source: binary-improvements/AllocsCommands/PrivateMessageConnections.cs@ 274

using System;
using System.Collections.Generic;

namespace AllocsFixes.CustomCommands
{
        public class PrivateMessageConnections
        {
                private static Dictionary<ClientInfo, ClientInfo> senderOfLastPM = new Dictionary<ClientInfo, ClientInfo> ();

                public static void SetLastPMSender (ClientInfo _sender, ClientInfo _receiver)
                {
                        if (senderOfLastPM.ContainsKey (_receiver))
                                senderOfLastPM [_receiver] = _sender;
                        else
                                senderOfLastPM.Add (_receiver, _sender);
                }

                public static ClientInfo GetLastPMSenderForPlayer (ClientInfo _player)
                {
                        if (senderOfLastPM.ContainsKey (_player))
                                return senderOfLastPM [_player];
                        return null;
                }
        }
}