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// 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 QSWAP_H
#define QSWAP_H
#include <QtCore/qtconfigmacros.h>
#include <QtCore/qcompilerdetection.h>
#if 0
#pragma qt_class(QtSwap)
#pragma qt_sync_stop_processing
#endif
QT_BEGIN_NAMESPACE
QT_WARNING_PUSH
// warning: noexcept-expression evaluates to 'false' because of a call to 'void swap(..., ...)'
QT_WARNING_DISABLE_GCC("-Wnoexcept")
namespace QtPrivate
{
namespace SwapExceptionTester { // insulate users from the "using std::swap" below
using std::swap; // import std::swap
template <typename T>
void checkSwap(T &t)
noexcept(noexcept(swap(t, t)));
// declared, but not implemented (only to be used in unevaluated contexts (noexcept operator))
}
} // namespace QtPrivate
// Documented in ../tools/qalgorithm.qdoc
template <typename T>
constexpr void qSwap(T &value1, T &value2)
noexcept(noexcept(QtPrivate::SwapExceptionTester::checkSwap(value1)))
{
using std::swap;
swap(value1, value2);
}
// pure compile-time micro-optimization for our own headers, so not documented:
template <typename T>
constexpr inline void qt_ptr_swap(T* &lhs, T* &rhs) noexcept
{
T *tmp = lhs;
lhs = rhs;
rhs = tmp;
}
QT_WARNING_POP
QT_END_NAMESPACE
#endif // QSWAP_H
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