Github user mattf-horton commented on the issue:
https://github.com/apache/incubator-metron/pull/414
A further comment on multiple optional parameters: C++ allows multiple
optional (defaulted) arguments, and does not support named arguments. The rule
"if a later optional arg is provided, all preceding optional args must also be
provided, even if with trivial values", is exactly what C++ does. It is also
consistent with what Python does when multiple defaulted arguments are provided
positionally instead of as "named arguments" -- altho of course in Python one
probably would use the named args instead.
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