Re: [ ruby-Bugs-7974 ] anonymous classes share single alloc function

Hi,

At Fri, 19 Jan 2007 03:28:56 +0900,
MenTaL guY (mental) wrote in [ruby-core:09959]:
> Summary: anonymous classes share single alloc function
>
> Initial Comment:
> If you do:
>
>  rb_cA = rb_class_new(rb_cObject);
>  rb_cB = rb_class_new(rb_cObject);
>
>  rb_define_alloc_func(rb_cA, alloc_a);
>  rb_define_alloc_func(rb_cB, alloc_b);
>
> ...then instances of both rb_cA and rb_cB will be allocated using alloc_b.

rb_class_new() creates a Class instance merely, without corresponding
singleton class (or eigenclass), but rb_define_alloc_func() (and
rb_undef_alloc_func()) expect the given class has it.


Index: eval.c
===================================================================
--- eval.c	(revision 11542)
+++ eval.c	(working copy)
@@ -454,5 +454,6 @@ rb_define_alloc_func(klass, func)
 {
     Check_Type(klass, T_CLASS);
-    rb_add_method(CLASS_OF(klass), ID_ALLOCATOR, NEW_CFUNC(func, 0),
NOEX_PRIVATE);
+    rb_add_method(rb_singleton_class(klass), ID_ALLOCATOR, NEW_CFUNC(func, 0),
+		  NOEX_PRIVATE);
 }

@@ -462,5 +463,5 @@ rb_undef_alloc_func(klass)
 {
     Check_Type(klass, T_CLASS);
-    rb_add_method(CLASS_OF(klass), ID_ALLOCATOR, 0, NOEX_UNDEF);
+    rb_add_method(rb_singleton_class(klass), ID_ALLOCATOR, 0, NOEX_UNDEF);
 }



-- 
Nobu Nakada