Avoid array resizing with ranged for loop

Source/vampires/EnemyCharacter.cpp

@@ -189,8 +189,10 @@ void AEnemyCharacter::ResetHealth()
 
 void AEnemyCharacter::DamagePlayer()
 {
-	for (auto DamagedPlayer : Player)
+	if (Player.Num() == 0) return;
+
+	for (int i = 0; i < Player.Num(); i++)
 	{
-		UGameplayStatics::ApplyDamage(DamagedPlayer, Damage, GetController(), this, nullptr);
+		UGameplayStatics::ApplyDamage(Player[i], Damage, GetController(), this, nullptr);
 	}
 }

Source/vampires/ObjectPoolManager.cpp

@@ -70,6 +70,19 @@ void AObjectPoolManager::ReturnObject(AActor* Object)
 	}
 }
 
+void AObjectPoolManager::ReturnAllObjects()
+{
+	int ObjectPoolSize = ObjectPool.Num();
+
+	for (int i = 0; i < ObjectPoolSize; i++)
+	{
+		if (!ObjectPool[i]->IsHidden())
+		{
+			ReturnObject(ObjectPool[i]);			
+		}
+	}
+}
+
 void AObjectPoolManager::SetObjectStatus(bool bEnabled, AActor* Object)
 {
 	Object->SetActorHiddenInGame(!bEnabled);

Source/vampires/ObjectPoolManager.h

@@ -22,6 +22,8 @@ public:
 
 	void ReturnObject(AActor* Object);
 
+	void ReturnAllObjects();
+
 protected:
 	// Called when the game starts or when spawned
 	virtual void BeginPlay() override;

Source/vampires/VampireGameMode.cpp

@@ -159,6 +159,21 @@ void AVampireGameMode::AddRandomEnemyTypeToPool()
 void AVampireGameMode::OnPlayerDeath(FDamageInfo DamageInfo)
 {
 	GetWorldTimerManager().ClearTimer(SpawnEnemyTimerDelegate);
+
+	if (EnemyObjectPoolManager)
+	{
+		EnemyObjectPoolManager->ReturnAllObjects();
+	}
+
+	if (ProjectileObjectPoolManager)
+	{
+		ProjectileObjectPoolManager->ReturnAllObjects();
+	}
+
+	if (PickupObjectPoolManager)
+	{
+		PickupObjectPoolManager->ReturnAllObjects();
+	}
 }
 
 void AVampireGameMode::EndGame()