Test for valid ERL_NIF_TERM

[Sverker Eriksson]

No there is no ERL_NIF_TERM_UNINITIALISED in the erl_nif API.

There is one erts internal called THE_NON_VALUE, which is what is returned by enif_raise_exception and makes enif_is_exception return true.

So it would be possible to introduce, but I'm not sure how to best make it fit in with the existing "exception" value.

If you just want to do something quick and dirty use the value zero. But don't complain if that stops working at some time.

/Sverker, Erlang/OTP
________________________________
From: erlang-questions <erlang-questions-bounces@REDACTED> on behalf of Robert Harris <robert.harris@REDACTED>
Sent: Wednesday, September 22, 2021 12:50 PM
To: erlang-questions@REDACTED Questions <erlang-questions@REDACTED>
Subject: Test for valid ERL_NIF_TERM

Are any values of ERL_NIF_TERM reserved to mean "invalid"? I.e. is
there a blessed equivalent of

ERL_NIF_TERM optional = ERL_NIF_TERM_UNINITIALISED;
.
.
.
if (optional != ERL_NIF_TERM_UNINITIALISED)
do_something(optional)

?

Robert
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