How to use Interrupt inside class

[anon35827816]

@meteortriangle

I want to write a rotary encoder code

Why? Several excellent libraries are already out there.

@meteortriangle

but i don't know how to use interrupt

Why do you think you need to use an interrupt to read out a rotary? I always just poll them; works fine.

@meteortriangle

how to use interrupt inside the class

The ISR will evidently not be part of the class. So simple answer: you don't.