Re: [Boost-users] Boost.Serialization and size of archive

From: Sohail Somani (sohail_at_[hidden])
Date: 2008-06-22 21:07:08

David Abrahams wrote:
> Sohail Somani wrote:
>> Ioannis Papadopoulos wrote:
>>> Hi,
>>>
>>> Is there any means of obtaining how big my archive will be before
>>> actually serializing? Something like a special boost::archive that
>>> will count the size of what I'm serializing. I'm mainly concerned on
>>> allocating exactly the space I'll be needing for binary_oarchives.
>>>
>>> I guess I should follow the SA concept (since I'm trying to find the
>>> size before saving) but how can I know any extra overhead?
>> As others have mentioned, the only real way to do this is to effectively
>> serialize twice. Once to count, once to do the the actual serialization.
>>
>> Out of curiosity, why do you need to do this?
> 
> FWIW, I used to use that tack when I needed a progress bar for long file
> save operations.  Worked a treat.

Who would have thought? An accurate progress bar! Crazy talk. Nice 
application though!

-- 
Sohail Somani
http://uint32t.blogspot.com