Re: [boost] [wave) experiences

From: Joel de Guzman (joel_at_[hidden])
Date: 2005-12-07 00:16:35

Stefan Seefeld wrote:
> Hartmut Kaiser wrote:
> 
>> 
>>Joel de Guzman wrote:
>>
>>
>>
>>>>Could you point me to this library, please? I'ld like to 
>>>
>>>try to put it into
>>>
>>>
>>>>Wave to support cross compilation and/or configurable 
>>>
>>>precision support.
>>>
>>>IMO, you do not need an arbitrary precision integer. All you
>>>need is a fixed precision integer (64, 128 or 256 bits). That
>>>is a lot faster to operate on. There are lots of such libraries
>>>and it's easy to write one. Surely, you do not need to compute
>>>things like PI to a million decimal places ;-)
>>
>>
>>Do you have something particular in mind?
> 
> 
> gcc uses some special doubleword arithmetic using a pair of values
> for this case.
> FWIW,

Exactly. I remember writing such a class. I'll see if
I can dig it up. Essentially, it is just a fixed array
of N integers. It's quite easy to write one with just a
pair of integers but it's equally straightforward to
generalize that to N integers.

Regards,
-- 
Joel de Guzman
http://www.boost-consulting.com
http://spirit.sf.net