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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


Le mardi 1 mai 2018 à 23:52:19 UTC+2, Javier Guerra Giraldez <> a écrit :

On 1 May 2018 at 22:36, Laurent FAILLIE <> wrote:
> Hello,
> Reading example in, 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]