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

From: Ioannis Papadopoulos (ipapadop_at_[hidden])
Date: 2008-06-22 22:58:49

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?
> 

Yeah, I know it. I need it to serialize in a preallocated piece of 
memory and that's the only effective way.