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Thanks all for your reply.

unfortunately, luaL_testudata() appeared with 5.2 ... and I'm trying to be compatible with 5.1 as well.

So I created a custom wrapper for 5.1

Bye

Laurent
Le mardi 1 mai 2018 à 23:52:19 UTC+2, Javier Guerra Giraldez <javier@guerrag.com> a écrit :


On 1 May 2018 at 22:36, Laurent FAILLIE <l_faillie@yahoo.com> wrote:
> Hello,
>
> Reading example in https://www.lua.org/pil/28.2.html, I guessed that
> luaL_checkudata() only return a NULL pointer if the argument doesn't match
> an user data of the given type.
> But unfortunately, it raise a fatal error :

try luaL_testudata() [1]



[1]:
https://www.lua.org/manual/5.3/manual.html#luaL_testudata