Using interrupts in a world of classes and multiple pins

[PieterP]

Although it's generally a bad idea to use interrupts to read buttons, what you're after is possible:

Interrupt in class, ESP32

Not just the signature, f is the wrong type entirely: it is a closure that stores a copy of the this pointer, it cannot be converted to a function pointer. True, but this is not portable beyond Espressif boards. Indeed. Let's say you want to create a class InterruptCounter that simply counts edges using an interrupt (very similar to the Encoder class, but simpler). Such a class would have a private member function incrementCount that is to be called from the ISR: /// Private handler fun…