Re: [Boost-users] Serialization of dynamic data

From: Anders Sundman (anders.sundman_at_[hidden])
Date: 2007-02-01 15:01:41

Great!

Thanks a bunch. This is exactly what I would like to do. Perfect.

// Anders Sundman

Dave Nay skrev:
>  
> 
> -----Original Message-----
> From: Anders Sundman [mailto:anders.sundman_at_[hidden]] 
> Sent: Thursday, February 01, 2007 8:55 AM
> To: boost-users_at_[hidden]
> Subject: [Boost-users] Serialization of dynamic data
> 
> Hi!
> 
> About the boost::serialization library, what is the best way to handle
> dynamic data in classes? Any idéas, suggestions or caveats? I didn't manage
> to find anything about this in the docs.
> 
> <snip>
> 
> What to do with the data pointer?
> 
> Is there any way to determine (in the serialize function) if a serialization
> or "de-serialization" is taking place? And have different behaviours -
> either allocating a new char[x] or copying data to the archive?
> 
> Is there any way to store dynamic data in an archive?
> 
> 
> Hi Anders,
> 
> I had to do exactly this same thing in our application.  Below is a snip of
> code from my archivable class.
> 
> 	// Serializes this object.
> 	friend class boost::serialization::access;
> 
> 	template<class Archive>
> 	void serialize(Archive & ar, const unsigned int version)
> 	{	
> 		ar & m_lId;
> 		ar & m_timestamp;
> 		ar & m_elements;
> 		ar & m_unLength;
> 
> 		if(m_unLength > 0)
> 		{
> 			if (Archive::is_loading::value)
> 			{
> 				m_pData = malloc(m_unLength);
> 			}
> 
> 			ar &
> boost::serialization::make_binary_object(m_pData, m_unLength); 
> 		}
> 	}
> 
> You class will need to keep track of the size of the dynamic data to
> properly create the temporary object.
> 
> This is covered in the serialization documentation under Serialization
> Wrappers.
> http://www.boost.org/libs/serialization/doc/wrappers.html#binaryobjects
> 
> Dave