#include <QtGui/qundostack.h> #ifndef QUNDOSTACK_H #ifndef QT_NO_UNDOSTACK class QUndoStack: public QObject{ /* Some contents are skipped to improve readability */ private: inline struct QUndoStackPrivate const * d_func() const /* ... */ }; #endif // QT_NO_UNDOSTACK #endif // QUNDOSTACK_H