More precise constness for topics in mosquitto_subscribe_multiple #3199
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mosquitto_subscribe_multiple and mosquitto_unsubscribe_multiple do not need to change the characters in the list of topics. Make the signature more precise to reflect that. Now works without cast array of const char*, particularly useful for C++ or Rust bindings. Signed-off-by: Niklas Fiekas <niklas.fiekas@backscattering.de>
niklasf
commented
Jan 11, 2025
| @@ -122,7 +122,7 @@ static void my_connect_callback(struct mosquitto *mosq, void *obj, int result, i | |||
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| connack_result = result; | |||
| if(!result){ | |||
| mosquitto_subscribe_multiple(mosq, NULL, cfg.topic_count, cfg.topics, cfg.qos, cfg.sub_opts, cfg.subscribe_props); | |||
| mosquitto_subscribe_multiple(mosq, NULL, cfg.topic_count, (const char* const*)cfg.topics, cfg.qos, cfg.sub_opts, cfg.subscribe_props); | |||
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Unfortunately C (unlike C++) also warns about converions from char** to const char* const*, even though the latter has lower requirements.
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mosquitto_subscribe_multipleandmosquitto_unsubscribe_multipledo not need to change the characters in the list of topics. Make the signature more precise to reflect that.Now works without cast array of
const char*, particularly useful for C++ or Rust bindings.Thank you for contributing your time to the Mosquitto project!
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