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diff --git a/lang/qt/src/job_p.h b/lang/qt/src/job_p.h
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+/*
+    job_p.h
+
+    This file is part of qgpgme, the Qt API binding for gpgme
+    Copyright (c) 2021 g10 Code GmbH
+    Software engineering by Ingo Klöcker <[email protected]>
+
+    QGpgME is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; either version 2 of the
+    License, or (at your option) any later version.
+
+    QGpgME is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+    In addition, as a special exception, the copyright holders give
+    permission to link the code of this program with any edition of
+    the Qt library by Trolltech AS, Norway (or with modified versions
+    of Qt that use the same license as Qt), and distribute linked
+    combinations including the two.  You must obey the GNU General
+    Public License in all respects for all of the code used other than
+    Qt.  If you modify this file, you may extend this exception to
+    your version of the file, but you are not obligated to do so.  If
+    you do not wish to do so, delete this exception statement from
+    your version.
+*/
+
+#ifndef __QGPGME_JOB_P_H__
+#define __QGPGME_JOB_P_H__
+
+#include "job.h"
+
+#include <memory>
+
+namespace QGpgME
+{
+
+// Base class for pimpl classes for Job subclasses
+class JobPrivate
+{
+public:
+    virtual ~JobPrivate() {}
+};
+
+// Setter and getters for the externally stored pimpl instances of jobs
+// BCI: Add a real d-pointer to Job
+void setJobPrivate(const Job *job, std::unique_ptr<JobPrivate> d);
+
+JobPrivate *getJobPrivate(const Job *job);
+
+template <typename T>
+static T *jobPrivate(const Job *job) {
+    auto d = getJobPrivate(job);
+    if (!d) {
+        std::unique_ptr<T> ref{new T};
+        d = ref.get();
+        setJobPrivate(job, std::move(ref));
+    }
+    return dynamic_cast<T *>(d);
+}
+
+}
+
+#endif // __QGPGME_JOB_P_H__