Use boost::optional and boost::none instead of smelly pointer (#24134)

* Remove bad pointer usage from CharacterCache

Use TrinityCore Option type instead which is intended for this purpose. (Wrapper around boost::option until C++17 bump is finalised)

* Unify codestyle regarding TC optional type

Based upon advice from @Shauren

src/server/game/AI/CoreAI/GameObjectAI.h

@@ -52,7 +52,7 @@ class TC_GAME_API GameObjectAI
         static int32 Permissible(GameObject const* go);
 
         // Called when the dialog status between a player and the gameobject is requested.
-        virtual Optional<QuestGiverStatus> GetDialogStatus(Player* /*player*/) { return boost::none; }
+        virtual Optional<QuestGiverStatus> GetDialogStatus(Player* /*player*/) { return {}; }
 
         // Called when a player opens a gossip dialog with the gameobject.
         virtual bool GossipHello(Player* /*player*/) { return false; }

src/server/game/AI/CreatureAI.h

@@ -192,7 +192,7 @@ class TC_GAME_API CreatureAI : public UnitAI
         /// == Gossip system ================================
 
         // Called when the dialog status between a player and the creature is requested.
-        virtual Optional<QuestGiverStatus> GetDialogStatus(Player* /*player*/) { return boost::none; }
+        virtual Optional<QuestGiverStatus> GetDialogStatus(Player* /*player*/) { return {}; }
 
         // Called when a player opens a gossip dialog with the creature.
         virtual bool GossipHello(Player* /*player*/) { return false; }

src/server/game/Cache/CharacterCache.cpp

@@ -116,7 +116,7 @@ void CharacterCache::DeleteCharacterCacheEntry(ObjectGuid const& guid, std::stri
     _characterCacheByNameStore.erase(name);
 }
 
-void CharacterCache::UpdateCharacterData(ObjectGuid const& guid, std::string const& name, uint8* gender /*= nullptr*/, uint8* race /*= nullptr*/)
+void CharacterCache::UpdateCharacterData(ObjectGuid const& guid, std::string const& name, Optional<uint8> gender /*= {}*/, Optional<uint8> race /*= {}*/)
 {
     auto itr = _characterCacheStore.find(guid);
     if (itr == _characterCacheStore.end())

src/server/game/Cache/CharacterCache.h

@@ -20,6 +20,7 @@
 
 #include "Define.h"
 #include "ObjectGuid.h"
+#include "Optional.h"
 #include <string>
 
 struct CharacterCacheEntry
@@ -46,7 +47,7 @@ class TC_GAME_API CharacterCache
         void AddCharacterCacheEntry(ObjectGuid const& guid, uint32 accountId, std::string const& name, uint8 gender, uint8 race, uint8 playerClass, uint8 level);
         void DeleteCharacterCacheEntry(ObjectGuid const& guid, std::string const& name);
 
-        void UpdateCharacterData(ObjectGuid const& guid, std::string const& name, uint8* gender = nullptr, uint8* race = nullptr);
+        void UpdateCharacterData(ObjectGuid const& guid, std::string const& name, Optional<uint8> gender = {}, Optional<uint8> race = {});
         void UpdateCharacterLevel(ObjectGuid const& guid, uint8 level);
         void UpdateCharacterAccountId(ObjectGuid const& guid, uint32 accountId);
         void UpdateCharacterGuildId(ObjectGuid const& guid, ObjectGuid::LowType guildId);

src/server/game/Handlers/CharacterHandler.cpp

@@ -1459,7 +1459,7 @@ void WorldSession::HandleCharCustomizeCallback(std::shared_ptr<CharacterCustomiz
 
     CharacterDatabase.CommitTransaction(trans);
 
-    sCharacterCache->UpdateCharacterData(customizeInfo->Guid, customizeInfo->Name, &customizeInfo->Gender);
+    sCharacterCache->UpdateCharacterData(customizeInfo->Guid, customizeInfo->Name, customizeInfo->Gender);
 
     SendCharCustomize(RESPONSE_SUCCESS, customizeInfo.get());
 
@@ -1758,7 +1758,7 @@ void WorldSession::HandleCharFactionOrRaceChangeCallback(std::shared_ptr<Charact
         trans->Append(stmt);
     }
 
-    sCharacterCache->UpdateCharacterData(factionChangeInfo->Guid, factionChangeInfo->Name, &factionChangeInfo->Gender, &factionChangeInfo->Race);
+    sCharacterCache->UpdateCharacterData(factionChangeInfo->Guid, factionChangeInfo->Name, factionChangeInfo->Gender, factionChangeInfo->Race);
 
     if (oldRace != factionChangeInfo->Race)
     {

src/server/game/Scripting/ScriptReloadMgr.cpp

@@ -275,7 +275,7 @@ Optional<std::shared_ptr<ScriptModule>>
                          path.generic_string().c_str());
         }
 
-        return boost::none;
+        return {};
     }
 
     // Use RAII to release the library on failure.
@@ -302,7 +302,7 @@ Optional<std::shared_ptr<ScriptModule>>
         TC_LOG_ERROR("scripts.hotswap", "Could not extract all required functions from the shared library \"%s\"!",
             path.generic_string().c_str());
 
-        return boost::none;
+        return {};
     }
 }