[Caml-list] How safe is caml_get_public_method() to check if an object has a method?

[Goswin von Brederlow <goswin-v-b@web.de>]

Hi,

/usr/include/caml/mlvalues.h says:

CAMLextern value caml_get_public_method (value obj, value tag);
/* Called as:
   caml_callback(caml_get_public_method(obj, caml_hash_variant(name)), obj) */
/* caml_get_public_method returns 0 if tag not in the table.
   Note however that tags being hashed, same tag does not necessarily mean
   same method name. */

In QT5 the classes have virtual methods that can be overloaded. I'm
considering allowing the ocaml classes to have methods by the same
name. The C glue would then check if the ocaml class has such a method
and call it. Otherwise the original method from QT5 would be called.

The question now is wether that is save to do? Is it save as long as
the names produce unique hash_variant values? Or are the hash tables
in objects only parts of the bits of the hash_variant and therefore
collide far more often (given a non-existant method name)?


MfG
	Goswin