instanceOf now uses RTTI and checks its answer.

Next I'll just remove it, but this commit lets me
have something in history such that I can fall back to
check for bugs that might get introduced.

dw/oofawarewidget.cc

@@ -131,7 +131,7 @@ bool OOFAwareWidget::isOOFContainer (Widget *widget, int oofmIndex)
 
    switch (oofmIndex) {
    case OOFM_FLOATS:
-      return widget->instanceOf (OOFAwareWidget::CLASS_ID) &&
+      return widget->instanceOf <OOFAwareWidget>() &&
          (// For floats, only some OOF aware widgets are considered as
           // containers.
           ((OOFAwareWidget*)widget)->isPossibleOOFContainer (OOFM_FLOATS) &&
@@ -145,7 +145,7 @@ bool OOFAwareWidget::isOOFContainer (Widget *widget, int oofmIndex)
            // is also a text block, so possible float container)
            // within a table widget, which is not a suitable float
            // container parent).
-           !(widget->getParent()->instanceOf (OOFAwareWidget::CLASS_ID) &&
+           !(widget->getParent()->instanceOf <OOFAwareWidget>() &&
              ((OOFAwareWidget*)widget->getParent())
                  ->isPossibleOOFContainerParent (OOFM_FLOATS)) ||
            // Inline blocks are containing blocks, too.
@@ -163,7 +163,7 @@ bool OOFAwareWidget::isOOFContainer (Widget *widget, int oofmIndex)
       
    case OOFM_RELATIVE:
    case OOFM_ABSOLUTE:
-      return widget->instanceOf (OOFAwareWidget::CLASS_ID) &&
+      return widget->instanceOf <OOFAwareWidget>() &&
          (widget->getParent() == NULL ||
           OOFAwareWidget::testWidgetPositioned (widget));
 
@@ -192,7 +192,7 @@ void OOFAwareWidget::notifySetParent ()
            widget != NULL && oofContainer[oofmIndex] == NULL;
            widget = widget->getParent ())
          if (isOOFContainer (widget, oofmIndex)) {
-            assert (widget->instanceOf (OOFAwareWidget::CLASS_ID));
+            assert (widget->instanceOf <OOFAwareWidget>());
             oofContainer[oofmIndex] = (OOFAwareWidget*)widget;
          }