[ruby-talk:00596] Re: Bug in Array#clone!

Hi,

In message "[ruby-talk:00595] Re: Bug in Array#clone!"
    on 99/08/10, GOTO Kentaro <[e-mail]> writes:

|>You are right, except one point.  `dup' is value copying method,
|>unlike `clone' it does not have to copy all the information.
|
|Oh, I've never heard that!  Would you tell me more details on the
|defference between `dup' and `clone'?

For example, Array.html says:

    dup

           Returns a newly created array which has the same
           elements to the receiver. clone returns the freezed
           array for the freezed array. On the other hand, dup
           copies the array contents only.

`clone' returns the complete copy (except object id) of the original
object, but dup is not necessarily that complete.  dup for Array,
Hash, and String does only copy their contents; no singleton method,
instance variable, nor freeze flag are copied.

I should explain this more in detail; I changed the documents like:

    dup
           Returns a newly created array which has the same
           elements to the receiver. clone returns the complete
           copy of the original array including freeze status and
           instance variables. On the other hand, dup copies the
           array contents only.

Or should I copy the instance variables for these classes, and leave
documents unchanged?

|Thanks for your quick job. I've gotten "ok" for almost all but `IO':

Oh, I forgot to make a patch for io.c:

--- /tmp/io.c	Tue Aug 10 03:47:15 1999
+++ io.c	Tue Aug 10 00:07:12 1999
@@ -1774,3 +1774,3 @@
     NEWOBJ(obj, struct RFile);
-    OBJSETUP(obj, CLASS_OF(io), T_FILE);
+    CLONESETUP(obj, io);