Backport QScopeGuard class.

--HG--
branch : develop

src/libs/vmisc/backport/qscopeguard.h

@@ -0,0 +1,83 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Sérgio Martins <sergio.martins@kdab.com>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://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.LGPL3 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-3.0.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 (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#ifndef QSCOPEGUARD_H
+#define QSCOPEGUARD_H
+#include <QtCore/qglobal.h>
+
+#if QT_VERSION < QT_VERSION_CHECK(5, 12, 0)
+QT_BEGIN_NAMESPACE
+template <typename F> class QScopeGuard;
+template <typename F> QScopeGuard<F> qScopeGuard(F f);
+template <typename F>
+class QScopeGuard
+{
+public:
+    QScopeGuard(QScopeGuard &&other) Q_DECL_NOEXCEPT
+        : m_func(std::move(other.m_func))
+        , m_invoke(other.m_invoke)
+    {
+        other.dismiss();
+    }
+    ~QScopeGuard()
+    {
+        if (m_invoke)
+            m_func();
+    }
+    void dismiss() Q_DECL_NOEXCEPT
+    {
+        m_invoke = false;
+    }
+private:
+    explicit QScopeGuard(F f) Q_DECL_NOEXCEPT
+        : m_func(std::move(f))
+    {
+    }
+    Q_DISABLE_COPY(QScopeGuard)
+    F m_func;
+    bool m_invoke = true;
+    friend QScopeGuard qScopeGuard<F>(F);
+};
+template <typename F>
+QScopeGuard<F> qScopeGuard(F f)
+{
+    return QScopeGuard<F>(std::move(f));
+}
+QT_END_NAMESPACE
+#endif // QT_VERSION < QT_VERSION_CHECK(5, 12, 0)
+#endif // QSCOPEGUARD_H

src/libs/vmisc/vmisc.pri

@@ -42,7 +42,8 @@ HEADERS += \
     $$PWD/qt_dispatch/qt_dispatch.h \
     $$PWD/vdatastreamenum.h \
     $$PWD/vmodifierkey.h \
-    $$PWD/typedef.h
+    $$PWD/typedef.h \
+    $$PWD/backport/qscopeguard.h
 
 # Qt's versions
 # 5.2.0, 5.2.1