QDataStream: make qfloat16 streaming a non-member

Remove the member function from the API and re-add it as a hidden
friend on qfloat16, where it will be a complete type.

[ChangeLog][QtCore][Potentially Souce-Incompatible Changes] The
qfloat16 QDataStream operators are now hidden friends and only found
by argument-dependent lookup. Previously, these were member functions
on QDataStream.

Fixes: QTBUG-93499
Pick-to: 6.3
Change-Id: Ib3d4df7a3fe3a9d0938f3be8b70b50fef0416262
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

1 files changed, 37 insertions, 0 deletions

diff --git a/src/corelib/global/qfloat16.cpp b/src/corelib/global/qfloat16.cpp
index 0eb6ec1010..62c87234a2 100644
--- a/src/corelib/global/qfloat16.cpp
+++ b/src/corelib/global/qfloat16.cpp
@@ -42,6 +42,8 @@
 #include "private/qsimd_p.h"
 #include <cmath> // for fpclassify()'s return values
 
+#include <QtCore/qdatastream.h>
+
 QT_BEGIN_NAMESPACE
 
 QT_IMPL_METATYPE_EXTERN(qfloat16)
@@ -394,6 +396,41 @@ Q_CORE_EXPORT void qFloatFromFloat16(float *out, const qfloat16 *in, qsizetype l
         out[i] = float(in[i]);
 }
 
+#ifndef QT_NO_DATASTREAM
+/*!
+    \fn qfloat16::operator<<(QDataStream &ds, qfloat16 f)
+    \relates QDataStream
+    \since 5.9
+
+    Writes a floating point number, \a f, to the stream \a ds using
+    the standard IEEE 754 format. Returns a reference to the stream.
+
+    \note In Qt versions prior to 6.3, this was a member function on
+    QDataStream.
+*/
+QDataStream &operator<<(QDataStream &ds, qfloat16 f)
+{
+    return ds << f.b16;
+}
+
+/*!
+    \fn qfloat16::operator>>(QDataStream &ds, qfloat16 &f)
+    \relates QDataStream
+    \since 5.9
+
+    Reads a floating point number from the stream \a ds into \a f,
+    using the standard IEEE 754 format. Returns a reference to the
+    stream.
+
+    \note In Qt versions prior to 6.3, this was a member function on
+    QDataStream.
+*/
+QDataStream &operator>>(QDataStream &ds, qfloat16 &f)
+{
+    return ds >> f.b16;
+}
+#endif
+
 QT_END_NAMESPACE
 
 #include "qfloat16tables.cpp"