QDebug: add op<<(QStringView)

[ChangeLog][QtCore][QDebug] Added streaming of QStringViews.

Change-Id: Id81fae223b60188d541b255b67bc316f9f1b6bef
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

2 files changed, 18 insertions, 0 deletions

diff --git a/src/corelib/io/qdebug.cpp b/src/corelib/io/qdebug.cpp
index be33ec2d23..341400fd93 100644
--- a/src/corelib/io/qdebug.cpp
+++ b/src/corelib/io/qdebug.cpp
@@ -648,6 +648,21 @@ QDebug &QDebug::resetFormat()
 */
 
 /*!
+    \since 5.10
+    \fn QDebug &QDebug::operator<<(QStringView s)
+
+    Writes the string view, \a s, to the stream and returns a reference to the
+    stream. Normally, QDebug prints the string inside quotes and transforms
+    non-printable characters to their Unicode values (\\u1234).
+
+    To print non-printable characters without transformation, enable the
+    noquote() functionality. Note that some QDebug backends might not be 8-bit
+    clean.
+
+    See the QString overload for examples.
+*/
+
+/*!
     \fn QDebug &QDebug::operator<<(QLatin1String s)
 
     Writes the string, \a s, to the stream and returns a reference to the
diff --git a/src/corelib/io/qdebug.h b/src/corelib/io/qdebug.h
index 61059dd694..d5f32a6efd 100644
--- a/src/corelib/io/qdebug.h
+++ b/src/corelib/io/qdebug.h
@@ -151,8 +151,11 @@ public:
     inline QDebug &operator<<(float t) { stream->ts << t; return maybeSpace(); }
     inline QDebug &operator<<(double t) { stream->ts << t; return maybeSpace(); }
     inline QDebug &operator<<(const char* t) { stream->ts << QString::fromUtf8(t); return maybeSpace(); }
+#if QT_STRINGVIEW_LEVEL < 2
     inline QDebug &operator<<(const QString & t) { putString(t.constData(), uint(t.length())); return maybeSpace(); }
     inline QDebug &operator<<(const QStringRef & t) { putString(t.constData(), uint(t.length())); return maybeSpace(); }
+#endif
+    inline QDebug &operator<<(QStringView s) { putString(s.data(), size_t(s.size())); return maybeSpace(); }
     inline QDebug &operator<<(QLatin1String t) { putByteArray(t.latin1(), t.size(), ContainsLatin1); return maybeSpace(); }
     inline QDebug &operator<<(const QByteArray & t) { putByteArray(t.constData(), t.size(), ContainsBinary); return maybeSpace(); }
     inline QDebug &operator<<(const void * t) { stream->ts << t; return maybeSpace(); }