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> On Wed, Jun 22, 2011 at 3:10 PM, Roberto Ierusalimschy
> <> wrote:
> > There seems to be another problem with the function approach (assuming
> > an opaque structure). A subtle detail when creating files in Lua is
> > that the creation of the userdata may fail (memory error). So, if the
> > user opens a file and then calls this new function, Lua may raise an
> > error and the open file is lost forever.
> Then make this new function return NULL rather than throwing an error.

For that it would need to enclose the "lua_newuserdata" into a
lua_pcall. It is doable, but the "export structure" approach
seems simpler (does not need lua_pcall) and more flexible (user
may add other fields).

-- Roberto