Re: [Boost-users] [boost.serialization] serialization crash

From: Johan Råde (rade_at_[hidden])
Date: 2006-10-26 13:11:37

Robert Ramey wrote:

> There has been work in trying to make a portable implementation
> of stream input/output of varying types of NaN's.  This has been
> hampered by the fact that the handling of NaN's varies accross
> implementation so it doesn't seem possible to make "transportable"
> archives which can be guarenteed to recover the same type of
> NaN that has been saved.
> 
> For what it's worth, my personal view is that the attempt to
> save an undefined value - be it a NaN, undefined bool or whatever
> should be considered an error and trapped as soon as possible.
> Implementing this would be fairly easy with a custom stream
> facet which can be optionally attached to any stream.  This would
> leave the choice as to what behavior he desires in the hands of the user.
> 
> But no one has been motivated to actually do this so far.

I'm working on such facets still for handling non-finite floating point 
numbers (infinity and NaN).
I have code that works fine for float and double,
but there are still some problems to be resolved for long double.
And yes, the code has a facility for trapping infinity and NaN,
if you so wish.

--Johan