Vinnie Falco 59bda5d9c6 basic_parser is abstract, not CRTP (API Change): ...

* `basic_parser` now uses pure virtual member functions instead
  of the curiously recurring template pattern.

Actions Required:

* Change uses of the `basic_parser` type to omit the `Derived`
  template parameter

* Classes derived from `basic_parser` no longer need to friend
  the base.

* Virtual functions in the derived class may be marked `override`.

2019-02-23 11:15:59 -08:00

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