martinzink commented on code in PR #2148:
URL: https://github.com/apache/nifi-minifi-cpp/pull/2148#discussion_r3008229315


##########
extensions/mqtt/processors/ConsumeMQTT.cpp:
##########
@@ -163,21 +163,21 @@ std::queue<ConsumeMQTT::SmartMessage> 
ConsumeMQTT::getReceivedMqttMessages() {
   return msg_queue;
 }
 
-int64_t ConsumeMQTT::WriteCallback::operator() (const 
std::shared_ptr<io::OutputStream>& stream) {
+io::IoResult ConsumeMQTT::WriteCallback::operator() (const 
std::shared_ptr<io::OutputStream>& stream) {
   if (message_.contents->payloadlen < 0) {
     success_status_ = false;
     logger_->log_error("Payload length of message is negative, value is [{}]", 
message_.contents->payloadlen);
-    return -1;
+    return io::IoResult::error();
   }
 
-  const auto len = 
stream->write(reinterpret_cast<uint8_t*>(message_.contents->payload), 
gsl::narrow<size_t>(message_.contents->payloadlen));
+  const size_t len = 
stream->write(reinterpret_cast<uint8_t*>(message_.contents->payload), 
gsl::narrow<size_t>(message_.contents->payloadlen));
   if (io::isError(len)) {
     success_status_ = false;
     logger_->log_error("Stream writing error when processing message");
-    return -1;
+    return io::IoResult::error();
   }
 
-  return gsl::narrow<int64_t>(len);
+  return io::IoResult::fromSizeT(gsl::narrow<int64_t>(len));

Review Comment:
   fixed 
https://github.com/apache/nifi-minifi-cpp/pull/2148/changes/d0cc52597cee192b10d9f46d08340029f6a8c6d5#diff-bcdc140bec3984114489502b01dfea7dd83390b110643ce0ebd3aefbb81d6badR180



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