Joris Van Remoortere created MESOS-2638:
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Summary: Add support for Optional parameters to protobuf handlers
to wrap option fields
Key: MESOS-2638
URL: https://issues.apache.org/jira/browse/MESOS-2638
Project: Mesos
Issue Type: Improvement
Components: libprocess
Reporter: Joris Van Remoortere
We currently don't have a way to install a protobuf handler for an option field
where the handler takes an Optional parameter of the 'option' field in the
protobuf message. The goal is to be able to do:
{code:title=example|borderStyle=solid}
message Person {
required string name = 1;
option uint32_t age = 2;
}
void person(const std::string& name, const Option<uint32_t>& age)
{
if (age.isKnown()) {
...
}
}
install<Person>(person,
&Person::name,
&Person::age);
{code}
We can then use this to test whether the field was provided, as opposed to
capturing a reference to a default constructed value of the the type.
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