Introduce yarpl::single::SingleObserver interface and SingleObserverBase abstract class for easier subclassing

rsocket / rsocket-cpp

C++ implementation of RSocket

http://rsocket.io

Apache License 2.0

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Introduce yarpl::single::SingleObserver interface and SingleObserverBase abstract class for easier subclassing #801

Closed phoad closed 7 years ago

phoad commented 7 years ago

When I tried to extend SingleObserver class in Thrift integration effort, I have had some difficulties because the parent class's functions were not virtual.

Introduce a pure virtual interface yarpl::single::SingleObserver.
Use the interface instead of abstract class for non-void template cases.