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Feature #2124
closedValidator: make Face optional
Description
Change ValidatorConfig and ValidatorRegex so that ndn::Face is optional.
Currently, constructors of these types require Face& parameter.
They should be changed to take Face*, so that NFD can use them by passing nullptr.
Whenever the validator wants to express an Interest but the face is nullptr, it should be treated as if the Interest has been timed out.
Old constructors taking Face& shall be marked deprecated, and deleted after this release.
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