Evaluates the watched expression and on success stores the result in value.
This is equivalent to calling gtk.expression.Expression.evaluate with the expression and this pointer originally used to create watch.
an empty gobject.value.Value to be set
TRUE if the expression could be evaluated and value was set
Evaluates the watched expression and on success stores the result in value.
This is equivalent to calling gtk.expression.Expression.evaluate with the expression and this pointer originally used to create watch.