Re: protect a set in c (non-existing elements)

[Tomas Guisasola Gorham <tomas@...>]

	Hi Thijs

> In Lua I would simply protect a set with something like this;
>
> function protect(self)
>  return setmetatable(self, {
>    __index = function(self, key)
>      return rawget(self,key) or error("Key '"..tostring(key).."' not found.",2)
>    end})
> end
>
> local set = protect({ a = 1 , b = 2 })
>
> print(set.a)
> print(set.b)
> print(set.c)  --> error
	I wouldn't call this a "protection", but anyway...

> I have a c module, for which I want to protect the module table itself like this (so a reusable function is not required, just a one-off). What is the recommended way of doing that? Probably someone did this before, but my google-foo failed to deliver. So any pointers to/or examples would be appreciated.
	Module tables are just like any other tables, so why can't you
do the same you showed up here?  Or maybe I've missed something.

	Regards,
		Tomás