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

From: Jeff Flinn (TriumphSprint2000_at_[hidden])
Date: 2008-06-20 08:37:02

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?

You could probably use boost.iostream library to create a sink that 
increments a size but doesnt' actually 'write' anything, then pass that 
to the oarchive's constructor. Be sure to use the same oarchive type 
that you will actually write to later.

Jeff