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Diffstat (limited to 'src/corelib/tools/qatomicscopedvaluerollback_p.h')
| -rw-r--r-- | src/corelib/tools/qatomicscopedvaluerollback_p.h | 106 |
1 files changed, 0 insertions, 106 deletions
diff --git a/src/corelib/tools/qatomicscopedvaluerollback_p.h b/src/corelib/tools/qatomicscopedvaluerollback_p.h deleted file mode 100644 index a0f088ec45..0000000000 --- a/src/corelib/tools/qatomicscopedvaluerollback_p.h +++ /dev/null @@ -1,106 +0,0 @@ -// Copyright (C) 2022 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 QATOMICSCOPEDVALUEROLLBACK_P_H -#define QATOMICSCOPEDVALUEROLLBACK_P_H - -// -// W A R N I N G -// ------------- -// -// This file is not part of the Qt API. It exists for the convenience -// of qapplication_*.cpp, qwidget*.cpp and qfiledialog.cpp. This header -// file may change from version to version without notice, or even be removed. -// -// We mean it. -// - -#include <QtCore/qglobal.h> -#include <QtCore/qatomic.h> - -#include <atomic> - -QT_BEGIN_NAMESPACE - -template <typename T> -class [[nodiscard]] QAtomicScopedValueRollback -{ - std::atomic<T> &m_atomic; - T m_value; - std::memory_order m_mo; - - Q_DISABLE_COPY_MOVE(QAtomicScopedValueRollback) - - constexpr std::memory_order store_part(std::memory_order mo) noexcept - { - switch (mo) { - case std::memory_order_relaxed: - case std::memory_order_consume: - case std::memory_order_acquire: return std::memory_order_relaxed; - case std::memory_order_release: - case std::memory_order_acq_rel: return std::memory_order_release; - case std::memory_order_seq_cst: return std::memory_order_seq_cst; - } - // GCC 8.x does not tread __builtin_unreachable() as constexpr -#if !defined(Q_CC_GNU_ONLY) || (Q_CC_GNU >= 900) - Q_UNREACHABLE(); -#endif - return std::memory_order_seq_cst; - } -public: - // - // std::atomic: - // - explicit constexpr - QAtomicScopedValueRollback(std::atomic<T> &var, - std::memory_order mo = std::memory_order_seq_cst) - : m_atomic(var), m_value(var.load(mo)), m_mo(mo) {} - - explicit constexpr - QAtomicScopedValueRollback(std::atomic<T> &var, T value, - std::memory_order mo = std::memory_order_seq_cst) - : m_atomic(var), m_value(var.exchange(value, mo)), m_mo(mo) {} - - // - // Q(Basic)AtomicInteger: - // - explicit constexpr - QAtomicScopedValueRollback(QBasicAtomicInteger<T> &var, - std::memory_order mo = std::memory_order_seq_cst) - : QAtomicScopedValueRollback(var._q_value, mo) {} - - explicit constexpr - QAtomicScopedValueRollback(QBasicAtomicInteger<T> &var, T value, - std::memory_order mo = std::memory_order_seq_cst) - : QAtomicScopedValueRollback(var._q_value, value, mo) {} - - // - // Q(Basic)AtomicPointer: - // - explicit constexpr - QAtomicScopedValueRollback(QBasicAtomicPointer<std::remove_pointer_t<T>> &var, - std::memory_order mo = std::memory_order_seq_cst) - : QAtomicScopedValueRollback(var._q_value, mo) {} - - explicit constexpr - QAtomicScopedValueRollback(QBasicAtomicPointer<std::remove_pointer_t<T>> &var, T value, - std::memory_order mo = std::memory_order_seq_cst) - : QAtomicScopedValueRollback(var._q_value, value, mo) {} - -#if __cpp_constexpr >= 201907L - constexpr -#endif - ~QAtomicScopedValueRollback() - { - m_atomic.store(m_value, store_part(m_mo)); - } - - constexpr void commit() - { - m_value = m_atomic.load(m_mo); - } -}; - -QT_END_NAMESPACE - -#endif // QATOMICASCOPEDVALUEROLLBACK_P_H |