| 1 | // Copyright (C) 2020 Klarälvdalens Datakonsult AB, a KDAB Group company, [email protected], author Giuseppe D'Angelo <[email protected]> |
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| 2 | // 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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| 3 | |
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| 4 | #ifndef QCOMPARE_IMPL_H |
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| 5 | #define QCOMPARE_IMPL_H |
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| 6 | |
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| 7 | #if 0 |
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| 8 | #pragma qt_sync_skip_header_check |
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| 9 | #pragma qt_sync_stop_processing |
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| 10 | #endif |
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| 11 | |
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| 12 | #include <QtCore/qtconfigmacros.h> |
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| 13 | #include <QtCore/qcompilerdetection.h> |
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| 14 | |
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| 15 | #include <type_traits> |
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| 16 | |
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| 17 | QT_BEGIN_NAMESPACE |
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| 18 | |
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| 19 | namespace QtPrivate { |
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| 20 | |
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| 21 | // [cmp.categories.pre] / 3, but using a safe bool trick |
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| 22 | // and also rejecting std::nullptr_t (unlike the example) |
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| 23 | class CompareAgainstLiteralZero { |
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| 24 | public: |
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| 25 | using SafeZero = void (CompareAgainstLiteralZero::*)(); |
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| 26 | Q_IMPLICIT constexpr CompareAgainstLiteralZero(SafeZero) noexcept {} |
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| 27 | |
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| 28 | template <typename T, std::enable_if_t<std::is_null_pointer_v<T>, bool> = true> |
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| 29 | CompareAgainstLiteralZero(T) = delete; |
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| 30 | }; |
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| 31 | |
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| 32 | } // namespace QtPrivate |
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| 33 | |
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| 34 | QT_END_NAMESPACE |
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| 35 | |
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| 36 | #endif // QCOMPARE_IMPL_H |
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| 37 | |
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