PIDController class (PIDSource/PIDOutput interfaces?)

[Jared Russell]

I was looking at the WPILib codebase and saw that their PIDController class uses the PIDSource and PITOutput interfaces for I/O to/from the control loop. However I was surprised to see that no WPILib classes actually inherit from these interfaces.

Is the intention that I should inherit from PIDSource and PIDOutput as necessary? Ex:

class PIDEncoder : public Encoder, public PIDSource
{
... (override PIDget() here)
};

class PIDJaguar : public Jaguar, public PIDOutput
{
... (override WritePID() here)
};

Or is there some other intended design pattern that I'm not getting?

Thanks