| 1 | // Copyright (C) 2018 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Sérgio Martins <sergio.martins@kdab.com> |
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| 2 | // Copyright (C) 2019 The Qt Company Ltd. |
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| 3 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
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| 4 | |
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| 5 | #ifndef QSCOPEGUARD_H |
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| 6 | #define QSCOPEGUARD_H |
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| 7 | |
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| 8 | #include <QtCore/qglobal.h> |
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| 9 | |
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| 10 | #include <type_traits> |
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| 11 | #include <utility> |
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| 12 | |
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| 13 | QT_BEGIN_NAMESPACE |
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| 14 | |
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| 15 | template <typename F> |
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| 16 | class QScopeGuard |
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| 17 | { |
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| 18 | public: |
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| 19 | Q_NODISCARD_CTOR |
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| 20 | explicit QScopeGuard(F &&f) noexcept |
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| 21 | : m_func(std::move(f)) |
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| 22 | { |
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| 23 | } |
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| 24 | |
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| 25 | Q_NODISCARD_CTOR |
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| 26 | explicit QScopeGuard(const F &f) noexcept |
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| 27 | : m_func(f) |
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| 28 | { |
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| 29 | } |
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| 30 | |
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| 31 | Q_NODISCARD_CTOR |
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| 32 | QScopeGuard(QScopeGuard &&other) noexcept |
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| 33 | : m_func(std::move(other.m_func)) |
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| 34 | , m_invoke(std::exchange(other.m_invoke, false)) |
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| 35 | { |
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| 36 | } |
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| 37 | |
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| 38 | ~QScopeGuard() noexcept |
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| 39 | { |
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| 40 | if (m_invoke) |
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| 41 | m_func(); |
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| 42 | } |
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| 43 | |
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| 44 | void dismiss() noexcept |
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| 45 | { |
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| 46 | m_invoke = false; |
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| 47 | } |
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| 48 | |
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| 49 | private: |
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| 50 | Q_DISABLE_COPY(QScopeGuard) |
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| 51 | |
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| 52 | F m_func; |
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| 53 | bool m_invoke = true; |
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| 54 | }; |
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| 55 | |
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| 56 | template <typename F> QScopeGuard(F(&)()) -> QScopeGuard<F(*)()>; |
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| 57 | |
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| 58 | //! [qScopeGuard] |
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| 59 | template <typename F> |
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| 60 | [[nodiscard]] QScopeGuard<typename std::decay<F>::type> qScopeGuard(F &&f) |
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| 61 | { |
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| 62 | return QScopeGuard<typename std::decay<F>::type>(std::forward<F>(f)); |
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| 63 | } |
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| 64 | |
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| 65 | QT_END_NAMESPACE |
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| 66 | |
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| 67 | #endif // QSCOPEGUARD_H |
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| 68 | |
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