From: Daniel Berger <djberg96@...>
Date: 2006-06-23T02:06:26+09:00
Subject: Re: Using pack/unpack to go from string to address and back to string

nobu@ruby-lang.org wrote:
> Hi,
>
> At Wed, 21 Jun 2006 23:22:17 +0900,
> Berger, Daniel wrote in [ruby-talk:198375]:
>   
>> It was pointed out to me that Ruby uses rb_str_associate and
>> rb_str_associated behind the scenes with regards to pack('p'), but I'm
>> also wondering about addresses for strings that weren't obtained via
>> pack('p*').
>>
>> Or is this simply impossible?
>>     
>
> It's disallowed.  If it were possible, you could get an illegal
> "String."  For instance:
>
>   [1].pack('l').unpack('p*')
>
>   
Would it be possible to make an exception for strings (char pointers)?  
Or is there no way to determine the type of underlying object in time?

Dan