diff options
Diffstat (limited to 'src/corelib/tools/qscopeguard.h')
| -rw-r--r-- | src/corelib/tools/qscopeguard.h | 87 |
1 files changed, 25 insertions, 62 deletions
diff --git a/src/corelib/tools/qscopeguard.h b/src/corelib/tools/qscopeguard.h index 45c3f93da4..9be6634cc8 100644 --- a/src/corelib/tools/qscopeguard.h +++ b/src/corelib/tools/qscopeguard.h @@ -1,71 +1,41 @@ -/**************************************************************************** -** -** 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. -** -** $QT_END_LICENSE$ -** -****************************************************************************/ +// Copyright (C) 2018 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Sérgio Martins <sergio.martins@kdab.com> +// Copyright (C) 2019 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only #ifndef QSCOPEGUARD_H #define QSCOPEGUARD_H #include <QtCore/qglobal.h> +#include <type_traits> +#include <utility> QT_BEGIN_NAMESPACE - -template <typename F> class QScopeGuard; -template <typename F> QScopeGuard<F> qScopeGuard(F f); - template <typename F> -class -#if QT_HAS_CPP_ATTRIBUTE(nodiscard) -// Q_REQUIRED_RESULT can be defined as __warn_unused_result__ or as [[nodiscard]] -// but the 1st one has some limitations for example can be placed only on functions. -Q_REQUIRED_RESULT -#endif -QScopeGuard +class QScopeGuard { public: + Q_NODISCARD_CTOR + explicit QScopeGuard(F &&f) noexcept + : m_func(std::move(f)) + { + } + + Q_NODISCARD_CTOR + explicit QScopeGuard(const F &f) noexcept + : m_func(f) + { + } + + Q_NODISCARD_CTOR QScopeGuard(QScopeGuard &&other) noexcept : m_func(std::move(other.m_func)) - , m_invoke(qExchange(other.m_invoke, false)) + , m_invoke(std::exchange(other.m_invoke, false)) { } - ~QScopeGuard() + ~QScopeGuard() noexcept { if (m_invoke) m_func(); @@ -77,26 +47,19 @@ public: } private: - explicit QScopeGuard(F &&f) 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(*)()>; +//! [qScopeGuard] template <typename F> -#if QT_HAS_CPP_ATTRIBUTE(nodiscard) -Q_REQUIRED_RESULT -#endif -QScopeGuard<F> qScopeGuard(F f) +[[nodiscard]] QScopeGuard<typename std::decay<F>::type> qScopeGuard(F &&f) { - return QScopeGuard<F>(std::move(f)); + return QScopeGuard<typename std::decay<F>::type>(std::forward<F>(f)); } QT_END_NAMESPACE |