#!/usr/bin/lua
local point= require "point"

local print_r= function(table)
    for key,value in pairs(table) do
        io.write("[", key, "] = ", tostring(value), "\n")
    end
end

local p= point.new_Point(3,4)
--p.x= 8     --> Write access throws an error
--print(p.y) --> Read access throws an error
print(p:tostring()) --> [3|4]
print_r(p)          --> prints nothing