From: justincollins@...
Date: 2007-12-28T14:05:04+09:00
Subject: Re: testing for 64-bit environment

Quoting Rob Biedenharn <Rob@AgileConsultingLLC.com>:

>
> On Dec 27, 2007, at 10:59 PM, Tom Metge wrote:
>
>> in case anyone else is wondering, my solution:
>>
>> arch = `uname -i`
>>
>> tom
>>
>> On Dec 27, 2007, at 8:15 PM, Tom Metge wrote:
>>
>>> subject says it all- anyone know a way to determine if the host   
>>> system is 64-bit?  i need to load a different module for different  
>>>  environments.
>>>
>>> thanks,
>>> tom
>
>
> I only have a 32-bit system to try, but the Pickaxe seems to indicate
> that Fixnum.size is the bytes in the machine representation of a Fixnum.
>
> On my Intel MacBookPro:
>
> irb> Object::PLATFORM
> => "universal-darwin9.0"
> irb> 1.size
> => 4
> irb> (2**30 - 1).class
> => Fixnum
> irb> (2**30 - 1).size
> => 4
> irb> (2**31 - 1).class
> => Bignum
> irb> (2**31 - 1).size
> => 4
> irb> (2**32 - 1).size
> => 4
> irb> (2**33 - 1).size
> => 8
> irb> (2**33 - 1).class
> => Bignum
>
> Note that Fixnum can hold 31 bits (30 + sign bit) and Bignum jumps from
> 4 bytes to 8 bytes.
>
> What do you get for 1.size on a 64-bit platform?
>
> -Rob
>
> Rob Biedenharn		http://agileconsultingllc.com
> Rob@AgileConsultingLLC.com

irb(main):001:0> RUBY_PLATFORM
=> "x86_64-linux"
irb(main):002:0> 1.size
=> 8


-Justin