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// 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 [[nodiscard]] QScopeGuard
{
public:
explicit QScopeGuard(F &&f) noexcept
: m_func(std::move(f))
{
}
explicit QScopeGuard(const F &f) noexcept
: m_func(f)
{
}
QScopeGuard(QScopeGuard &&other) noexcept
: m_func(std::move(other.m_func))
, m_invoke(qExchange(other.m_invoke, false))
{
}
~QScopeGuard() noexcept
{
if (m_invoke)
m_func();
}
void dismiss() noexcept
{
m_invoke = false;
}
private:
Q_DISABLE_COPY(QScopeGuard)
F m_func;
bool m_invoke = true;
};
template <typename F> QScopeGuard(F(&)()) -> QScopeGuard<F(*)()>;
//! [qScopeGuard]
template <typename F>
[[nodiscard]] QScopeGuard<typename std::decay<F>::type> qScopeGuard(F &&f)
{
return QScopeGuard<typename std::decay<F>::type>(std::forward<F>(f));
}
QT_END_NAMESPACE
#endif // QSCOPEGUARD_H
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