITY << "subtype_" << m->getSpellIndex() << "addInfo_1";
-		if(unit->hasBonus(Selector::typeSubtypeInfo(Bonus::SPELL_IMMUNITY, m->getSpellIndex(), 1), cachingStr.str()))
-			return false;
-
-		return true;
+		return !unit->hasBonus(Selector::typeSubtypeInfo(Bonus::SPELL_IMMUNITY, m->getSpellIndex(), 1), cachingStr.str());
 	}
 	else
 	{