From: Yukihiro Matsumoto <matz@...>
Date: 2011-07-01T22:59:44+09:00
Subject: [ruby-core:37715] [Ruby 1.9 - Bug #4893] Literal Instantiation breaks Object Model


Issue #4893 has been updated by Yukihiro Matsumoto.


Lazaridis Ilias wrote:
> Yukihiro Matsumoto wrote:
> > Introducing a new global status is a very bad idea.  It doesn't work well with threads.  
> 
> All threads share the same (global) instance of the String class object, thus the flag "call_initialize" is naturally global. 

So that means the whole idea of having call_initialize is a very bad idea, from my point of view.
 
> Why do you place the issue again on "reject", instead of awaiting the final implementation?

I ask you to show us a concrete description of you request.  You have shown the basic outline of your idea by a patch, which appeared to be a bad idea.  As a natural consequence, I rejected.  Show me the outline of your so-called "final implementation", by working code, not by words in vain.  Then I will "resurrect" the issue again, I promise.

matz.


----------------------------------------
Bug #4893: Literal Instantiation breaks Object Model
http://redmine.ruby-lang.org/issues/4893

Author: Lazaridis Ilias
Status: Rejected
Priority: Normal
Assignee: Yukihiro Matsumoto
Category: 
Target version: 
ruby -v: 1.9.2


#String2.rb 
class String 
  def initialize(val) 
    self.replace(val) 
    puts object_id 
  end 
  def my_method_test 
    'has method <my_method_test>' 
  end 
end 

# command line 
$ irb 
irb(main):001:0> original = String.new("original") 
=> "original" 
irb(main):002:0> load "String2.rb" 
=> true 
irb(main):003:0> altered = String.new("altered") 
21878604 
=> "altered" 
irb(main):004:0> altered.my_method_test 
=> "has method <my_method_test>" 
irb(main):005:0> literal = "literal" 
=> "literal" 
irb(main):006:0> literal.my_method_test 
=> "has method <my_method_test>" 
irb(main):007:0> 

- 

The initialize method is an integral part of the class String. 
From the moment that "String2.rb" is loaded, the initialize method of 
class String has been validly redefined. 

(The behaviour of the String class within the "irb session" is 
altered) 

The altered initialize method is now an integral part of the class 
String. 

The altered String object behaves as expected (responds to 
"my_method_test, initialized via redefined initialize method). 

The String(Literal) object responds to "my_method_test", but it is was 
not initialized with the redefined initialize method. 

- 

The "Literal Instantiation" calls the original (core-C-level) String 
initialize method instead of the redefined one (user-language-level). 
This *breaks* the object model. 





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