Qt变量初始化，为啥要与声明的次序保持一致

Qt变量初始化，为何要与声明的次序保持一致？
VC里没此限制，C++标准也没此要求。Qt却是这样的，这是为何呢？
这搞的经常因这个改来改去的。

C/C++ code

#include <QPainter>#include <QMouseEvent>#define CAPTURE_WIDTH   98#define CAPTURE_HEIGHT  125editPainter::editPainter(QWidget* pParent)    : QWidget(pParent)    , m_pPixmapSource(NULL)    , m_pPixmapCaptured(NULL)    , m_bMousePressed(false)    , m_bDisChangeDir(false)    , m_enAction(NO_ACTION)    , m_eumScaleType(SCALE_FIX){    m_pPixmapCaptured = new QPixmap(CAPTURE_WIDTH, CAPTURE_HEIGHT);    setMouseTracking(true);    m_ptLast = QPoint(0, 0);}void editPainter::setImagePath(QString strPath){    if (NULL != m_pPixmapSource)    {        delete m_pPixmapSource;        m_pPixmapSource = NULL;    }    m_pPixmapSource = new QPixmap();    bool bRet = m_pPixmapSource->load(strPath);    if (bRet)    {        prePaintRect();        capturePixmap();        repaint(); //刷新    }    else    {        if (NULL != m_pPixmapSource)        {            delete m_pPixmapSource;            m_pPixmapSource = NULL;        }    }}