sessionList.h

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#ifndef SESSION_LIST_H
#define SESSION_LIST_H
#include <memory>
#include <list>
#include <mutex>
class Session;
 
class SessionList
{ public:
    class ListKey
    { 
      friend class SessionList;
      public:
        std::list<Session *> & GetList(void)
        { return m_slist.m_sessions;
        }
        
        ~ListKey(void)
        { m_slist.m_lock.unlock();
        }
        
      private:
        ListKey(SessionList &slist) : m_slist(slist)
        { m_slist.m_lock.lock();
        }
        
        SessionList &m_slist;       
    };
 
    typedef std::unique_ptr<SessionList::ListKey> KeyPtr;
 
    KeyPtr TakeList(void)
    { return KeyPtr(new ListKey(*this));
    }
    
  private:
    std::mutex m_lock;               
    std::list<Session *> m_sessions; 
};
 
#endif