Dynamic AudioInputAnalog/AudioAnalyzeFFT1024/AudioConnection instances

[chris.nz]

Is it possible to allocate new AudioInputAnalog/AudioAnalyzeFFT1024/AudioConnection instances then release them again once finished? I have a C++ class that renders a spectrum analyzer to an LED matrix using FastLED, but I only want to use that functionality a small part of the time, and release the memory otherwise.

If I have something like the following:

  // class fields
  AudioInputAnalog *adc1;
  AudioAnalyzeFFT1024 *fft;
  AudioConnection *patchCord1;

  // in the class constructor:
  AudioMemory(12);
  adc1 = new AudioInputAnalog(A4);
  fft = new AudioAnalyzeFFT1024();
  patchCord1 = new AudioConnection(*adc1, *fft);

  // in the class destructor:
  delete patchCord1;
  delete fft;
  delete adc1;

I get the following warnings:

src\effect\AudioNoise.cpp:23:10: warning: deleting object of polymorphic class type 'AudioAnalyzeFFT1024' which has non-virtual destructor might cause undefined behaviour [-Wdelete-non-virtual-dtor]
delete fft;
^
src\effect\AudioNoise.cpp:24:10: warning: deleting object of polymorphic class type 'AudioInputAnalog' which has non-virtual destructor might cause undefined behaviour [-Wdelete-non-virtual-dtor]
delete adc1;
^

It also makes my program unstable after I have created/destroyed the class a couple of times. Is there a solution, or do I need to keep these objects around for the entire time?

 

[PaulStoffregen]

No, the connection objects must not be destroyed. Other objects hold pointers to them, and currently there's no way to make the rest of the system "forget" a connection.

 

[chris.nz]

Thanks for the very quick reply and for confirming my suspicions. Sounds like it's time for me to do a bit of refactoring of my code to take that into account...