bool feed(float x, Complex!float[] fftData)
    {
        void processSegment(float[] segment)
        {
            fftData.length = _fftSize; // we do need the delegate context here

            // do stuff with segment and fftData
        }

        // _analyzer.feed takes a void delegate(float[]) as parameter
        // will this line allocate
        return _analyzer.feed(x, &processSegment);
    }