Prefer nullptr over NULL

Author: cleishm

src/ESP32RotaryEncoder.cpp

@@ -348,10 +348,10 @@ void RotaryEncoder::setEncoderValue( long newValue )
 
 void ARDUINO_ISR_ATTR RotaryEncoder::loop()
 {
-  if( callbackEncoderChanged != NULL && encoderChanged() )
+  if( callbackEncoderChanged != nullptr && encoderChanged() )
     callbackEncoderChanged( getEncoderValue() );
 
-  if( callbackButtonPressed != NULL && buttonPressed() )
+  if( callbackButtonPressed != nullptr && buttonPressed() )
     callbackButtonPressed( buttonPressedDuration );
 }
 

src/ESP32RotaryEncoder.h

@@ -230,8 +230,8 @@ class RotaryEncoder {
     void loop();
 
   private:
-    EncoderCallback callbackEncoderChanged = NULL;
-    ButtonCallback callbackButtonPressed = NULL;
+    EncoderCallback callbackEncoderChanged = nullptr;
+    ButtonCallback callbackButtonPressed = nullptr;
 
     int encoderPinMode = INPUT;
     int buttonPinMode  = INPUT;