QLocale: add toString(Q(Date|QTime)+, QStringView format) overloads

While at it, change the interface of qt_repeatCount() to just take
a single QStringView, since QStringView::mid() is so cheap. Add some
\internal docs.

[ChangeLog][QtCore][QLocale] Added toString(QDate/QTime/QDateTime)
overloads taking the format string as a QStringView.

Change-Id: Ic078796677a6db06227c8a3e276dbdb1039ceead
Reviewed-by: Anton Kudryavtsev <antkudr@mail.ru>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

1 files changed, 8 insertions, 2 deletions

diff --git a/src/corelib/tools/qlocale.h b/src/corelib/tools/qlocale.h
index 1f20bcd241..f9482a7e3a 100644
--- a/src/corelib/tools/qlocale.h
+++ b/src/corelib/tools/qlocale.h
@@ -972,12 +972,18 @@ public:
     inline QString toString(uint i) const;
     QString toString(double i, char f = 'g', int prec = 6) const;
     inline QString toString(float i, char f = 'g', int prec = 6) const;
+
+#if QT_STRINGVIEW_LEVEL < 2
     QString toString(const QDate &date, const QString &formatStr) const;
-    QString toString(const QDate &date, FormatType format = LongFormat) const;
     QString toString(const QTime &time, const QString &formatStr) const;
+    QString toString(const QDateTime &dateTime, const QString &format) const;
+#endif
+    QString toString(const QDate &date, QStringView formatStr) const;
+    QString toString(const QTime &time, QStringView formatStr) const;
+    QString toString(const QDateTime &dateTime, QStringView format) const;
+    QString toString(const QDate &date, FormatType format = LongFormat) const;
     QString toString(const QTime &time, FormatType format = LongFormat) const;
     QString toString(const QDateTime &dateTime, FormatType format = LongFormat) const;
-    QString toString(const QDateTime &dateTime, const QString &format) const;
 
     QString dateFormat(FormatType format = LongFormat) const;
     QString timeFormat(FormatType format = LongFormat) const;