    //=============================================================================
    //  MuseScore
    //  Music Composition & Notation
    //
    //  Copyright (C) 2002-2016 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 __LAYOUT_H__
    #define __LAYOUT_H__

    namespace Ms {

    class Segment;
    class Page;

    //---------------------------------------------------------
    //   LayoutContext
    //    temp values used during layout
    //---------------------------------------------------------

    struct LayoutContext {
          Score* score             { 0    };
          bool startWithLongNames  { true };
          bool firstSystem         { true };
          Page* page               { 0 };
          int curPage              { 0 };      // index in Score->page()s
          int tick                 { 0 };
          Fraction sig;

          QList<System*> systemList;          // reusable systems

          System* prevSystem       { 0 };     // used during page layout
          System* curSystem        { 0 };

          MeasureBase* systemOldMeasure;
          bool rangeDone           { false };

          MeasureBase* prevMeasure { 0 };
          MeasureBase* curMeasure  { 0 };
          MeasureBase* nextMeasure { 0 };
          int measureNo            { 0 };
          int endTick;

          void layout();
          int adjustMeasureNo(MeasureBase*);
          void getEmptyPage();
          void collectPage();
          };

    //---------------------------------------------------------
    //   VerticalAlignRange
    //---------------------------------------------------------

    enum class VerticalAlignRange {
          SEGMENT, MEASURE, SYSTEM
          };

    }     // namespace Ms
    #endif

↑ V730 Not all members of a class are initialized inside the compiler generated constructor. Consider inspecting: systemOldMeasure, endTick.