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+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt OPC UA module.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API. It exists purely as an
+// implementation detail. This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#ifndef QOPCUAX509UTILS_H
+#define QOPCUAX509UTILS_H
+
+#include <functional>
+#include <QString>
+
+QT_BEGIN_NAMESPACE
+
+template <typename T>
+class Deleter
+{
+public:
+    Deleter(T *data, std::function<void(T *value)> f)
+        : m_data(data)
+        , m_function(f)
+    {
+    }
+    ~Deleter()
+    {
+        if (m_data)
+            m_function(m_data);
+    }
+    void release()
+    {
+        m_data = nullptr;
+        m_function = nullptr;
+    }
+private:
+    T *m_data {nullptr};
+    std::function<void(T *attribute)> m_function;
+};
+
+QString getOpenSslError();
+
+QT_END_NAMESPACE
+
+#endif // QOPCUAX509UTILS_H