Re: [boost] [serialization] using boost::serialization::collection_size_type and backwards compatibility

Subject: Re: [boost] [serialization] using boost::serialization::collection_size_type and backwards compatibility
From: joaquin_at_[hidden]
Date: 2009-09-03 04:47:27

Matthias Troyer escribió:
> On Sep 2, 2009, at 8:15 AM, joaquin_at_[hidden] wrote:
>
>   
>> An observant colleague has noticed that Boost.MultiIndex serialization
>> uses std::size_type instead of the adviced  
>> boost::serialization::collection_size_type:
>>
>> https://svn.boost.org/trac/boost/ticket/3365
>>
>> My question is: if I just change std::size_type with
>> boost::serialization::collection_size_type in Boost.MultiIndex  
>> serialization code,
>> will backwards compatibility be preserved, i.e. will users be able  
>> to load
>> archives saved with the old std::size_type variant? If not, what's  
>> the suggested
>> way to handle this issue?
>>     
>
> The suggested way is to bump the version number of your class and  
> check the archive version when deserializing
>   

In  my particular case I'd have to bump the version number for a class 
*template*.
Is there a documented way to do so, given that BOOST_CLASS_VERSION does
work only for class instances?

Thank you,

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo