    //=============================================================================
    //  MuseScore
    //  Music Composition & Notation
    //
    //  Copyright (C) 2002-2011 Werner Schweer
    //
    //  This program is free software; you can redistribute it and/or modify
    //  it under the terms of the GNU General Public License version 2
    //  as published by the Free Software Foundation and appearing in
    //  the file LICENCE.GPL
    //=============================================================================

    #ifndef __FIFO_H__
    #define __FIFO_H__

    #include <atomic>

    namespace Ms {

    //---------------------------------------------------------
    //   FifoBase
    //    - works only for one reader/writer
    //    - reader writes ridx
    //    - writer writes widx
    //    - reader decrements counter
    //    - writer increments counter
    //    - counter increment/decrement must be atomic
    //---------------------------------------------------------

    class FifoBase {

       protected:
          int ridx;                 // read index
          int widx;                 // write index
          std::atomic<int> counter; // objects in fifo
          int maxCount;

          void push();
          void pop();

       public:
          FifoBase()              { clear(); }
          virtual ~FifoBase()     {}
          void clear();
          int count() const       { return counter; }
          bool empty() const    { return counter == 0; }
          bool isFull() const     { return maxCount == counter; }
          };

    }     // namespace Ms
    #endif

↑ V730 It is possible that not all members of a class are initialized inside the constructor. Consider inspecting: maxCount.