ruby-core

Hi --

Is there any update or more info available on this? It still seems to
be that class << sing_class is Class.


David

On Fri, 11 Jan 2008, Yusuke ENDOH wrote:

> Hi,
>
> 2008/1/3, David A. Black <dblack@rubypal.com>:
>> Hi --
>>
>> On Wed, 2 Jan 2008, Sylvain Joyeux wrote:
>>
>>> In 1.9.0, the singleton of a singleton is Class, while in 1.8 it was a
>>> singleton itself (see below). Is that an intended behaviour just to
>>> make singletons slightly different than real classes, or is it a bug ?
>>>
>>> [~]% irb1.9
>>>>> obj = Object.new
>>> => #<Object:0x3026d420>
>>>>> sing = class << obj; self end
>>> => #<Class:#<Object:0x3026d420>>
>>>>> sing_of_sing = class << sing; self end
>>> => Class
>>>
>>> [~]% irb
>>>>> obj = Object.new
>>> => #<Object:0x301b2940>
>>>>> sing = class << obj; self end
>>> => #<Class:#<Object:0x301b2940>>
>>>>> sing_of_sing = class << sing; self end
>>> => #<Class:#<Class:#<Object:0x301b2940>>>
>>
>> I would think it must be a bug. It makes it impossible to add class
>> methods of a singleton class, which would be an odd limitation. (Maybe
>> not the most frequent use case, but even so.)
>
> I think so, too.  Looks like this change was made at the revision 8068,
> but I cannot understand the rationale from the commit log.
>
>
> $ svn -r8068 log
> ------------------------------------------------------------------------
> r8068 | matz | 2005-03-04 15:47:45 +0900 (Fri, 04 Mar 2005) | 149 lines
>
> * array.c: replace rb_protect_inspect() and rb_inspecting_p() by
>  rb_exec_recursive() in eval.c.
>
> * eval.c (rb_exec_recursive): new function.
>
> * array.c (rb_ary_join): use rb_exec_recursive().
>
> * array.c (rb_ary_inspect, rb_ary_hash): ditto.
>
> * file.c (rb_file_join): ditto.
>
> * hash.c (rb_hash_inspect, rb_hash_to_s, rb_hash_hash): ditto.
>
> * io.c (rb_io_puts): ditto.
>
> * object.c (rb_obj_inspect): ditto
>
> * struct.c (rb_struct_inspect): ditto.
>
> * lib/set.rb (SortedSet::setup): a hack to shut up warning.
>  [ruby-talk:132866]
>
> * lib/time.rb (Time::strptime): add new function.  inspired by
>  [ruby-talk:132815].
>
> * lib/parsedate.rb (ParseDate::strptime): ditto.
>
> * regparse.c: move st_*_strend() functions from st.c.  fixed some
>  potential memory leaks.
>
> * exception error messages updated.  [ruby-core:04497]
>
> * ext/socket/socket.c (Init_socket): add bunch of Socket
>  constants.  Patch from Sam Roberts <sroberts@uniserve.com>.
>  [ruby-core:04409]
>
> * array.c (rb_ary_s_create): no need for negative argc check.
>  [ruby-core:04463]
>
> * array.c (rb_ary_unshift_m): ditto.
>
> * lib/xmlrpc/parser.rb (XMLRPC::FaultException): make it subclass
>  of StandardError class, not Exception class.  [ruby-core:04429]
>
> * parse.y (fcall_gen): lvar(arg) will be evaluated as
>  lvar.call(arg) when lvar is a defined local variable. [new]
>
> * object.c (rb_class_initialize): call inherited method before
>  calling initializing block.
>
> * eval.c (rb_thread_start_1): initialize newly pushed frame.
>
> * lib/open3.rb (Open3::popen3): $? should not be EXIT_FAILURE.
>  fixed: [ruby-core:04444]
>
> * eval.c (is_defined): NODE_IASGN is an assignment.
>
> * ext/readline/readline.c (Readline.readline): use rl_outstream
>  and rl_instream.  [ruby-dev:25699]
>
> * ext/etc/etc.c (Init_etc): sGroup needs HAVE_ST_GR_PASSWD check
>  [ruby-dev:25675]
>
> * misc/ruby-mode.el: [ruby-core:04415]
>
> * lib/rdoc/generators/html_generator.rb: [ruby-core:04412]
>
> * lib/rdoc/generators/ri_generator.rb: ditto.
>
> * struct.c (make_struct): fixed: [ruby-core:04402]
>
> * ext/curses/curses.c (window_color_set): [ruby-core:04393]
>
> * ext/socket/socket.c (Init_socket): SO_REUSEPORT added.
>  [ruby-talk:130092]
>
> * object.c: [ruby-doc:818]
>
> * parse.y (open_args): fix too verbose warnings for the space
>  before argument parentheses.  [ruby-dev:25492]
>
> * parse.y (parser_yylex): ditto.
>
> * parse.y (parser_yylex): the first expression in the parentheses
>  should not be a command.  [ruby-dev:25492]
>
> * lib/irb/context.rb (IRB::Context::initialize): [ruby-core:04330]
>
> * object.c (Init_Object): remove Object#type.  [ruby-core:04335]
>
> * st.c (st_foreach): report success/failure by return value.
>  [ruby-Bugs-1396]
>
> * parse.y: forgot to initialize parser struct.  [ruby-dev:25492]
>
> * parse.y (parser_yylex): no tLABEL on EXPR_BEG.
>  [ruby-talk:127711]
>
> * document updates - [ruby-core:04296], [ruby-core:04301],
>  [ruby-core:04302], [ruby-core:04307]
>
> * dir.c (rb_push_glob): should work for NUL delimited patterns.
>
> * dir.c (rb_glob2): should aware of offset in the pattern.
>
> * string.c (rb_str_new4): should propagate taintedness.
>
> * env.h: rename member names in struct FRAME; last_func -> callee,
>  orig_func -> this_func, last_class -> this_class.
>
> * struct.c (rb_struct_set): use original method name, not callee
>  name, to retrieve member slot.  [ruby-core:04268]
>
> * time.c (time_strftime): protect from format modification from GC
>  finalizers.
>
> * object.c (Init_Object): remove rb_obj_id_obsolete()
>
> * eval.c (rb_mod_define_method): incomplete subclass check.
>  [ruby-dev:25464]
>
> * gc.c (rb_data_object_alloc): klass may be NULL.
>  [ruby-list:40498]
>
> * bignum.c (rb_big_rand): should return positive random number.
>  [ruby-dev:25401]
>
> * bignum.c (rb_big_rand): do not use rb_big_modulo to generate
>  random bignums.  [ruby-dev:25396]
>
> * variable.c (rb_autoload): [ruby-dev:25373]
>
> * eval.c (svalue_to_avalue): [ruby-dev:25366]
>
> * string.c (rb_str_justify): [ruby-dev:25367]
>
> * io.c (rb_f_select): [ruby-dev:25312]
>
> * ext/socket/socket.c (sock_s_getservbyport): [ruby-talk:124072]
>
> * struct.c (make_struct): [ruby-dev:25249]
>
> * dir.c (dir_open_dir): new function.  [ruby-dev:25242]
>
> * io.c (rb_f_open): add type check for return value from to_open.
>
> * lib/pstore.rb (PStore#transaction): Use the empty content when a
>  file is not found.  [ruby-dev:24561]
>
> ------------------------------------------------------------------------
>
> -- 
> Yusuke ENDOH <mame@tsg.ne.jp>
>

--
David A. Black
Director, Ruby Power and Light, LLC
Ruby/Rails training and consulting
http://www.rubypal.com

Thread

Prev Next

In This Thread

Prev Next