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#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QDebug>

class WidgetPrivate : public QWidget
{
    Q_OBJECT

    public:
        WidgetPrivate(QWidget *parent = 0);


        void setSource(QString arg);

    signals:
        void created();


    private:
        QString m_source;

    private slots:
        void cr();
};

template<typename Derived>
class Widget : public WidgetPrivate
{
    public:
        Widget(Derived *d,QWidget *parent = 0);


    protected:
        void mousePressEvent(QMouseEvent *);
        virtual void init();
};

class FirstWidget : public Widget<FirstWidget>
{
    public:
        FirstWidget(QWidget *parent = 0);

        void init();
};

class LastWidget : public Widget<LastWidget>
{
    public:
        LastWidget(QWidget *parent = 0);

        void init();
};


#endif // WIDGET_H

#include "widget.h"

WidgetPrivate::WidgetPrivate(QWidget *parent)
    :QWidget(parent)
{
    connect(this,SIGNAL(created()),this,SLOT(cr()));
    emit created();
}

void WidgetPrivate::cr()
{
    qDebug() << "create widget";
}

void WidgetPrivate::setSource(QString arg)
{
    m_source = arg;
}

template<typename Derived>
Widget<Derived>::Widget(Derived *d,QWidget *parent)
    :WidgetPrivate(parent)
{
    qDebug() << Q_FUNC_INFO;
}

template<typename Derived>
void Widget<Derived>::mousePressEvent(QMouseEvent *)
{
    qDebug() << Q_FUNC_INFO;
}

FirstWidget::FirstWidget(QWidget *parent)
    :Widget<FirstWidget>(this,parent)
{
    qDebug() << Q_FUNC_INFO;
}

void FirstWidget::init()
{

}

LastWidget::LastWidget(QWidget *parent)
    :Widget<LastWidget>(this,parent)
{
    qDebug() << Q_FUNC_INFO;
}

void LastWidget::init()
{
    setWindowTitle("Last");
}

#include <QtGui/QApplication>
#include <QWidget>

#include <QDebug>

#include "widget.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    FirstWidget f;
    f.setSource("f");
    f.show();

    LastWidget l;
    l.setSource("l");
    l.show();

    return a.exec();
}

debug/main.o:main.cpp:(.rdata$_ZTV6WidgetI10LastWidgetE[vtable for Widget<LastWidget>]+0xe8): undefined reference to `Widget<LastWidget>::init()'
debug/main.o:main.cpp:(.rdata$_ZTV6WidgetI11FirstWidgetE[vtable for Widget<FirstWidget>]+0xe8): undefined reference to `Widget<FirstWidget>::init()'

template <typename Derived>
BasicWindow<Derived>::BasicWindow(Derived *d,QWidget *parent)
    :BasicWindowPrivate(parent)
{
    #ifndef Q_OS_MAC || Q_OS_MACX || Q_OS_MAC64 || Q_OS_DARWIN || Q_OS_DARWIN64
        m_layout = new QVBoxLayout(this);
        m_layout->setMargin(0);
        m_layout->setSpacing(0);
        m_viewer = new QDeclarativeView(this);
        m_viewer->viewport()->installEventFilter(this);
        m_layout->addWidget(m_viewer);

        m_viewer->setResizeMode(QDeclarativeView::SizeRootObjectToView);
        m_viewer->setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform | QPainter::TextAntialiasing);

        m_viewer->rootContext()->setContextProperty("window",this);
        m_viewer->rootContext()->setContextProperty("core",Core::instance());

        QObject::connect(m_viewer->rootContext()->engine(), SIGNAL(quit()), QCoreApplication::instance(), SLOT(quit()));

        m_viewer->setMouseTracking(true);
    #else
        m_viewer = NULL;
        d->setRoundRect(false);
        d->init();
    #endif

}

template<typename Derived>
class Widget : public WidgetPrivate
{
...
virtual void init() = 0;
...
}