Core/Game: Move singleton instances into compilation units

* Fixes issues when building shared libraries
  (prevents gcc and clang from providing several instance)

(cherry picked from commit 329225b40d110bed634f8cd0a1ab5c6dc7bbbdd1)

66 files changed, 251 insertions, 175 deletions

diff --git a/src/server/game/AI/SmartScripts/SmartScriptMgr.cpp b/src/server/game/AI/SmartScripts/SmartScriptMgr.cpp
index 3fe6fcdb4ae..ba1738a523b 100644
--- a/src/server/game/AI/SmartScripts/SmartScriptMgr.cpp
+++ b/src/server/game/AI/SmartScripts/SmartScriptMgr.cpp
@@ -27,6 +27,12 @@
 
 #include "SmartScriptMgr.h"
 
+SmartWaypointMgr* SmartWaypointMgr::instance()
+{
+    static SmartWaypointMgr instance;
+    return &instance;
+}
+
 void SmartWaypointMgr::LoadFromDB()
 {
     uint32 oldMSTime = getMSTime();
@@ -98,6 +104,12 @@ SmartWaypointMgr::~SmartWaypointMgr()
     }
 }
 
+SmartAIMgr* SmartAIMgr::instance()
+{
+    static SmartAIMgr instance;
+    return &instance;
+}
+
 void SmartAIMgr::LoadSmartAIFromDB()
 {
     LoadHelperStores();
diff --git a/src/server/game/AI/SmartScripts/SmartScriptMgr.h b/src/server/game/AI/SmartScripts/SmartScriptMgr.h
index d60834c9fef..748792b9b42 100644
--- a/src/server/game/AI/SmartScripts/SmartScriptMgr.h
+++ b/src/server/game/AI/SmartScripts/SmartScriptMgr.h
@@ -1447,11 +1447,7 @@ class SmartWaypointMgr
         ~SmartWaypointMgr();
 
     public:
-        static SmartWaypointMgr* instance()
-        {
-            static SmartWaypointMgr instance;
-            return &instance;
-        }
+        static SmartWaypointMgr* instance();
 
         void LoadFromDB();
 
@@ -1483,11 +1479,7 @@ class SmartAIMgr
         ~SmartAIMgr() { }
 
     public:
-        static SmartAIMgr* instance()
-        {
-            static SmartAIMgr instance;
-            return &instance;
-        }
+        static SmartAIMgr* instance();
 
         void LoadSmartAIFromDB();
 
diff --git a/src/server/game/Accounts/AccountMgr.cpp b/src/server/game/Accounts/AccountMgr.cpp
index a0bd6a08b2c..e21958fd14f 100644
--- a/src/server/game/Accounts/AccountMgr.cpp
+++ b/src/server/game/Accounts/AccountMgr.cpp
@@ -33,6 +33,12 @@ AccountMgr::~AccountMgr()
     ClearRBAC();
 }
 
+AccountMgr* AccountMgr::instance()
+{
+    static AccountMgr instance;
+    return &instance;
+}
+
 AccountOpResult AccountMgr::CreateAccount(std::string username, std::string password, std::string email = "")
 {
     if (utf8length(username) > MAX_ACCOUNT_STR)
diff --git a/src/server/game/Accounts/AccountMgr.h b/src/server/game/Accounts/AccountMgr.h
index 40ccba1f8e5..0a82c3fe745 100644
--- a/src/server/game/Accounts/AccountMgr.h
+++ b/src/server/game/Accounts/AccountMgr.h
@@ -55,11 +55,7 @@ class AccountMgr
         ~AccountMgr();
 
     public:
-        static AccountMgr* instance()
-        {
-            static AccountMgr instance;
-            return &instance;
-        }
+        static AccountMgr* instance();
 
         AccountOpResult CreateAccount(std::string username, std::string password, std::string email);
         static AccountOpResult DeleteAccount(uint32 accountId);
diff --git a/src/server/game/Achievements/AchievementMgr.cpp b/src/server/game/Achievements/AchievementMgr.cpp
index 40cb643bbb5..ebc814405bf 100644
--- a/src/server/game/Achievements/AchievementMgr.cpp
+++ b/src/server/game/Achievements/AchievementMgr.cpp
@@ -2246,6 +2246,12 @@ char const* AchievementGlobalMgr::GetCriteriaTypeString(AchievementCriteriaTypes
     return "MISSING_TYPE";
 }
 
+AchievementGlobalMgr* AchievementGlobalMgr::instance()
+{
+    static AchievementGlobalMgr instance;
+    return &instance;
+}
+
 //==========================================================
 void AchievementGlobalMgr::LoadAchievementCriteriaList()
 {
diff --git a/src/server/game/Achievements/AchievementMgr.h b/src/server/game/Achievements/AchievementMgr.h
index cc3fd55bc3a..aba56bfbfc1 100644
--- a/src/server/game/Achievements/AchievementMgr.h
+++ b/src/server/game/Achievements/AchievementMgr.h
@@ -315,11 +315,7 @@ class AchievementGlobalMgr
         static char const* GetCriteriaTypeString(AchievementCriteriaTypes type);
         static char const* GetCriteriaTypeString(uint32 type);
 
-        static AchievementGlobalMgr* instance()
-        {
-            static AchievementGlobalMgr instance;
-            return &instance;
-        }
+        static AchievementGlobalMgr* instance();
 
         AchievementCriteriaEntryList const& GetAchievementCriteriaByType(AchievementCriteriaTypes type) const
         {
diff --git a/src/server/game/AuctionHouse/AuctionHouseMgr.cpp b/src/server/game/AuctionHouse/AuctionHouseMgr.cpp
index 01ffc9f1093..d9f5388e3ce 100644
--- a/src/server/game/AuctionHouse/AuctionHouseMgr.cpp
+++ b/src/server/game/AuctionHouse/AuctionHouseMgr.cpp
@@ -44,6 +44,12 @@ AuctionHouseMgr::~AuctionHouseMgr()
         delete itr->second;
 }
 
+AuctionHouseMgr* AuctionHouseMgr::instance()
+{
+    static AuctionHouseMgr instance;
+    return &instance;
+}
+
 AuctionHouseObject* AuctionHouseMgr::GetAuctionsMap(uint32 factionTemplateId)
 {
     if (sWorld->getBoolConfig(CONFIG_ALLOW_TWO_SIDE_INTERACTION_AUCTION))
diff --git a/src/server/game/AuctionHouse/AuctionHouseMgr.h b/src/server/game/AuctionHouse/AuctionHouseMgr.h
index fe4b9ed07de..7fc039114e7 100644
--- a/src/server/game/AuctionHouse/AuctionHouseMgr.h
+++ b/src/server/game/AuctionHouse/AuctionHouseMgr.h
@@ -153,11 +153,7 @@ class AuctionHouseMgr
         ~AuctionHouseMgr();
 
     public:
-        static AuctionHouseMgr* instance()
-        {
-            static AuctionHouseMgr instance;
-            return &instance;
-        }
+        static AuctionHouseMgr* instance();
 
         typedef std::unordered_map<ObjectGuid::LowType, Item*> ItemMap;
         typedef std::vector<AuctionEntry*> PlayerAuctions;
diff --git a/src/server/game/AuctionHouseBot/AuctionHouseBot.cpp b/src/server/game/AuctionHouseBot/AuctionHouseBot.cpp
index e1ba9a64191..74f0aaf428a 100644
--- a/src/server/game/AuctionHouseBot/AuctionHouseBot.cpp
+++ b/src/server/game/AuctionHouseBot/AuctionHouseBot.cpp
@@ -24,6 +24,12 @@
 #include "AuctionHouseBotBuyer.h"
 #include "AuctionHouseBotSeller.h"
 
+AuctionBotConfig* AuctionBotConfig::instance()
+{
+    static AuctionBotConfig instance;
+    return &instance;
+}
+
 bool AuctionBotConfig::Initialize()
 {
     GetConfigFromFile();
@@ -426,6 +432,12 @@ void AuctionHouseBot::Rebuild(bool all)
     }
 }
 
+AuctionHouseBot* AuctionHouseBot::instance()
+{
+    static AuctionHouseBot instance;
+    return &instance;
+}
+
 void AuctionHouseBot::Update()
 {
     // nothing do...
diff --git a/src/server/game/AuctionHouseBot/AuctionHouseBot.h b/src/server/game/AuctionHouseBot/AuctionHouseBot.h
index 87f76a17dcc..8f90e8fa76f 100644
--- a/src/server/game/AuctionHouseBot/AuctionHouseBot.h
+++ b/src/server/game/AuctionHouseBot/AuctionHouseBot.h
@@ -205,11 +205,7 @@ private:
     AuctionBotConfig& operator=(const AuctionBotConfig&);
 
 public:
-    static AuctionBotConfig* instance()
-    {
-        static AuctionBotConfig instance;
-        return &instance;
-    }
+    static AuctionBotConfig* instance();
 
     bool Initialize();
     const std::string& GetAHBotIncludes() const { return _AHBotIncludes; }
@@ -283,11 +279,7 @@ private:
     AuctionHouseBot& operator=(const AuctionHouseBot&);
 
 public:
-    static AuctionHouseBot* instance()
-    {
-        static AuctionHouseBot instance;
-        return &instance;
-    }
+    static AuctionHouseBot* instance();
 
     void Update();
     void Initialize();
diff --git a/src/server/game/Battlefield/BattlefieldMgr.cpp b/src/server/game/Battlefield/BattlefieldMgr.cpp
index e4c10d64682..1df87fe1d6f 100644
--- a/src/server/game/Battlefield/BattlefieldMgr.cpp
+++ b/src/server/game/Battlefield/BattlefieldMgr.cpp
@@ -32,6 +32,12 @@ BattlefieldMgr::~BattlefieldMgr()
     _battlefieldMap.clear();
 }
 
+BattlefieldMgr* BattlefieldMgr::instance()
+{
+    static BattlefieldMgr instance;
+    return &instance;
+}
+
 void BattlefieldMgr::InitBattlefield()
 {
     Battlefield* wg = new BattlefieldWG();
diff --git a/src/server/game/Battlefield/BattlefieldMgr.h b/src/server/game/Battlefield/BattlefieldMgr.h
index fabb33ae359..5d2c13538f6 100644
--- a/src/server/game/Battlefield/BattlefieldMgr.h
+++ b/src/server/game/Battlefield/BattlefieldMgr.h
@@ -27,11 +27,7 @@ class ZoneScript;
 class BattlefieldMgr
 {
     public:
-        static BattlefieldMgr* instance()
-        {
-            static BattlefieldMgr instance;
-            return &instance;
-        }
+        static BattlefieldMgr* instance();
 
         // create battlefield events
         void InitBattlefield();
diff --git a/src/server/game/Battlegrounds/ArenaTeamMgr.cpp b/src/server/game/Battlegrounds/ArenaTeamMgr.cpp
index b838131fd03..5dd0b6f29c3 100644
--- a/src/server/game/Battlegrounds/ArenaTeamMgr.cpp
+++ b/src/server/game/Battlegrounds/ArenaTeamMgr.cpp
@@ -35,6 +35,12 @@ ArenaTeamMgr::~ArenaTeamMgr()
         delete itr->second;
 }
 
+ArenaTeamMgr* ArenaTeamMgr::instance()
+{
+    static ArenaTeamMgr instance;
+    return &instance;
+}
+
 // Arena teams collection
 ArenaTeam* ArenaTeamMgr::GetArenaTeamById(uint32 arenaTeamId) const
 {
diff --git a/src/server/game/Battlegrounds/ArenaTeamMgr.h b/src/server/game/Battlegrounds/ArenaTeamMgr.h
index 432a4ff598f..269795092c7 100644
--- a/src/server/game/Battlegrounds/ArenaTeamMgr.h
+++ b/src/server/game/Battlegrounds/ArenaTeamMgr.h
@@ -27,11 +27,7 @@ private:
     ~ArenaTeamMgr();
 
 public:
-    static ArenaTeamMgr* instance()
-    {
-        static ArenaTeamMgr instance;
-        return &instance;
-    }
+    static ArenaTeamMgr* instance();
 
     typedef std::unordered_map<uint32, ArenaTeam*> ArenaTeamContainer;
 
diff --git a/src/server/game/Battlegrounds/BattlegroundMgr.cpp b/src/server/game/Battlegrounds/BattlegroundMgr.cpp
index 8942ca7a18e..683547ef3fc 100644
--- a/src/server/game/Battlegrounds/BattlegroundMgr.cpp
+++ b/src/server/game/Battlegrounds/BattlegroundMgr.cpp
@@ -76,6 +76,12 @@ void BattlegroundMgr::DeleteAllBattlegrounds()
     bgDataStore.clear();
 }
 
+BattlegroundMgr* BattlegroundMgr::instance()
+{
+    static BattlegroundMgr instance;
+    return &instance;
+}
+
 // used to update running battlegrounds, and delete finished ones
 void BattlegroundMgr::Update(uint32 diff)
 {
diff --git a/src/server/game/Battlegrounds/BattlegroundMgr.h b/src/server/game/Battlegrounds/BattlegroundMgr.h
index 595745e53fb..50100ce47f6 100644
--- a/src/server/game/Battlegrounds/BattlegroundMgr.h
+++ b/src/server/game/Battlegrounds/BattlegroundMgr.h
@@ -62,11 +62,7 @@ class BattlegroundMgr
         ~BattlegroundMgr();
 
     public:
-        static BattlegroundMgr* instance()
-        {
-            static BattlegroundMgr instance;
-            return &instance;
-        }
+        static BattlegroundMgr* instance();
 
         void Update(uint32 diff);
 
diff --git a/src/server/game/Calendar/CalendarMgr.cpp b/src/server/game/Calendar/CalendarMgr.cpp
index 9d50b290c5e..b27aac7876a 100644
--- a/src/server/game/Calendar/CalendarMgr.cpp
+++ b/src/server/game/Calendar/CalendarMgr.cpp
@@ -45,6 +45,12 @@ CalendarMgr::~CalendarMgr()
             delete *itr2;
 }
 
+CalendarMgr* CalendarMgr::instance()
+{
+    static CalendarMgr instance;
+    return &instance;
+}
+
 void CalendarMgr::LoadFromDB()
 {
     uint32 count = 0;
diff --git a/src/server/game/Calendar/CalendarMgr.h b/src/server/game/Calendar/CalendarMgr.h
index 59303a18324..084685f372c 100644
--- a/src/server/game/Calendar/CalendarMgr.h
+++ b/src/server/game/Calendar/CalendarMgr.h
@@ -281,11 +281,7 @@ class CalendarMgr
         uint64 _maxInviteId;
 
     public:
-        static CalendarMgr* instance()
-        {
-            static CalendarMgr instance;
-            return &instance;
-        }
+        static CalendarMgr* instance();
 
         void LoadFromDB();
 
diff --git a/src/server/game/Conditions/ConditionMgr.cpp b/src/server/game/Conditions/ConditionMgr.cpp
index 6da83aad1a8..50e3e64ea2c 100644
--- a/src/server/game/Conditions/ConditionMgr.cpp
+++ b/src/server/game/Conditions/ConditionMgr.cpp
@@ -928,6 +928,12 @@ bool ConditionMgr::IsObjectMeetingVendorItemConditions(uint32 creatureId, uint32
     return true;
 }
 
+ConditionMgr* ConditionMgr::instance()
+{
+    static ConditionMgr instance;
+    return &instance;
+}
+
 void ConditionMgr::LoadConditions(bool isReload)
 {
     uint32 oldMSTime = getMSTime();
diff --git a/src/server/game/Conditions/ConditionMgr.h b/src/server/game/Conditions/ConditionMgr.h
index 7dc4592a6a9..0b49552acb4 100644
--- a/src/server/game/Conditions/ConditionMgr.h
+++ b/src/server/game/Conditions/ConditionMgr.h
@@ -231,11 +231,7 @@ class ConditionMgr
         ~ConditionMgr();
 
     public:
-        static ConditionMgr* instance()
-        {
-            static ConditionMgr instance;
-            return &instance;
-        }
+        static ConditionMgr* instance();
 
         void LoadConditions(bool isReload = false);
         bool isConditionTypeValid(Condition* cond) const;
diff --git a/src/server/game/DungeonFinding/LFGMgr.cpp b/src/server/game/DungeonFinding/LFGMgr.cpp
index b0a1777f19a..fe997bc0343 100644
--- a/src/server/game/DungeonFinding/LFGMgr.cpp
+++ b/src/server/game/DungeonFinding/LFGMgr.cpp
@@ -261,6 +261,12 @@ void LFGMgr::LoadLFGDungeons(bool reload /* = false */)
     }
 }
 
+LFGMgr* LFGMgr::instance()
+{
+    static LFGMgr instance;
+    return &instance;
+}
+
 void LFGMgr::Update(uint32 diff)
 {
     if (!isOptionEnabled(LFG_OPTION_ENABLE_DUNGEON_FINDER | LFG_OPTION_ENABLE_RAID_BROWSER))
diff --git a/src/server/game/DungeonFinding/LFGMgr.h b/src/server/game/DungeonFinding/LFGMgr.h
index 90a8d802f9d..7be08d448db 100644
--- a/src/server/game/DungeonFinding/LFGMgr.h
+++ b/src/server/game/DungeonFinding/LFGMgr.h
@@ -296,11 +296,7 @@ class LFGMgr
         ~LFGMgr();
 
     public:
-        static LFGMgr* instance()
-        {
-            static LFGMgr instance;
-            return &instance;
-        }
+        static LFGMgr* instance();
 
         // Functions used outside lfg namespace
         void Update(uint32 diff);
diff --git a/src/server/game/Entities/Creature/CreatureGroups.cpp b/src/server/game/Entities/Creature/CreatureGroups.cpp
index 9f26c927374..0c41089efce 100644
--- a/src/server/game/Entities/Creature/CreatureGroups.cpp
+++ b/src/server/game/Entities/Creature/CreatureGroups.cpp
@@ -30,6 +30,12 @@ FormationMgr::~FormationMgr()
         delete itr->second;
 }
 
+FormationMgr* FormationMgr::instance()
+{
+    static FormationMgr instance;
+    return &instance;
+}
+
 void FormationMgr::AddCreatureToGroup(uint32 leaderGuid, Creature* creature)
 {
     Map* map = creature->FindMap();
diff --git a/src/server/game/Entities/Creature/CreatureGroups.h b/src/server/game/Entities/Creature/CreatureGroups.h
index 7b16585a996..d337d388b6e 100644
--- a/src/server/game/Entities/Creature/CreatureGroups.h
+++ b/src/server/game/Entities/Creature/CreatureGroups.h
@@ -45,11 +45,7 @@ class FormationMgr
         ~FormationMgr();
 
     public:
-        static FormationMgr* instance()
-        {
-            static FormationMgr instance;
-            return &instance;
-        }
+        static FormationMgr* instance();
 
         void AddCreatureToGroup(uint32 group_id, Creature* creature);
         void RemoveCreatureFromGroup(CreatureGroup* group, Creature* creature);
diff --git a/src/server/game/Entities/Player/SocialMgr.cpp b/src/server/game/Entities/Player/SocialMgr.cpp
index ffb2d8a7dd8..809bdd0bf6f 100644
--- a/src/server/game/Entities/Player/SocialMgr.cpp
+++ b/src/server/game/Entities/Player/SocialMgr.cpp
@@ -195,6 +195,12 @@ SocialMgr::SocialMgr() { }
 
 SocialMgr::~SocialMgr() { }
 
+SocialMgr* SocialMgr::instance()
+{
+    static SocialMgr instance;
+    return &instance;
+}
+
 void SocialMgr::GetFriendInfo(Player* player, ObjectGuid::LowType friendGUID, FriendInfo &friendInfo)
 {
     if (!player)
diff --git a/src/server/game/Entities/Player/SocialMgr.h b/src/server/game/Entities/Player/SocialMgr.h
index 8f8ed04b5fb..0512e61033c 100644
--- a/src/server/game/Entities/Player/SocialMgr.h
+++ b/src/server/game/Entities/Player/SocialMgr.h
@@ -128,11 +128,7 @@ class SocialMgr
         ~SocialMgr();
 
     public:
-        static SocialMgr* instance()
-        {
-            static SocialMgr instance;
-            return &instance;
-        }
+        static SocialMgr* instance();
 
         // Misc
         void RemovePlayerSocial(ObjectGuid::LowType guid) { m_socialMap.erase(guid); }
diff --git a/src/server/game/Events/GameEventMgr.cpp b/src/server/game/Events/GameEventMgr.cpp
index 79584c6261e..bb8e89d4829 100644
--- a/src/server/game/Events/GameEventMgr.cpp
+++ b/src/server/game/Events/GameEventMgr.cpp
@@ -29,6 +29,12 @@
 #include "UnitAI.h"
 #include "GameObjectAI.h"
 
+GameEventMgr* GameEventMgr::instance()
+{
+    static GameEventMgr instance;
+    return &instance;
+}
+
 bool GameEventMgr::CheckOneGameEvent(uint16 entry) const
 {
     switch (mGameEvent[entry].state)
diff --git a/src/server/game/Events/GameEventMgr.h b/src/server/game/Events/GameEventMgr.h
index b8d281dfdd7..d2982a402f2 100644
--- a/src/server/game/Events/GameEventMgr.h
+++ b/src/server/game/Events/GameEventMgr.h
@@ -100,11 +100,7 @@ class GameEventMgr
         ~GameEventMgr() { }
 
     public:
-        static GameEventMgr* instance()
-        {
-            static GameEventMgr instance;
-            return &instance;
-        }
+        static GameEventMgr* instance();
 
         typedef std::set<uint16> ActiveEvents;
         typedef std::vector<GameEventData> GameEventDataMap;
diff --git a/src/server/game/Globals/ObjectMgr.cpp b/src/server/game/Globals/ObjectMgr.cpp
index f45634e9684..cbb1e03d77c 100644
--- a/src/server/game/Globals/ObjectMgr.cpp
+++ b/src/server/game/Globals/ObjectMgr.cpp
@@ -235,6 +235,12 @@ ObjectMgr::ObjectMgr():
     }
 }
 
+ObjectMgr* ObjectMgr::instance()
+{
+    static ObjectMgr instance;
+    return &instance;
+}
+
 ObjectMgr::~ObjectMgr()
 {
     for (QuestMap::iterator i = _questTemplates.begin(); i != _questTemplates.end(); ++i)
diff --git a/src/server/game/Globals/ObjectMgr.h b/src/server/game/Globals/ObjectMgr.h
index ae1258713f5..3d6ae293edb 100644
--- a/src/server/game/Globals/ObjectMgr.h
+++ b/src/server/game/Globals/ObjectMgr.h
@@ -680,11 +680,13 @@ class ObjectMgr
         ~ObjectMgr();
 
     public:
-        static ObjectMgr* instance()
-        {
-            static ObjectMgr instance;
-            return &instance;
-        }
+        ObjectMgr(ObjectMgr const&) = delete;
+        ObjectMgr(ObjectMgr&&) = delete;
+
+        ObjectMgr& operator= (ObjectMgr const&) = delete;
+        ObjectMgr& operator= (ObjectMgr&&) = delete;
+
+        static ObjectMgr* instance();
 
         typedef std::unordered_map<uint32, Item*> ItemMap;
 
diff --git a/src/server/game/Groups/GroupMgr.cpp b/src/server/game/Groups/GroupMgr.cpp
index 0fd2e7c7095..a5aa432aadc 100644
--- a/src/server/game/Groups/GroupMgr.cpp
+++ b/src/server/game/Groups/GroupMgr.cpp
@@ -92,6 +92,12 @@ ObjectGuid::LowType GroupMgr::GenerateGroupId()
     return NextGroupId++;
 }
 
+GroupMgr* GroupMgr::instance()
+{
+    static GroupMgr instance;
+    return &instance;
+}
+
 Group* GroupMgr::GetGroupByGUID(ObjectGuid::LowType groupId) const
 {
     GroupContainer::const_iterator itr = GroupStore.find(groupId);
diff --git a/src/server/game/Groups/GroupMgr.h b/src/server/game/Groups/GroupMgr.h
index 9afdddd0f18..ee6ae18f3ea 100644
--- a/src/server/game/Groups/GroupMgr.h
+++ b/src/server/game/Groups/GroupMgr.h
@@ -27,11 +27,7 @@ private:
     ~GroupMgr();
 
 public:
-    static GroupMgr* instance()
-    {
-        static GroupMgr instance;
-        return &instance;
-    }
+    static GroupMgr* instance();
 
     typedef std::map<ObjectGuid::LowType, Group*> GroupContainer;
     typedef std::vector<Group*>      GroupDbContainer;
diff --git a/src/server/game/Guilds/GuildMgr.cpp b/src/server/game/Guilds/GuildMgr.cpp
index 2d4fb849fb5..a4d245cbc9b 100644
--- a/src/server/game/Guilds/GuildMgr.cpp
+++ b/src/server/game/Guilds/GuildMgr.cpp
@@ -79,6 +79,12 @@ std::string GuildMgr::GetGuildNameById(ObjectGuid::LowType guildId) const
     return "";
 }
 
+GuildMgr* GuildMgr::instance()
+{
+    static GuildMgr instance;
+    return &instance;
+}
+
 Guild* GuildMgr::GetGuildByLeader(ObjectGuid guid) const
 {
     for (GuildContainer::const_iterator itr = GuildStore.begin(); itr != GuildStore.end(); ++itr)
diff --git a/src/server/game/Guilds/GuildMgr.h b/src/server/game/Guilds/GuildMgr.h
index a97a59cafe0..d8662f50f43 100644
--- a/src/server/game/Guilds/GuildMgr.h
+++ b/src/server/game/Guilds/GuildMgr.h
@@ -27,11 +27,7 @@ private:
     ~GuildMgr();
 
 public:
-    static GuildMgr* instance()
-    {
-        static GuildMgr instance;
-        return &instance;
-    }
+    static GuildMgr* instance();
 
     Guild* GetGuildByLeader(ObjectGuid guid) const;
     Guild* GetGuildById(ObjectGuid::LowType guildId) const;
diff --git a/src/server/game/Handlers/AddonHandler.cpp b/src/server/game/Handlers/AddonHandler.cpp
index ad44e0993e4..c72fc08982c 100644
--- a/src/server/game/Handlers/AddonHandler.cpp
+++ b/src/server/game/Handlers/AddonHandler.cpp
@@ -21,6 +21,12 @@
 #include "Opcodes.h"
 #include "Log.h"
 
+AddonHandler* AddonHandler::instance()
+{
+    static AddonHandler instance;
+    return &instance;
+}
+
 bool AddonHandler::BuildAddonPacket(WorldPacket* source, WorldPacket* target)
 {
     ByteBuffer AddOnPacked;
diff --git a/src/server/game/Handlers/AddonHandler.h b/src/server/game/Handlers/AddonHandler.h
index 1e8081e0913..0113695895a 100644
--- a/src/server/game/Handlers/AddonHandler.h
+++ b/src/server/game/Handlers/AddonHandler.h
@@ -26,11 +26,7 @@
 class AddonHandler
 {
     public:
-        static AddonHandler* instance()
-        {
-            static AddonHandler instance;
-            return &instance;
-        }
+        static AddonHandler* instance();
 
         bool BuildAddonPacket(WorldPacket* Source, WorldPacket* Target);
 
diff --git a/src/server/game/Instances/InstanceSaveMgr.cpp b/src/server/game/Instances/InstanceSaveMgr.cpp
index 3538262ed35..88677fc04f4 100644
--- a/src/server/game/Instances/InstanceSaveMgr.cpp
+++ b/src/server/game/Instances/InstanceSaveMgr.cpp
@@ -38,6 +38,12 @@ InstanceSaveManager::~InstanceSaveManager()
 {
 }
 
+InstanceSaveManager* InstanceSaveManager::instance()
+{
+    static InstanceSaveManager instance;
+    return &instance;
+}
+
 void InstanceSaveManager::Unload()
 {
     lock_instLists = true;
diff --git a/src/server/game/Instances/InstanceSaveMgr.h b/src/server/game/Instances/InstanceSaveMgr.h
index d2b3237b3cf..255b68165e3 100644
--- a/src/server/game/Instances/InstanceSaveMgr.h
+++ b/src/server/game/Instances/InstanceSaveMgr.h
@@ -158,11 +158,7 @@ class InstanceSaveManager
     public:
         typedef std::unordered_map<uint32 /*InstanceId*/, InstanceSave*> InstanceSaveHashMap;
 
-        static InstanceSaveManager* instance()
-        {
-            static InstanceSaveManager instance;
-            return &instance;
-        }
+        static InstanceSaveManager* instance();
 
         void Unload();
 
diff --git a/src/server/game/Maps/MapManager.cpp b/src/server/game/Maps/MapManager.cpp
index e5f364e39f4..c1882b3dc75 100644
--- a/src/server/game/Maps/MapManager.cpp
+++ b/src/server/game/Maps/MapManager.cpp
@@ -62,6 +62,12 @@ void MapManager::InitializeVisibilityDistanceInfo()
         (*iter).second->InitVisibilityDistance();
 }
 
+MapManager* MapManager::instance()
+{
+    static MapManager instance;
+    return &instance;
+}
+
 Map* MapManager::CreateBaseMap(uint32 id)
 {
     Map* map = FindBaseMap(id);
diff --git a/src/server/game/Maps/MapManager.h b/src/server/game/Maps/MapManager.h
index 7f9621593d4..b13d6552022 100644
--- a/src/server/game/Maps/MapManager.h
+++ b/src/server/game/Maps/MapManager.h
@@ -31,11 +31,7 @@ struct TransportCreatureProto;
 class MapManager
 {
     public:
-        static MapManager* instance()
-        {
-            static MapManager instance;
-            return &instance;
-        }
+        static MapManager* instance();
 
         Map* CreateBaseMap(uint32 mapId);
         Map* FindBaseNonInstanceMap(uint32 mapId) const;
diff --git a/src/server/game/Maps/TransportMgr.cpp b/src/server/game/Maps/TransportMgr.cpp
index afbddc5e686..c94dd860dea 100644
--- a/src/server/game/Maps/TransportMgr.cpp
+++ b/src/server/game/Maps/TransportMgr.cpp
@@ -36,6 +36,12 @@ TransportMgr::TransportMgr() { }
 
 TransportMgr::~TransportMgr() { }
 
+TransportMgr* TransportMgr::instance()
+{
+    static TransportMgr instance;
+    return &instance;
+}
+
 void TransportMgr::Unload()
 {
     _transportTemplates.clear();
diff --git a/src/server/game/Maps/TransportMgr.h b/src/server/game/Maps/TransportMgr.h
index 0bfb5b7a410..32fca6bd26e 100644
--- a/src/server/game/Maps/TransportMgr.h
+++ b/src/server/game/Maps/TransportMgr.h
@@ -101,11 +101,7 @@ class TransportMgr
         friend void LoadDBCStores(std::string const&);
 
     public:
-        static TransportMgr* instance()
-        {
-            static TransportMgr instance;
-            return &instance;
-        }
+        static TransportMgr* instance();
 
         void Unload();
 
diff --git a/src/server/game/Movement/Waypoints/WaypointManager.cpp b/src/server/game/Movement/Waypoints/WaypointManager.cpp
index e0639e38e77..dc935263927 100644
--- a/src/server/game/Movement/Waypoints/WaypointManager.cpp
+++ b/src/server/game/Movement/Waypoints/WaypointManager.cpp
@@ -94,6 +94,12 @@ void WaypointMgr::Load()
     TC_LOG_INFO("server.loading", ">> Loaded %u waypoints in %u ms", count, GetMSTimeDiffToNow(oldMSTime));
 }
 
+WaypointMgr* WaypointMgr::instance()
+{
+    static WaypointMgr instance;
+    return &instance;
+}
+
 void WaypointMgr::ReloadPath(uint32 id)
 {
     WaypointPathContainer::iterator itr = _waypointStore.find(id);
diff --git a/src/server/game/Movement/Waypoints/WaypointManager.h b/src/server/game/Movement/Waypoints/WaypointManager.h
index d519eee4793..a1f98c52b0b 100644
--- a/src/server/game/Movement/Waypoints/WaypointManager.h
+++ b/src/server/game/Movement/Waypoints/WaypointManager.h
@@ -47,11 +47,7 @@ typedef std::unordered_map<uint32, WaypointPath> WaypointPathContainer;
 class WaypointMgr
 {
     public:
-        static WaypointMgr* instance()
-        {
-            static WaypointMgr instance;
-            return &instance;
-        }
+        static WaypointMgr* instance();
 
         // Attempts to reload a single path from database
         void ReloadPath(uint32 id);
diff --git a/src/server/game/OutdoorPvP/OutdoorPvPMgr.cpp b/src/server/game/OutdoorPvP/OutdoorPvPMgr.cpp
index 8296cdfb7ea..7f0695e16b3 100644
--- a/src/server/game/OutdoorPvP/OutdoorPvPMgr.cpp
+++ b/src/server/game/OutdoorPvP/OutdoorPvPMgr.cpp
@@ -37,6 +37,12 @@ void OutdoorPvPMgr::Die()
         delete itr->second;
 }
 
+OutdoorPvPMgr* OutdoorPvPMgr::instance()
+{
+    static OutdoorPvPMgr instance;
+    return &instance;
+}
+
 void OutdoorPvPMgr::InitOutdoorPvP()
 {
     uint32 oldMSTime = getMSTime();
diff --git a/src/server/game/OutdoorPvP/OutdoorPvPMgr.h b/src/server/game/OutdoorPvP/OutdoorPvPMgr.h
index 8a113987882..b1158075c57 100644
--- a/src/server/game/OutdoorPvP/OutdoorPvPMgr.h
+++ b/src/server/game/OutdoorPvP/OutdoorPvPMgr.h
@@ -42,11 +42,7 @@ class OutdoorPvPMgr
         ~OutdoorPvPMgr() { };
 
     public:
-        static OutdoorPvPMgr* instance()
-        {
-            static OutdoorPvPMgr instance;
-            return &instance;
-        }
+        static OutdoorPvPMgr* instance();
 
         // create outdoor pvp events
         void InitOutdoorPvP();
diff --git a/src/server/game/Pools/PoolMgr.cpp b/src/server/game/Pools/PoolMgr.cpp
index 12fb8a06b62..81d318fb1d9 100644
--- a/src/server/game/Pools/PoolMgr.cpp
+++ b/src/server/game/Pools/PoolMgr.cpp
@@ -570,6 +570,12 @@ void PoolMgr::Initialize()
     mCreatureSearchMap.clear();
 }
 
+PoolMgr* PoolMgr::instance()
+{
+    static PoolMgr instance;
+    return &instance;
+}
+
 void PoolMgr::LoadFromDB()
 {
     // Pool templates
diff --git a/src/server/game/Pools/PoolMgr.h b/src/server/game/Pools/PoolMgr.h
index 51e0bcb4cac..6c48a011b73 100644
--- a/src/server/game/Pools/PoolMgr.h
+++ b/src/server/game/Pools/PoolMgr.h
@@ -108,11 +108,7 @@ class PoolMgr
         ~PoolMgr() { };
 
     public:
-        static PoolMgr* instance()
-        {
-            static PoolMgr instance;
-            return &instance;
-        }
+        static PoolMgr* instance();
 
         void LoadFromDB();
         void LoadQuestPools();
diff --git a/src/server/game/Scripting/ScriptMgr.cpp b/src/server/game/Scripting/ScriptMgr.cpp
index 4b26ba96c9b..cbf2dde2887 100644
--- a/src/server/game/Scripting/ScriptMgr.cpp
+++ b/src/server/game/Scripting/ScriptMgr.cpp
@@ -246,6 +246,12 @@ ScriptMgr::ScriptMgr() : _scriptCount(0), _scheduledScripts(0)
 
 ScriptMgr::~ScriptMgr() { }
 
+ScriptMgr* ScriptMgr::instance()
+{
+    static ScriptMgr instance;
+    return &instance;
+}
+
 void ScriptMgr::Initialize()
 {
     uint32 oldMSTime = getMSTime();
diff --git a/src/server/game/Scripting/ScriptMgr.h b/src/server/game/Scripting/ScriptMgr.h
index 8a00305b4da..750298eec86 100644
--- a/src/server/game/Scripting/ScriptMgr.h
+++ b/src/server/game/Scripting/ScriptMgr.h
@@ -857,11 +857,7 @@ class ScriptMgr
         virtual ~ScriptMgr();
 
     public: /* Initialization */
-        static ScriptMgr* instance()
-        {
-            static ScriptMgr instance;
-            return &instance;
-        }
+        static ScriptMgr* instance();
 
         void Initialize();
         void LoadDatabase();
diff --git a/src/server/game/Scripting/ScriptSystem.cpp b/src/server/game/Scripting/ScriptSystem.cpp
index e828830ec0f..309838a919e 100644
--- a/src/server/game/Scripting/ScriptSystem.cpp
+++ b/src/server/game/Scripting/ScriptSystem.cpp
@@ -23,6 +23,12 @@
 
 ScriptPointVector const SystemMgr::_empty;
 
+SystemMgr* SystemMgr::instance()
+{
+    static SystemMgr instance;
+    return &instance;
+}
+
 void SystemMgr::LoadScriptWaypoints()
 {
     uint32 oldMSTime = getMSTime();
diff --git a/src/server/game/Scripting/ScriptSystem.h b/src/server/game/Scripting/ScriptSystem.h
index 74c51e5b136..9e6a0d2a5a7 100644
--- a/src/server/game/Scripting/ScriptSystem.h
+++ b/src/server/game/Scripting/ScriptSystem.h
@@ -52,11 +52,7 @@ class SystemMgr
         ~SystemMgr() { }
 
     public:
-        static SystemMgr* instance()
-        {
-            static SystemMgr instance;
-            return &instance;
-        }
+        static SystemMgr* instance();
 
         typedef std::unordered_map<uint32, ScriptPointVector> PointMoveMap;
 
diff --git a/src/server/game/Server/Protocol/PacketLog.cpp b/src/server/game/Server/Protocol/PacketLog.cpp
index 57b76304a77..11a02828998 100644
--- a/src/server/game/Server/Protocol/PacketLog.cpp
+++ b/src/server/game/Server/Protocol/PacketLog.cpp
@@ -69,6 +69,12 @@ PacketLog::~PacketLog()
     _file = NULL;
 }
 
+PacketLog* PacketLog::instance()
+{
+    static PacketLog instance;
+    return &instance;
+}
+
 void PacketLog::Initialize()
 {
     std::string logsDir = sConfigMgr->GetStringDefault("LogsDir", "");
diff --git a/src/server/game/Server/Protocol/PacketLog.h b/src/server/game/Server/Protocol/PacketLog.h
index 45a3f0a4655..b211cfbf3ca 100644
--- a/src/server/game/Server/Protocol/PacketLog.h
+++ b/src/server/game/Server/Protocol/PacketLog.h
@@ -40,11 +40,7 @@ class PacketLog
         std::once_flag _initializeFlag;
 
     public:
-        static PacketLog* instance()
-        {
-            static PacketLog instance;
-            return &instance;
-        }
+        static PacketLog* instance();
 
         void Initialize();
         bool CanLogPacket() const { return (_file != NULL); }
diff --git a/src/server/game/Server/WorldSocketMgr.cpp b/src/server/game/Server/WorldSocketMgr.cpp
index e8f8c59f4af..cbdb6a4a70b 100644
--- a/src/server/game/Server/WorldSocketMgr.cpp
+++ b/src/server/game/Server/WorldSocketMgr.cpp
@@ -47,6 +47,12 @@ WorldSocketMgr::WorldSocketMgr() : BaseSocketMgr(), _socketSendBufferSize(-1), m
 {
 }
 
+WorldSocketMgr& WorldSocketMgr::Instance()
+{
+    static WorldSocketMgr instance;
+    return instance;
+}
+
 bool WorldSocketMgr::StartNetwork(boost::asio::io_service& service, std::string const& bindIp, uint16 port)
 {
     _tcpNoDelay = sConfigMgr->GetBoolDefault("Network.TcpNodelay", true);
diff --git a/src/server/game/Server/WorldSocketMgr.h b/src/server/game/Server/WorldSocketMgr.h
index 38e2e7abb69..fddf3bee4c6 100644
--- a/src/server/game/Server/WorldSocketMgr.h
+++ b/src/server/game/Server/WorldSocketMgr.h
@@ -35,11 +35,7 @@ class WorldSocketMgr : public SocketMgr<WorldSocket>
     typedef SocketMgr<WorldSocket> BaseSocketMgr;
 
 public:
-    static WorldSocketMgr& Instance()
-    {
-        static WorldSocketMgr instance;
-        return instance;
-    }
+    static WorldSocketMgr& Instance();
 
     /// Start network, listen at address:port .
     bool StartNetwork(boost::asio::io_service& service, std::string const& bindIp, uint16 port) override;
diff --git a/src/server/game/Spells/SpellMgr.cpp b/src/server/game/Spells/SpellMgr.cpp
index 0f80d83e0ff..8bb0e401a6c 100644
--- a/src/server/game/Spells/SpellMgr.cpp
+++ b/src/server/game/Spells/SpellMgr.cpp
@@ -353,6 +353,12 @@ SpellMgr::~SpellMgr()
     UnloadSpellInfoStore();
 }
 
+SpellMgr* SpellMgr::instance()
+{
+    static SpellMgr instance;
+    return &instance;
+}
+
 /// Some checks for spells, to prevent adding deprecated/broken spells for trainers, spell book, etc
 bool SpellMgr::IsSpellValid(SpellInfo const* spellInfo, Player* player, bool msg)
 {
diff --git a/src/server/game/Spells/SpellMgr.h b/src/server/game/Spells/SpellMgr.h
index 651a8cde938..827e3c671ab 100644
--- a/src/server/game/Spells/SpellMgr.h
+++ b/src/server/game/Spells/SpellMgr.h
@@ -608,11 +608,7 @@ class SpellMgr
 
     // Accessors (const or static functions)
     public:
-        static SpellMgr* instance()
-        {
-            static SpellMgr instance;
-            return &instance;
-        }
+        static SpellMgr* instance();
 
         // Spell correctness for client using
         static bool IsSpellValid(SpellInfo const* spellInfo, Player* player = NULL, bool msg = true);
diff --git a/src/server/game/Texts/CreatureTextMgr.cpp b/src/server/game/Texts/CreatureTextMgr.cpp
index 499f0c9cbf0..d8df3310765 100644
--- a/src/server/game/Texts/CreatureTextMgr.cpp
+++ b/src/server/game/Texts/CreatureTextMgr.cpp
@@ -72,6 +72,12 @@ class PlayerTextBuilder
         WorldObject const* _target;
 };
 
+CreatureTextMgr* CreatureTextMgr::instance()
+{
+    static CreatureTextMgr instance;
+    return &instance;
+}
+
 void CreatureTextMgr::LoadCreatureTexts()
 {
     uint32 oldMSTime = getMSTime();
diff --git a/src/server/game/Texts/CreatureTextMgr.h b/src/server/game/Texts/CreatureTextMgr.h
index 28fd98f21a8..e364eb6eefa 100644
--- a/src/server/game/Texts/CreatureTextMgr.h
+++ b/src/server/game/Texts/CreatureTextMgr.h
@@ -82,11 +82,7 @@ class CreatureTextMgr
         ~CreatureTextMgr() { }
 
     public:
-        static CreatureTextMgr* instance()
-        {
-            static CreatureTextMgr instance;
-            return &instance;
-        }
+        static CreatureTextMgr* instance();
 
         void LoadCreatureTexts();
         void LoadCreatureTextLocales();
diff --git a/src/server/game/Tickets/TicketMgr.cpp b/src/server/game/Tickets/TicketMgr.cpp
index 1cf68eec9c7..94e4427fe10 100644
--- a/src/server/game/Tickets/TicketMgr.cpp
+++ b/src/server/game/Tickets/TicketMgr.cpp
@@ -284,6 +284,12 @@ void TicketMgr::ResetTickets()
     CharacterDatabase.Execute(stmt);
 }
 
+TicketMgr* TicketMgr::instance()
+{
+    static TicketMgr instance;
+    return &instance;
+}
+
 void TicketMgr::LoadTickets()
 {
     uint32 oldMSTime = getMSTime();
diff --git a/src/server/game/Tickets/TicketMgr.h b/src/server/game/Tickets/TicketMgr.h
index 9cc1d20b122..59f38e6d23f 100644
--- a/src/server/game/Tickets/TicketMgr.h
+++ b/src/server/game/Tickets/TicketMgr.h
@@ -188,11 +188,7 @@ private:
     ~TicketMgr();
 
 public:
-    static TicketMgr* instance()
-    {
-        static TicketMgr instance;
-        return &instance;
-    }
+    static TicketMgr* instance();
 
     void LoadTickets();
     void LoadSurveys();
diff --git a/src/server/game/Warden/WardenCheckMgr.cpp b/src/server/game/Warden/WardenCheckMgr.cpp
index 5c4b0fc05b7..13ddae012fe 100644
--- a/src/server/game/Warden/WardenCheckMgr.cpp
+++ b/src/server/game/Warden/WardenCheckMgr.cpp
@@ -189,6 +189,12 @@ void WardenCheckMgr::LoadWardenOverrides()
     TC_LOG_INFO("server.loading", ">> Loaded %u warden action overrides.", count);
 }
 
+WardenCheckMgr* WardenCheckMgr::instance()
+{
+    static WardenCheckMgr instance;
+    return &instance;
+}
+
 WardenCheck* WardenCheckMgr::GetWardenDataById(uint16 Id)
 {
     if (Id < CheckStore.size())
diff --git a/src/server/game/Warden/WardenCheckMgr.h b/src/server/game/Warden/WardenCheckMgr.h
index 4107ccc3aff..a09dc3a6dbb 100644
--- a/src/server/game/Warden/WardenCheckMgr.h
+++ b/src/server/game/Warden/WardenCheckMgr.h
@@ -55,11 +55,7 @@ class WardenCheckMgr
         ~WardenCheckMgr();
 
     public:
-        static WardenCheckMgr* instance()
-        {
-            static WardenCheckMgr instance;
-            return &instance;
-        }
+        static WardenCheckMgr* instance();
 
         // We have a linear key without any gaps, so we use vector for fast access
         typedef std::vector<WardenCheck*> CheckContainer;
diff --git a/src/server/game/World/World.cpp b/src/server/game/World/World.cpp
index 8a29bfe78b0..8496dc08e6e 100644
--- a/src/server/game/World/World.cpp
+++ b/src/server/game/World/World.cpp
@@ -140,6 +140,12 @@ World::~World()
     /// @todo free addSessQueue
 }
 
+World* World::instance()
+{
+    static World instance;
+    return &instance;
+}
+
 /// Find a player in a specified zone
 Player* World::FindPlayerInZone(uint32 zone)
 {
diff --git a/src/server/game/World/World.h b/src/server/game/World/World.h
index bf7d2cb00f7..4f53bfd4592 100644
--- a/src/server/game/World/World.h
+++ b/src/server/game/World/World.h
@@ -538,11 +538,7 @@ struct CharacterInfo
 class World
 {
     public:
-        static World* instance()
-        {
-            static World instance;
-            return &instance;
-        }
+        static World* instance();
 
         static std::atomic<uint32> m_worldLoopCounter;