[prev in list] [next in list] [prev in thread] [next in thread] 

List:       ruby-talk
Subject:    class_eval(aString) vs class_eval(aBlock)
From:       Gioele Barabucci <ml () gioelebarabucci ! com>
Date:       2006-01-24 12:19:32
Message-ID: 200601241313.55705.ml () gioelebarabucci ! com
[Download RAW message or body]

Hi,

why does class_eval behave differently is you pass a string or a block to it?
This simple test

| class A
|   def test_str; p self.class.class_eval("@@v"); end
|   def test_blk; p self.class.class_eval { @@v }; end
| end
| 
| class B < A
|   def initialize; @@v = "v.B"; end
| end
| 
| B.new.test_str
| B.new.test_blk

gives this (unexpected?) result

| $ ruby ./cv2.rb
| "v.B"
| ./cv2.rb:3:in `test_blk': uninitialized class variable @@v in A (NameError)
|         from ./cv2.rb:3:in `class_eval'
|         from ./cv2.rb:3:in `class_eval'
|         from ./cv2.rb:3:in `test_blk'
|         from ./cv2.rb:11

--
Gioele <dev@gioelebarabucci.com>

[prev in list] [next in list] [prev in thread] [next in thread]