Philipp A. Hartmann 3755470f0f BaseReaderHandler: allow overriding of Default() implementation
By adding an optional CRTP template parameter, the BaseReaderHandler
can call the "overridden" `Default()` function from the `Derived`
class.

See https://en.wikipedia.org/wiki/Curiously_recurring_template_pattern
2014-08-11 17:15:07 +02:00
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