Core/Player: Prevented infinite growth of allowedCharsToLogin container and changed its type to better reflect its purpose

src/server/game/Server/Protocol/Handlers/CharacterHandler.cpp

@@ -205,6 +205,7 @@ void WorldSession::HandleCharEnum(QueryResult result)
 
     data << num;
 
+    _allowedCharsToLogin.clear();
     if (result)
     {
         do
@@ -213,7 +214,7 @@ void WorldSession::HandleCharEnum(QueryResult result)
             sLog->outDetail("Loading char guid %u from account %u.",guidlow,GetAccountId());
             if (Player::BuildEnumData(result, &data))
             {
-                m_AllowedCharsToLogin.push_back(guidlow);
+                _allowedCharsToLogin.insert(guidlow);
                 ++num;
             }
         }

src/server/game/Server/WorldSession.h

@@ -883,17 +883,13 @@ class WorldSession
         void LogUnprocessedTail(WorldPacket *packet);
 
         // EnumData helpers
-        bool CharCanLogin(uint32 LowGUID)
+        bool CharCanLogin(uint32 lowGUID)
         {
-            if (find(m_AllowedCharsToLogin.begin(),
-                     m_AllowedCharsToLogin.end(),
-                     LowGUID) == m_AllowedCharsToLogin.end())
-                return false;
-            return true;
+            return _allowedCharsToLogin.find(lowGUID) != _allowedCharsToLogin.end();
         }
         // this stores the GUIDs of the characters who can login
         // characters who failed on Player::BuildEnumData shouldn't login
-        std::list<uint32> m_AllowedCharsToLogin;
+        std::set<uint32> _allowedCharsToLogin;
 
         uint32 m_GUIDLow;                                   // set loggined or recently logout player (while m_playerRecentlyLogout set)
         Player *_player;