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| author | John Högberg <[email protected]> | 2019-03-06 15:28:30 +0100 |
|---|---|---|
| committer | John Högberg <[email protected]> | 2019-03-07 09:31:16 +0100 |
| commit | f951b3fcc69c195ce04ae1022fa53272cb74f71b (patch) | |
| tree | 781e576d1acc8882eca11c789e0eaedb47387f52 /erts/doc | |
| parent | 31bff2cdb13a6e2032b7f067d037da0520752fc0 (diff) | |
| download | otp-f951b3fcc69c195ce04ae1022fa53272cb74f71b.tar.gz otp-f951b3fcc69c195ce04ae1022fa53272cb74f71b.tar.bz2 otp-f951b3fcc69c195ce04ae1022fa53272cb74f71b.zip | |
erts: Add enif_term_type
This helps avoid long sequences of enif_is_xxx in code that
serializes terms (such as JSON encoders) by letting the user
switch on the type.
Diffstat (limited to 'erts/doc')
| -rw-r--r-- | erts/doc/src/erl_nif.xml | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/erts/doc/src/erl_nif.xml b/erts/doc/src/erl_nif.xml index cc7452bab5..cf1994887a 100644 --- a/erts/doc/src/erl_nif.xml +++ b/erts/doc/src/erl_nif.xml @@ -3369,6 +3369,48 @@ if (retval & ERL_NIF_SELECT_STOP_CALLED) { </func> <func> + <name since="OTP @OTP-15640@"><ret>ErlNifTermType</ret> + <nametext>enif_term_type(ErlNifEnv *env, ERL_NIF_TERM term)</nametext> + </name> + <fsummary>Determine the type of a term.</fsummary> + <desc> + <p>Determines the type of the given term. The term must be an ordinary + Erlang term and not one of the special terms returned by + <seealso marker="#enif_raise_exception"> + <c>enif_raise_exception</c></seealso>, + <seealso marker="#enif_schedule_nif"> + <c>enif_schedule_nif</c></seealso>, or similar.</p> + <p>The following types are defined at the moment:</p> + <taglist> + <tag><c>ERL_NIF_TERM_TYPE_ATOM</c></tag> + <item/> + <tag><c>ERL_NIF_TERM_TYPE_BITSTRING</c></tag> + <item><p>A bitstring or binary</p></item> + <tag><c>ERL_NIF_TERM_TYPE_FLOAT</c></tag> + <item/> + <tag><c>ERL_NIF_TERM_TYPE_FUN</c></tag> + <item/> + <tag><c>ERL_NIF_TERM_TYPE_INTEGER</c></tag> + <item/> + <tag><c>ERL_NIF_TERM_TYPE_LIST</c></tag> + <item><p>A list, empty or not</p></item> + <tag><c>ERL_NIF_TERM_TYPE_MAP</c></tag> + <item/> + <tag><c>ERL_NIF_TERM_TYPE_PID</c></tag> + <item/> + <tag><c>ERL_NIF_TERM_TYPE_PORT</c></tag> + <item/> + <tag><c>ERL_NIF_TERM_TYPE_REFERENCE</c></tag> + <item/> + <tag><c>ERL_NIF_TERM_TYPE_TUPLE</c></tag> + <item/> + </taglist> + <p>Note that new types may be added in the future, so the caller must + be prepared to handle unknown types.</p> + </desc> + </func> + + <func> <name since="OTP R13B04"><ret>int</ret> <nametext>enif_thread_create(char *name,ErlNifTid *tid,void * (*func)(void *),void *args,ErlNifThreadOpts |