szaszm commented on a change in pull request #1040:
URL: https://github.com/apache/nifi-minifi-cpp/pull/1040#discussion_r605665253
##########
File path: extensions/mqtt/processors/AbstractMQTTProcessor.cpp
##########
@@ -85,8 +86,9 @@ void AbstractMQTTProcessor::onSchedule(const
std::shared_ptr<core::ProcessContex
logger_->log_debug("AbstractMQTTProcessor: PassWord [%s]", passWord_);
}
value = "";
- if (context->getProperty(CleanSession.getName(), value) && !value.empty() &&
- org::apache::nifi::minifi::utils::StringUtils::StringToBool(value,
cleanSession_)) {
+ utils::optional<bool> cleanSession_parsed;
+ if (context->getProperty(CleanSession.getName(), value) &&
(cleanSession_parsed =
org::apache::nifi::minifi::utils::StringUtils::toBool(value))) {
+ cleanSession_ = cleanSession_parsed.value();
Review comment:
~Calling `value()` on an empty optional will throw, which is most likely
not what we want here. The assignment should only be attempted when the
optional is not empty.~
Assignment in the condition gives me uneasy feelings. Here's an alternative
involving an [immediately invoked
lambda](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Res-lambda-init)
and the mutable temporary `value`/`property_value` moved to a smaller scope.
100% optional, just an idea.
```suggestion
const auto cleanSession_parsed = [this, &] -> utils::optional<bool> {
std::string property_value;
if (!context->getProperty(CleanSession.getName(), value)) return
utils::nullopt;
return utils::StringUtils::toBool(property_value);
}();
if (cleanSession_parsed) {
cleanSession_ = *cleanSession_parsed;
```
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