feat(Core/Misc): remove and replace ACE_Singleton (#2418)

src/server/game/Movement/Waypoints/WaypointManager.cpp

@@ -27,6 +27,12 @@ WaypointMgr::~WaypointMgr()
     _waypointStore.clear();
 }
 
+WaypointMgr* WaypointMgr::instance()
+{
+    static WaypointMgr instance;
+    return &instance;
+}
+
 void WaypointMgr::Load()
 {
     uint32 oldMSTime = getMSTime();

src/server/game/Movement/Waypoints/WaypointManager.h

@@ -7,9 +7,9 @@
 #ifndef ACORE_WAYPOINTMANAGER_H
 #define ACORE_WAYPOINTMANAGER_H
 
-#include <ace/Singleton.h>
-#include <ace/Null_Mutex.h>
+#include "Common.h"
 #include <vector>
+#include <unordered_map>
 
 enum WaypointMoveType
 {
@@ -36,9 +36,9 @@ typedef std::unordered_map<uint32, WaypointPath> WaypointPathContainer;
 
 class WaypointMgr
 {
-        friend class ACE_Singleton<WaypointMgr, ACE_Null_Mutex>;
-
     public:
+        static WaypointMgr* instance();
+
         // Attempts to reload a single path from database
         void ReloadPath(uint32 id);
 
@@ -52,17 +52,16 @@ class WaypointMgr
             if (itr != _waypointStore.end())
                 return &itr->second;
 
-            return NULL;
+            return nullptr;
         }
 
     private:
-        // Only allow instantiation from ACE_Singleton
         WaypointMgr();
         ~WaypointMgr();
 
         WaypointPathContainer _waypointStore;
 };
 
-#define sWaypointMgr ACE_Singleton<WaypointMgr, ACE_Null_Mutex>::instance()
+#define sWaypointMgr WaypointMgr::instance()
 
 #endif