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