Meta example lua

local META = {}
META =
{
    __index = function(tbl, key) return META[key] end,

    x = 0,
    y = 0,

    setX = function(lhs, v) x = v end,
    setY = function(lhs, v) y = v end,
    getX = function(lhs) return x end,
    getY = function(lhs) return y end,

    getDistance = function(lhs, rhs)
        return math.sqrt(math.pow(lhs.x-rhs.x,2) + math.pow(lhs.y-rhs.y,2))
    end
}

function Vector2(x, y)

    local TBL = setmetatable({}, META)

    TBL:setX(x)
    TBL:setY(y)

    return TBL;

end

print("VAL:",Vector2(12,2):getX())
print("VAL:",Vector2(12,2).x)