Add QByteArrayView vs QChar and vs char16_t relational operators

This allows to remove the dummy relational operators from
tst_qstringapisymmetry.

Task-number: QTBUG-108805
Change-Id: I7cb3154d6fcb571cafab6b318806f74bc8300448
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/text/qbytearrayview.h

@@ -347,6 +347,18 @@ private:
     { return compareThreeWay(lhs, QByteArrayView(rhs)); }
     Q_DECLARE_STRONGLY_ORDERED(QByteArrayView, const char *)
 
+    // defined in qstring.cpp
+    static bool
+    comparesEqual(const QByteArrayView &lhs, const QChar &rhs) noexcept;
+    static Qt::strong_ordering
+    compareThreeWay(const QByteArrayView &lhs, const QChar &rhs) noexcept;
+    static bool comparesEqual(const QByteArrayView &lhs, char16_t rhs) noexcept;
+    static Qt::strong_ordering compareThreeWay(const QByteArrayView &lhs, char16_t rhs) noexcept;
+#if !defined(QT_NO_CAST_FROM_ASCII) && !defined(QT_RESTRICTED_CAST_FROM_ASCII)
+    Q_DECLARE_STRONGLY_ORDERED(QByteArrayView, QChar, QT_ASCII_CAST_WARN)
+    Q_DECLARE_STRONGLY_ORDERED(QByteArrayView, char16_t, QT_ASCII_CAST_WARN)
+#endif // !defined(QT_NO_CAST_FROM_ASCII) && !defined(QT_RESTRICTED_CAST_FROM_ASCII)
+
     qsizetype m_size;
     const storage_type *m_data;
 };

src/corelib/text/qstring.cpp

@@ -6707,6 +6707,30 @@ int QString::compare_helper(const QChar *data1, qsizetype length1, const char *d
   \overload compare()
 */
 
+bool QByteArrayView::comparesEqual(const QByteArrayView &lhs, const QChar &rhs) noexcept
+{
+    return QtPrivate::equalStrings(QUtf8StringView(lhs), QStringView(&rhs, 1));
+}
+
+Qt::strong_ordering QByteArrayView::compareThreeWay(const QByteArrayView &lhs,
+                                                    const QChar &rhs) noexcept
+{
+    const int res = QtPrivate::compareStrings(QUtf8StringView(lhs), QStringView(&rhs, 1));
+    return Qt::compareThreeWay(res, 0);
+}
+
+bool QByteArrayView::comparesEqual(const QByteArrayView &lhs, char16_t rhs) noexcept
+{
+    return QtPrivate::equalStrings(QUtf8StringView(lhs), QStringView(&rhs, 1));
+}
+
+Qt::strong_ordering QByteArrayView::compareThreeWay(const QByteArrayView &lhs,
+                                                    char16_t rhs) noexcept
+{
+    const int res = QtPrivate::compareStrings(QUtf8StringView(lhs), QStringView(&rhs, 1));
+    return Qt::compareThreeWay(res, 0);
+}
+
 /*!
     \internal
     \since 6.8

tests/auto/corelib/text/qstringapisymmetry/tst_qstringapisymmetry.cpp

@@ -60,13 +60,9 @@ constexpr bool is_fake_comparator_v = false;
     MAKE_RELOP(>=, A1, A2) \
     /*end*/
 
-MAKE_ALL(QByteArray, QChar)
-MAKE_ALL(QByteArray, char16_t)
-MAKE_ALL(char16_t, QByteArray)
 
 MAKE_ALL(const char*, QChar)
 
-MAKE_ALL(QChar, QByteArray)
 MAKE_ALL(QChar, const char*)
 
 #undef MAKE_ALL