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, 6 insertions, 2 deletions

diff --git a/src/corelib/serialization/qdatastream.h b/src/corelib/serialization/qdatastream.h
index 584de3166a..ac0adc1bf9 100644
--- a/src/corelib/serialization/qdatastream.h
+++ b/src/corelib/serialization/qdatastream.h
@@ -51,7 +51,9 @@
 
 QT_BEGIN_NAMESPACE
 
+#if QT_CORE_REMOVED_SINCE(6, 3)
 class qfloat16;
+#endif
 class QByteArray;
 class QIODevice;
 
@@ -160,8 +162,9 @@ public:
     QDataStream &operator>>(std::nullptr_t &ptr) { ptr = nullptr; return *this; }
 
     QDataStream &operator>>(bool &i);
-    // ### Qt 7: remove the operator or make qfloat16 fully defined, see QTBUG-93499
+#if QT_CORE_REMOVED_SINCE(6, 3)
     QDataStream &operator>>(qfloat16 &f);
+#endif
     QDataStream &operator>>(float &f);
     QDataStream &operator>>(double &f);
     QDataStream &operator>>(char *&str);
@@ -179,8 +182,9 @@ public:
     QDataStream &operator<<(quint64 i);
     QDataStream &operator<<(std::nullptr_t) { return *this; }
     QDataStream &operator<<(bool i);
-    // ### Qt 7: remove the operator or make qfloat16 fully defined, see QTBUG-93499
+#if QT_CORE_REMOVED_SINCE(6, 3)
     QDataStream &operator<<(qfloat16 f);
+#endif
     QDataStream &operator<<(float f);
     QDataStream &operator<<(double f);
     QDataStream &operator<<(const char *str);