Lua safe objects Eluna

-- Safe player pointers
-- Returns nil if player is not available

local players = {}
local function OnLogin(event, player)
    local guid = player:GetGUIDLow()
    if (players[guid] == false) then -- use a small trick to use false as true here, while using it as false in SafeGetPlayer
        players[guid] = player -- renew
    end
end
local function OnLogout(event, player)
    players[player:GetGUIDLow()] = false -- false marks that the player should be saved back to store on login
end

RegisterPlayerEvent(3, OnLogin)
RegisterPlayerEvent(4, OnLogout)


-- Functions for scripts:
-- Store player (from now on)
function Player:Store() -- Can be used as player:Store()
    players[self:GetGUIDLow()] = self
end
-- Remove player from store
function Player:Remove(guidlow) -- Can be used as player:Remove() or player.Remove(guidlow) or Player.Remove(guidlow) or Player:Remove(guidlow)
    players[guidlow or self:GetGUIDLow()] = nil
end
-- Get player or nil
function SafeGetPlayer(guidlow) -- Can be used as SafeGetPlayer(guidlow)
    return players[guidlow] or nil
end



-- example:

local function OnChat(event, player, msg, lang, typ, misc)
    if (msg == "store") then
        player:Store()
    end
    if (msg == "remove") then
        player:Remove()
    end
    if (msg == "test") then
        local guid = player:GetGUIDLow()
        CreateLuaEvent(function() print(guid, SafeGetPlayer(guid)) end, 500, 0)
    end
end

RegisterPlayerEvent(18, OnChat)