path: root/src/corelib/global/qcompare_impl.h

// Copyright (C) 2020 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only#ifndef QCOMPARE_IMPL_H#define QCOMPARE_IMPL_H#if 0#pragma qt_sync_skip_header_check#pragma qt_sync_stop_processing#endif#include <QtCore/qtconfigmacros.h>#include <QtCore/qcompilerdetection.h>#include <type_traits> QT_BEGIN_NAMESPACE namespace QtPrivate {// [cmp.categories.pre] / 3, but using a safe bool trick// and also rejecting std::nullptr_t (unlike the example)class CompareAgainstLiteralZero {public:using SafeZero =void(CompareAgainstLiteralZero::*)(); Q_IMPLICIT constexprCompareAgainstLiteralZero(SafeZero) noexcept {}template<typename T,std::enable_if_t<std::is_null_pointer_v<T>,bool> =true>CompareAgainstLiteralZero(T) =delete;};}// namespace QtPrivate QT_END_NAMESPACE #endif// QCOMPARE_IMPL_H