| 1 | // Copyright (C) 2020 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Giuseppe D'Angelo <giuseppe.dangelo@kdab.com> |
|---|
| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
|---|
| 3 | |
|---|
| 4 | #ifndef QCOMPARE_IMPL_H |
|---|
| 5 | #define QCOMPARE_IMPL_H |
|---|
| 6 | |
|---|
| 7 | #if 0 |
|---|
| 8 | #pragma qt_sync_skip_header_check |
|---|
| 9 | #pragma qt_sync_stop_processing |
|---|
| 10 | #endif |
|---|
| 11 | |
|---|
| 12 | #include <QtCore/qtconfigmacros.h> |
|---|
| 13 | #include <QtCore/qcompilerdetection.h> |
|---|
| 14 | |
|---|
| 15 | #include <type_traits> |
|---|
| 16 | |
|---|
| 17 | QT_BEGIN_NAMESPACE |
|---|
| 18 | |
|---|
| 19 | namespace QtPrivate { |
|---|
| 20 | |
|---|
| 21 | // [cmp.categories.pre] / 3, but using a safe bool trick |
|---|
| 22 | // and also rejecting std::nullptr_t (unlike the example) |
|---|
| 23 | class CompareAgainstLiteralZero { |
|---|
| 24 | public: |
|---|
| 25 | using SafeZero = void (CompareAgainstLiteralZero::*)(); |
|---|
| 26 | Q_IMPLICIT constexpr CompareAgainstLiteralZero(SafeZero) noexcept {} |
|---|
| 27 | |
|---|
| 28 | template <typename T, std::enable_if_t<std::is_null_pointer_v<T>, bool> = true> |
|---|
| 29 | CompareAgainstLiteralZero(T) = delete; |
|---|
| 30 | }; |
|---|
| 31 | |
|---|
| 32 | } // namespace QtPrivate |
|---|
| 33 | |
|---|
| 34 | QT_END_NAMESPACE |
|---|
| 35 | |
|---|
| 36 | #endif // QCOMPARE_IMPL_H |
|---|
| 37 | |
|---|
