Re: [Boost-users] Unserialize throws an exception

From: Lorenzo Cavallaro (sullivan_at_[hidden])
Date: 2008-01-16 20:18:27

Dear All,

   for some reason I still haven't received Ed msg thru boost-users mailing 
   list, but, anyway, seeing it quoted helped out ;-)

   Basically, I had an old but working serialized model, M, but I made a
   change to the new code base (library) by adding one extra bool (which I
   didn't remember to as it was a very small change) to the serialized class.
   Thus, the new library code failed to unserialize M due to this
   inconsistency. A "fresh" model solved the issue (more or less; it's a
   little bit more complicated than this, but it'd be useless to bother you
   :-)).

   My bad ;-) Thanks! The hint helped a lot!

bye,
Lorenzo

On Wed, Jan 16, 2008 at 09:23:27PM +0100, Johan R?de wrote:
> > Hi Lorenzo,
> > 
> > Under these circumstances:
> > 
> >   1) classes contain float or double members
> >   2a) [intentional] the floats/doubles are used to store
> >       NaN or +/-Inf values
> >   2b) [unintentional] the floats or doubles are un-initialized 
> >      and the memory they use just happens to contain (by 
> >      circumstance) bit patterns for NaN or +/-Inf
> > 
> > serialization to text or XML will "work" (that is, will run without
> > errors) but de-serialization will result in stream errors since:
> > 
> >    double a;
> >    cin >> a;
> > 
> > fails for "NaN", "Inf", etc.
> > 
> > Ed

> 
> If the problem is the presence of infinity and NaN,
> then you can solve the problem by using my Floating Point Utilities library.
> It is available in the vault in folder Math - Numerics.
> You need the facets in the header non_finite_num_facets.hpp.
> 
> It is not accepted into Boost yet, but the code is mature and has been tested
> with more than 20 different operating system / compiler / processor combinations.
> 
> --Johan Råde
> 
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-- 
Lorenzo `Gigi Sullivan' Cavallaro <sullivan_at_[hidden]>
GPG key at http://security.dico.unimi.it/~sullivan/sullivan.asc
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