Introduce Q_PROPERTY attribute REQUIRED

This is meant to correspond to required properties in QML.

Change-Id: I2645981e13f7423bc86b48370c165b3cfe2aaa62
Task-number: QTBUG-81561
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/src/corelib/kernel/qmetaobject.cpp b/src/corelib/kernel/qmetaobject.cpp
index 347fb1eb87..37f5acc5c5 100644
--- a/src/corelib/kernel/qmetaobject.cpp
+++ b/src/corelib/kernel/qmetaobject.cpp
@@ -3573,6 +3573,21 @@ bool QMetaProperty::isFinal() const
 }
 
 /*!
+  \since 5.15
+  Returns \c true if the property is required; otherwise returns \c false.
+
+  A property is final if the \c{Q_PROPERTY()}'s \c REQUIRED attribute
+  is set.
+*/
+bool QMetaProperty::isRequired() const
+{
+    if (!mobj)
+        return false;
+    int flags = mobj->d.data[handle + 2];
+    return flags & Required;
+}
+
+/*!
     \obsolete
 
     Returns \c true if the property is editable for the given \a object;