Evaluates the watched expression and on success stores the result in value.
This is equivalent to calling [method@Gtk.Expression.evaluate] with the expression and this pointer originally used to create watch.
an empty GValue to be set
TRUE if the expression could be evaluated and value was set
See Implementation
Evaluates the watched expression and on success stores the result in value.
This is equivalent to calling [method@Gtk.Expression.evaluate] with the expression and this pointer originally used to create watch.