| -----Original Message----- | From: boost-bounces@lists.boost.org | [mailto:boost-bounces@lists.boost.org] On Behalf Of Andras Erdei | Sent: 03 May 2006 21:24 | To: boost@lists.boost.org | Subject: Re: | [boost][serialization]Serialisation/deserialisationoffloating | -point values | | On 5/2/06, Paul A Bristow <pbristow@hetp.u-net.com> wrote: | > | > IMO The real issue here is not whether round-tripping | should work, but that | > input from a long enough decimal digit string should | always give you the nearest floating-point representation. | > | > For float this is true, and for double is almost (but not quite) true. | | [i've only read the abstract below, not the whole article, | | William D. Clinger | How to read floating point numbers accurately Proceedings | of the ACM SIGPLAN 1990 conference on Programming language | design and implementation I've actually read the article! - though I must confess I didn't understand it all ;-( However 'correct' input seems to be achieved by gcc, and by MSVC for float, and almost for double. So I stick to my guess that it is a bug. It shouldn't be a feature IMO. But I don't think there is anything that we should do (except be aware of the potential problem). It is up to Microsoft and/or Dinkumware to do nothing or resolve. Paul --- Paul A Bristow Prizet Farmhouse, Kendal, Cumbria UK LA8 8AB +44 1539561830 & SMS, Mobile +44 7714 330204 & SMS