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Diffstat (limited to 'src/corelib/tools/qscopeguard.h')
-rw-r--r-- | src/corelib/tools/qscopeguard.h | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/src/corelib/tools/qscopeguard.h b/src/corelib/tools/qscopeguard.h new file mode 100644 index 0000000000..31100fcabb --- /dev/null +++ b/src/corelib/tools/qscopeguard.h @@ -0,0 +1,96 @@ +/**************************************************************************** +** +** 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> + + +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 // QSCOPEGUARD_H |