Re: [boost] [serialization] fast array serialization (10x speedup)

From: Robert Ramey (ramey_at_[hidden])
Date: 2005-10-11 16:48:18

Whoops, I didn't see that. It would handle the backward compatibility issue. 
In any case I'd rather just get it over with and move to 64 bits on those 
platforms.  We'll just implement the complete fix in the next version.

Robert Ramey

Matthias Troyer wrote:
> Hi Robert,
>
> Let me just answer a simple point tonight. You'll get my reply to the
> rest of the mail in the morning.
>
>
> On Oct 11, 2005, at 6:45 PM, Robert Ramey wrote:
>>
>>
>>> 3. I had to introduce a new strong typedef in basic_archive.hpp:
>>>
>>> BOOST_STRONG_TYPEDEF(std::size_t, container_size_type)
>>> BOOST_CLASS_IMPLEMENTATION(boost::archive::container_size_type,
>>> primitive_type)
>>
>> I looked at this and right away I noticed that, as written this
>> would make
>> all existing binary archives unreadable.
>
> Have you looked at the following code I proposed to add for the
> binary_iarchives:
>
>     void load_override(container_size_type & t, int){
>         // upto 2G objects
>         unsigned int x;
>         * this->This() >> x;
>         t = container_size_type(x);
>     }
>
> That, and the similar code for the output archives should do the
> trick and keep backward compatibility, or am I mistaken?
>
> However, I fully agree (and actually proposed so myself in the
> original mail to do:
>
>> The real fix for is:
>>
>> a) bump up the library version from 3 to 4
>> b) alter save/load collections to use unsigned int or size_t
>> depending upon the library version.
>
> but I wanted to leave this to you, since this would be a change to
> the binary file format, which I believe should be done by you.
>
> More tomorrow when I'm awake again,
>
> Matthias
>
>
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