Add QMetaMethod::isValid() function

This function provides a proper way of determining whether a function
returned by QMetaObject::method() is valid. (Checking whether
signature() returns a 0 pointer, which e.g. testlib does, is not an
ideal API -- especially given that signature() will soon be removed
and replaced by a function that returns a QByteArray.)

Change-Id: I644f476b09904925f2042945f5d0ad744482b682
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/corelib/kernel/qmetaobject.h b/src/corelib/kernel/qmetaobject.h
index 650369164c..9e51af7556 100644
--- a/src/corelib/kernel/qmetaobject.h
+++ b/src/corelib/kernel/qmetaobject.h
@@ -134,6 +134,8 @@ public:
                       val0, val1, val2, val3, val4, val5, val6, val7, val8, val9);
     }
 
+    inline bool isValid() const { return mobj != 0; }
+
 private:
     const QMetaObject *mobj;
     uint handle;