commit f27df51b02fe68171c9671832f0aa921e05cae63
Author: Mark Glines <mark@glines.org>
Date:   Wed May 27 08:29:10 2009 -0700

    [pmc] Try to make integer.i_add handle subclasses a bit better.

diff --git a/src/pmc/integer.pmc b/src/pmc/integer.pmc
index 4a166e7..31a26ec 100644
--- a/src/pmc/integer.pmc
+++ b/src/pmc/integer.pmc
@@ -428,21 +428,16 @@ Adds C<value> to C<SELF> inplace.
     VTABLE void i_add(PMC *value) {
         const INTVAL type = value->vtable->base_type;
 
-        switch (type) {
-            case enum_class_Integer:
-                STATICSELF.i_add_int(VTABLE_get_integer(INTERP, value));
-                break;
-
-            case enum_class_Complex:
-                pmc_reuse(INTERP, SELF, enum_class_Complex, 0);
-                VTABLE_set_number_native(INTERP, SELF,
-                        SELF.get_integer() + VTABLE_get_number(INTERP, value));
-                break;
-
-            default:
-                VTABLE_set_number_native(INTERP, SELF,
-                        SELF.get_integer() + VTABLE_get_number(INTERP, value));
-                break;
+        if(VTABLE_isa(interp, value, CONST_STRING(interp, "Integer"))) {
+            STATICSELF.i_add_int(VTABLE_get_integer(INTERP, value));
+        } else
+        if(VTABLE_isa(interp, value, CONST_STRING(interp, "Complex"))) {
+            pmc_reuse(INTERP, SELF, enum_class_Complex, 0);
+            VTABLE_set_number_native(INTERP, SELF,
+                    SELF.get_integer() + VTABLE_get_number(INTERP, value));
+        } else {
+            VTABLE_set_number_native(INTERP, SELF,
+                    SELF.get_integer() + VTABLE_get_number(INTERP, value));
         }
     }