Add support for function objects in attachInterrupt

[igrr]

Allow something like

attachInterrupt(pin, [](){
    // function body
  }, CHANGE);

and

class MyClass() {
public:
  MyClass(int pin1, int pin2) {
    attachInterrupt(pin1, std::bind(&MyClass::onPinChange, this, pin1), CHANGE);
    attachInterrupt(pin2, std::bind(&MyClass::onPinChange, this, pin2), CHANGE);
  }

protected:
  void onPinChange(int pin) {
    // handler here
  }
};

without breaking usage of attachInterrupt from C code.

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[hreintke]

Like to use this functionality within my application and willing to give it a try creating a PR for this.
Do you already have a basic idea on how you want to have it implemented.
If so, I can base my work on that.

[neu-rah]

i've working on something like this, pin change interrupts with an optional cargo, https://github.com/neu-rah/PCINT

[hreintke]

See #2745

[zenmanenergy]

Wow. Did this ever get into the core? This is a very cool idea.