LÖVE

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depth = {depth = 0}
depth.__lt = function (left, right)
  if left.depth < right.depth then
    return true
  else
    return false
  end
end

character1 = {}
function character1:new()
  local o = {}
  setmetatable(o,{__index = depth})
  o.dummy1 = 10
  return o
end

character2 = {}
function character2:new()
  local o = {}
  setmetatable(o,{__index = depth})
  o.dummy2 = 'hello'
  return o
end

c1 = character1:new()
c2 = character2:new()

print(c1 < c2)

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setmetatable(o, depth)

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function depth.__lt(left, right)
  return left.depth < right.depth
end

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local Player = { draw = function () ... end }
Player.__index = Player

local newplayer = setmetatable({x=2, y=3}, Player)
-- same functionality as:
local PlayerDefinition = { draw= function () ... end }
local PlayerMT = { __index = PlayerDefinition }

local newplayer = setmetatable({x=2, y=3}, PlayerMT)

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local Depth = {} -- uppercase to indicate this is something you can think of as a "type" - not needed
Depth.__index = Depth

function Depth:__lt( left, right )
  return left.depth < right.depth
end

local Player1 = setmetatable({}, Depth) -- because of this dependenceis will "decend" into Depth
Player1.__index = Player1 -- look in Player1 for methods
function Player1:new(x, y)
  local o = setmetatable({}, Player1)
end
--analogous for Player2