    //=============================================================================
    //  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
    //=============================================================================

    #include "hook.h"
    #include "sym.h"
    #include "chord.h"
    #include "stem.h"
    #include "score.h"

    namespace Ms {

    //---------------------------------------------------------
    //   Hook
    //---------------------------------------------------------

    Hook::Hook(Score* s)
      : Symbol(s)
          {
          setFlag(ElementFlag::MOVABLE, false);
          setZ(int(type()) * 100);
          }

    //---------------------------------------------------------
    //   setHookType
    //---------------------------------------------------------

    void Hook::setHookType(int i)
          {
          _hookType = i;
          switch(i) {
                case 0:    break;
                case 1:    setSym(SymId::flag8thUp);     break;
                case 2:    setSym(SymId::flag16thUp);    break;
                case 3:    setSym(SymId::flag32ndUp);    break;
                case 4:    setSym(SymId::flag64thUp);    break;
                case 5:    setSym(SymId::flag128thUp);   break;
                case 6:    setSym(SymId::flag256thUp);   break;
                case 7:    setSym(SymId::flag512thUp);   break;
                case 8:    setSym(SymId::flag1024thUp);  break;

                case -1:   setSym(SymId::flag8thDown);   break;
                case -2:   setSym(SymId::flag16thDown);  break;
                case -3:   setSym(SymId::flag32ndDown);  break;
                case -4:   setSym(SymId::flag64thDown);  break;
                case -5:   setSym(SymId::flag128thDown); break;
                case -6:   setSym(SymId::flag256thDown); break;
                case -7:   setSym(SymId::flag512thDown); break;
                case -8:   setSym(SymId::flag1024thDown);break;
                default:
                      qDebug("no hook for subtype %d", i);
                      break;
                }
          }

    //---------------------------------------------------------
    //   layout
    //---------------------------------------------------------

    void Hook::layout()
          {
          setbbox(symBbox(_sym));
          }

    //---------------------------------------------------------
    //   draw
    //---------------------------------------------------------

    void Hook::draw(QPainter* painter) const
          {
          // hide if belonging to the second chord of a cross-measure pair
          if (chord() && chord()->crossMeasure() == CrossMeasure::SECOND)
                return;
          Symbol::draw(painter);
          }

    }

↑ V730 Not all members of a class are initialized inside the constructor. Consider inspecting: _hookType.