是否可以更改Ruby对象的类？ [英] Is it possible to change the class of a Ruby object?

问题描述

一旦实例化，可以更改Ruby对象的类，例如：

  class A 
 end 
 
 class B 
 end 
 
a = A.new 
 a.class = B 
  
 
 
 
或类似。
 
 
 
（上述代码不会作为类运行，变量）
 
 
 
我知道这是不可取的，有点奇怪，而不是我打算做的，但是可能吗？
 
 
 
这在理论上是可能的，从一个C扩展通过改变给定对象的 klass 指针，但是应该注意，这将是完全实现特定的，不会为立即类型工作（即你肯定不能改变例如fixnum的类），并且可能以各种方式爆炸。
 
Is it possible to change the class of a Ruby object once it has been instantiated, something like:
class A
end

class B
end

a = A.new
a.class = B
or similar.

(the above code does not run as class is a read only variable)

I know this is not advisable, a bit strange, and not something I plan on doing, but is it possible?
解决方案
No, this is not possible from within ruby.

It is theoretically possible from within a C extension by changing the klass pointer of the given object, but it should be noted that this will be completely implementation-specific, will not work for immediate types (i.e. you definitely can't change the class of e.g. a fixnum), and might blow up in various ways.

                        
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