Re: [boost] [Serialization]#3118 basic_binary_oarchive.hpp - save_override possible loss of data warnings

Subject: Re: [boost] [Serialization]#3118 basic_binary_oarchive.hpp - save_override possible loss of data warnings
From: David Abrahams (dave_at_[hidden])
Date: 2009-06-03 12:16:30

on Mon Jun 01 2009, "Robert Ramey" <ramey-AT-rrsd.com> wrote:

>> there is still a possibility of a silent loss of data.
>
> This would only be an issue in following cases:
>
> a) A class has more than 255 backward compatible versions.
> b) An archive has more than 64K different classes in it.
>
> It is currently inconcievable to me that such a program
> would ever be written.  Setting the sizes of these
> types to larger values would make every single binary
> archive bigger and slower.

a. Don't underestimate the potential of systems that generate code
   to... generate code ;-), including new versions of a class

b. There are variable-length number formats that would allow you to
   avoid a size increase while still accomodating arbitrarily large
   version numbers.

-- 
Dave Abrahams
BoostPro Computing
http://www.boostpro.com