Re: protect a set in c (non-existing elements)
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- Subject: Re: protect a set in c (non-existing elements)
- From: Tomas Guisasola Gorham <tomas@...>
- Date: 2014年2月14日 09:04:00 -0200 (BRST)
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