Core/Misc: Use boost::in_place() to initialize optionals.

* Improves commit 800d5d8939
* Thanks @Shauren for this great suggestion.

src/server/game/Battlegrounds/Battleground.cpp

@@ -1325,7 +1325,7 @@ void Battleground::BuildPvPLogDataPacket(WorldPackets::Battleground::PVPLogData&
         playerData.Faction = score.second->TeamId;
         if (score.second->HonorableKills || score.second->Deaths || score.second->BonusHonor)
         {
-            playerData.Honor = WorldPackets::Battleground::PVPLogData::HonorData();
+            playerData.Honor = boost::in_place();
             playerData.Honor->HonorKills = score.second->HonorableKills;
             playerData.Honor->Deaths = score.second->Deaths;
             playerData.Honor->ContributionPoints = score.second->BonusHonor;
@@ -1354,7 +1354,7 @@ void Battleground::BuildPvPLogDataPacket(WorldPackets::Battleground::PVPLogData&
 
     if (isRated())
     {
-        pvpLogData.Ratings = WorldPackets::Battleground::PVPLogData::RatingData();
+        pvpLogData.Ratings = boost::in_place();
 
         for (uint8 i = 0; i < BG_TEAMS_COUNT; ++i)
         {

src/server/game/Entities/Player/Player.cpp

@@ -2155,7 +2155,7 @@ bool Player::TeleportTo(uint32 mapid, float x, float y, float z, float orientati
                 transferPending.MapID = mapid;
                 if (Transport* transport = GetTransport())
                 {
-                    transferPending.Ship = WorldPackets::Movement::TransferPending::ShipTransferPending();
+                    transferPending.Ship = boost::in_place();
                     transferPending.Ship->ID = transport->GetEntry();
                     transferPending.Ship->OriginMapID = GetMapId();
                 }

src/server/game/Guilds/Guild.cpp

@@ -1313,7 +1313,7 @@ void Guild::SendQueryResponse(WorldSession* session)
 {
     WorldPackets::Guild::QueryGuildInfoResponse response;
     response.GuildGuid = GetGUID();
-    response.Info = WorldPackets::Guild::QueryGuildInfoResponse::GuildInfo();
+    response.Info = boost::in_place();
 
     response.Info->GuildGUID = GetGUID();
     response.Info->VirtualRealmAddress = GetVirtualRealmAddress();

src/server/game/Handlers/AuthHandler.cpp

@@ -28,13 +28,13 @@ void WorldSession::SendAuthResponse(uint8 code, bool queued, uint32 queuePos)
 
     if (queued)
     {
-        response.WaitInfo = WorldPackets::Auth::AuthResponse::AuthWaitInfo();
+        response.WaitInfo = boost::in_place();
         response.WaitInfo->WaitCount = queuePos;
     }
 
     if (code == AUTH_OK)
     {
-        response.SuccessInfo = WorldPackets::Auth::AuthResponse::AuthSuccessInfo();
+        response.SuccessInfo = boost::in_place();
 
         response.SuccessInfo->AccountExpansionLevel = GetExpansion();
         response.SuccessInfo->ActiveExpansionLevel = GetExpansion();
@@ -64,7 +64,7 @@ void WorldSession::SendAuthWaitQue(uint32 position)
         response.Result = AUTH_OK;
     else
     {
-        response.WaitInfo = WorldPackets::Auth::AuthResponse::AuthWaitInfo();
+        response.WaitInfo = boost::in_place();
         response.WaitInfo->WaitCount = position;
         response.Result = AUTH_WAIT_QUEUE;
     }

src/server/game/Handlers/CharacterHandler.cpp

@@ -1135,7 +1135,7 @@ void WorldSession::SendFeatureSystemStatus()
     features.VoiceEnabled = false;
     features.BrowserEnabled = false; // Has to be false, otherwise client will crash if "Customer Support" is opened
 
-    features.EuropaTicketSystemStatus = WorldPackets::System::FeatureSystemStatus::EuropaTicketConfig();
+    features.EuropaTicketSystemStatus = boost::in_place();
     features.EuropaTicketSystemStatus->ThrottleState.MaxTries = 10;
     features.EuropaTicketSystemStatus->ThrottleState.PerMilliseconds = 60000;
     features.EuropaTicketSystemStatus->ThrottleState.TryCount = 1;
@@ -2583,7 +2583,7 @@ void WorldSession::SendCharFactionChange(ResponseCodes result, WorldPackets::Cha
 
     if (result == RESPONSE_SUCCESS)
     {
-        packet.Display = WorldPackets::Character::CharFactionChangeResult::CharFactionChangeDisplayInfo();
+        packet.Display = boost::in_place();
         packet.Display->Name = factionChangeInfo->Name;
         packet.Display->SexID = factionChangeInfo->SexID;
         packet.Display->SkinID = *factionChangeInfo->SkinID;

src/server/game/Handlers/InspectHandler.cpp

@@ -65,7 +65,7 @@ void WorldSession::HandleInspectOpcode(WorldPackets::Inspect::Inspect& inspect)
 
     if (Guild* guild = sGuildMgr->GetGuildById(player->GetGuildId()))
     {
-        inspectResult.GuildData = WorldPackets::Inspect::InspectGuildData();
+        inspectResult.GuildData = boost::in_place();
         inspectResult.GuildData->GuildGUID = guild->GetGUID();
         inspectResult.GuildData->NumGuildMembers = guild->GetMembersCount();
         inspectResult.GuildData->AchievementPoints = guild->GetAchievementMgr().GetAchievementPoints();

src/server/game/Handlers/TradeHandler.cpp

@@ -69,7 +69,7 @@ void WorldSession::SendUpdateTrade(bool trader_data /*= true*/)
             tradeItem.GiftCreator = item->GetGuidValue(ITEM_FIELD_GIFTCREATOR);
             if (!item->HasFlag(ITEM_FIELD_FLAGS, ITEM_FLAG_WRAPPED))
             {
-                tradeItem.Unwrapped = WorldPackets::Trade::TradeUpdated::UnwrappedTradeItem();
+                tradeItem.Unwrapped = boost::in_place();
 
                 tradeItem.Unwrapped->Item.Initialize(item);
                 tradeItem.Unwrapped->EnchantID = item->GetEnchantmentId(PERM_ENCHANTMENT_SLOT);

src/server/game/Server/Packets/ItemPackets.cpp

@@ -104,7 +104,7 @@ ByteBuffer& operator>>(ByteBuffer& data, Optional<WorldPackets::Item::ItemBonusI
 {
     uint32 bonusListIdSize;
 
-    itemBonusInstanceData = WorldPackets::Item::ItemBonusInstanceData();
+    itemBonusInstanceData = boost::in_place();
 
     data >> itemBonusInstanceData->Context;
     data >> bonusListIdSize;
@@ -180,7 +180,7 @@ void WorldPackets::Item::ItemInstance::Initialize(::Item const* item)
     std::vector<uint32> const& bonusListIds = item->GetDynamicValues(ITEM_DYNAMIC_FIELD_BONUSLIST_IDS);
     if (!bonusListIds.empty())
     {
-        ItemBonus = WorldPackets::Item::ItemBonusInstanceData();
+        ItemBonus = boost::in_place();
         ItemBonus->BonusListIDs.insert(ItemBonus->BonusListIDs.end(), bonusListIds.begin(), bonusListIds.end());
         ItemBonus->Context = item->GetUInt32Value(ITEM_FIELD_CONTEXT);
     }
@@ -203,7 +203,7 @@ void WorldPackets::Item::ItemInstance::Initialize(::LootItem const& lootItem)
     RandomPropertiesID   = lootItem.randomPropertyId;
     if (!lootItem.BonusListIDs.empty())
     {
-        ItemBonus = ItemBonusInstanceData();
+        ItemBonus = boost::in_place();
         ItemBonus->BonusListIDs = lootItem.BonusListIDs;
         ItemBonus->Context = 0; /// @todo
     }

src/server/game/Server/Packets/MovementPackets.h

@@ -175,13 +175,13 @@ namespace WorldPackets
 
         class TransferPending final : public ServerPacket
         {
-        public:
             struct ShipTransferPending
             {
                 uint32 ID = 0;              ///< gameobject_template.entry of the transport the player is teleporting on
                 int32 OriginMapID = -1;     ///< Map id the player is currently on (before teleport)
             };
 
+        public:
             TransferPending() : ServerPacket(SMSG_TRANSFER_PENDING, 16) { }
 
             WorldPacket const* Write() override;

src/server/game/Server/Packets/SpellPackets.cpp

@@ -143,7 +143,7 @@ WorldPacket const* WorldPackets::Spells::AuraUpdate::Write()
 
 ByteBuffer& operator>>(ByteBuffer& buffer, Optional<WorldPackets::Spells::TargetLocation>& location)
 {
-    location = WorldPackets::Spells::TargetLocation();
+    location = boost::in_place();
     buffer >> location->Transport;
     buffer >> location->Location.m_positionX;
     buffer >> location->Location.m_positionY;

src/server/game/Server/Packets/TicketPackets.cpp

@@ -236,7 +236,7 @@ ByteBuffer& operator>>(ByteBuffer& data, WorldPackets::Ticket::SupportTicketSubm
 
 ByteBuffer& operator>>(ByteBuffer& data, Optional<WorldPackets::Ticket::SupportTicketSubmitComplaint::SupportTicketMailInfo>& mail)
 {
-    mail = WorldPackets::Ticket::SupportTicketSubmitComplaint::SupportTicketMailInfo();
+    mail = boost::in_place();
 
     data >> mail->MailID;
     uint16 bodyLength = data.ReadBits(13);
@@ -250,7 +250,7 @@ ByteBuffer& operator>>(ByteBuffer& data, Optional<WorldPackets::Ticket::SupportT
 
 ByteBuffer& operator>>(ByteBuffer& data, Optional<WorldPackets::Ticket::SupportTicketSubmitComplaint::SupportTicketCalendarEventInfo>& event)
 {
-    event = WorldPackets::Ticket::SupportTicketSubmitComplaint::SupportTicketCalendarEventInfo();
+    event = boost::in_place();
     data >> event->EventID;
     data >> event->InviteID;
     uint8 titleLength = data.ReadBits(8);
@@ -262,7 +262,7 @@ ByteBuffer& operator>>(ByteBuffer& data, Optional<WorldPackets::Ticket::SupportT
 
 ByteBuffer& operator>>(ByteBuffer& data, Optional<WorldPackets::Ticket::SupportTicketSubmitComplaint::SupportTicketPetInfo>& pet)
 {
-    pet = WorldPackets::Ticket::SupportTicketSubmitComplaint::SupportTicketPetInfo();
+    pet = boost::in_place();
     data >> pet->PetID;
     uint8 nameLength = data.ReadBits(8);
 
@@ -273,7 +273,7 @@ ByteBuffer& operator>>(ByteBuffer& data, Optional<WorldPackets::Ticket::SupportT
 
 ByteBuffer& operator>>(ByteBuffer& data, Optional<WorldPackets::Ticket::SupportTicketSubmitComplaint::SupportTicketGuildInfo>& guild)
 {
-    guild = WorldPackets::Ticket::SupportTicketSubmitComplaint::SupportTicketGuildInfo();
+    guild = boost::in_place();
     data >> guild->GuildID;
     uint8 nameLength = data.ReadBits(8);
 
@@ -284,7 +284,7 @@ ByteBuffer& operator>>(ByteBuffer& data, Optional<WorldPackets::Ticket::SupportT
 
 ByteBuffer& operator>>(ByteBuffer& data, Optional<WorldPackets::Ticket::SupportTicketSubmitComplaint::Struct5E4383>& str)
 {
-    str = WorldPackets::Ticket::SupportTicketSubmitComplaint::Struct5E4383();
+    str = boost::in_place();
     data >> str->RideTicket;
     data >> str->_40;
     data >> str->_56;

src/server/game/Server/Packets/WhoPackets.cpp

@@ -41,7 +41,7 @@ ByteBuffer& operator>>(ByteBuffer& data, WorldPackets::Who::WhoWord& word)
 
 ByteBuffer& operator>>(ByteBuffer& data, Optional<WorldPackets::Who::WhoRequestServerInfo>& serverInfo)
 {
-    serverInfo = WorldPackets::Who::WhoRequestServerInfo();
+    serverInfo = boost::in_place();
 
     data >> serverInfo->FactionGroup;
     data >> serverInfo->Locale;

src/server/game/Spells/Spell.cpp

@@ -222,7 +222,7 @@ void SpellCastTargets::Write(WorldPackets::Spells::SpellTargetData& data)
 
     if (m_targetMask & TARGET_FLAG_SOURCE_LOCATION)
     {
-        data.SrcLocation = WorldPackets::Spells::TargetLocation();
+        data.SrcLocation = boost::in_place();
         data.SrcLocation->Transport = m_src._transportGUID; // relative position guid here - transport for example
         if (!m_src._transportGUID.IsEmpty())
             data.SrcLocation->Location = m_src._transportOffset;
@@ -232,7 +232,7 @@ void SpellCastTargets::Write(WorldPackets::Spells::SpellTargetData& data)
 
     if (m_targetMask & TARGET_FLAG_DEST_LOCATION)
     {
-        data.DstLocation = WorldPackets::Spells::TargetLocation();
+        data.DstLocation = boost::in_place();
         data.DstLocation->Transport = m_dst._transportGUID; // relative position guid here - transport for example
         if (!m_dst._transportGUID.IsEmpty())
             data.DstLocation->Location = m_dst._transportOffset;
@@ -3888,7 +3888,7 @@ void Spell::SendSpellStart()
 
     if (castFlags & CAST_FLAG_RUNE_LIST) // rune cooldowns list
     {
-        castData.RemainingRunes = WorldPackets::Spells::RuneData();
+        castData.RemainingRunes = boost::in_place();
 
         //TODO: There is a crash caused by a spell with CAST_FLAG_RUNE_LIST casted by a creature
         //The creature is the mover of a player, so HandleCastSpellOpcode uses it as the caster
@@ -4006,7 +4006,7 @@ void Spell::SendSpellGo()
 
     if (castFlags & CAST_FLAG_RUNE_LIST) // rune cooldowns list
     {
-        castData.RemainingRunes = WorldPackets::Spells::RuneData();
+        castData.RemainingRunes = boost::in_place();
 
         //TODO: There is a crash caused by a spell with CAST_FLAG_RUNE_LIST casted by a creature
         //The creature is the mover of a player, so HandleCastSpellOpcode uses it as the caster

src/server/game/Support/SupportMgr.cpp

@@ -1056,7 +1056,7 @@ void SupportMgr::SendGmTicket(WorldSession* session, GmTicket* ticket) const
     if (ticket)
     {
         response.Result = GMTICKET_STATUS_HASTEXT;
-        response.Info = WorldPackets::Ticket::GMTicketGetTicketResponse::GMTicketInfo();
+        response.Info = boost::in_place();
 
         response.Info->TicketID = ticket->GetId();
         response.Info->TicketDescription = ticket->GetDescription();

src/server/shared/Common.h

@@ -40,6 +40,7 @@
 #include <algorithm>
 
 #include <boost/optional.hpp>
+#include <boost/utility/in_place_factory.hpp>
 
 #include "Debugging/Errors.h"