QMetaType: add registerType() and qRegisterMetaType(QMetaType)

This also rewrites QMetaType::id() on top of the helper, with the benefit
of calling a member static function, so QMetaType doesn't need to be
spilled onto the stack. In some upcoming changes I need to ensure that
QMetaTypes are registered so they can be found by name and I'd like to
have a dedicated function name for that, instead of calling .id().

Since I needed to add docs for the new function, I've updated for the
old one too.

[ChangeLog][QMetaType] Added QMetaType::registerType() and an overload
of qRegisterMetaType() taking QMetaType (the two functions do the same
thing). These two functions ensure a given QMetaType is registered with
the Qt global registry, so they can be found by name later. Using
qRegisterMetaType<T>() also accomplishes the same thing, but is slightly
better for completely generic code because it will avoid emitting the
registration for built-in types.

Change-Id: I3859764fed084846bcb0fffd170351d606034c22
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/corelib/compat/removed_api.cpp b/src/corelib/compat/removed_api.cpp
index c4fe85f84f..7ffefa027e 100644
--- a/src/corelib/compat/removed_api.cpp
+++ b/src/corelib/compat/removed_api.cpp
@@ -283,6 +283,14 @@ QT_WARNING_POP
 
 #if QT_CORE_REMOVED_SINCE(6, 5)
 
+#include "qmetatype.h"
+
+int QMetaType::idHelper() const
+{
+    Q_ASSERT(d_ptr);
+    return registerHelper(d_ptr);
+}
+
 #include "qxmlstream.h"
 
 QXmlStreamReader::QXmlStreamReader(const QByteArray &data)