Fix topic name is shown as a pointer rather than string #331
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Motivation
This is an additional fix to #329 because I still observed logs like:
It's because
HandlerBase::topic_
field is protected and could be accessed directly from the derived classes.Motivation
In
HandlerBase
, maketopic_
private and add two methodstopic()
andgetTopicPtr()
to get the reference to the string and the shared pointer.getTopicPtr()
should only be called when being passed toMessageImpl::setTopicName
.