-----Original Message----- From: boost-bounces@lists.boost.org [mailto:boost-bounces@lists.boost.org] On Behalf Of Robert Ramey Sent: 30 December 2007 16:53 To: boost@lists.boost.org Subject: Re: [boost] A question regarding serialization lib
I would expect that in your test text1.doc would be identical to text2.doc.
UNLESS you have have floats/double in your classes. In general, it cannot be guarenteed that there is a one-to-one correspondence between floatiing point values as represented by binary in ram to text numbers represented as decimal based text. So in this case I would expect text1.doc to not be identical to text2.doc.
The chances of this a very small 1 in 3 values of a very narrow range- and only MS is known to have this problem as the link below shows. The following feedback item you submitted at Microsoft Connect has been updated: Product/Technology - Visual Studio and .NET Framework Feedback ID - 98770 Feedback Title - Decimal digit string input to double may be 1 bit wrong. The following fields or values changed: Field Status changed from [Resolved] to [Closed] To view these changes, click the following link, or paste the link into your web browser: http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?Feedbac... (requires sign-in) Amazingly (to me at least) this is a 'feature' and may not be fixed - despite it looking very much like a simple out-by-1 error. Paul --- Paul A Bristow Prizet Farmhouse, Kendal, Cumbria UK LA8 8AB +44 1539561830 & SMS, Mobile +44 7714 330204 & SMS pbristow@hetp.u-net.com
Arunava Saha wrote:
Dear experts,
I am using boost serialization library to serialize a huge database (has a lot of stl containers, shared pointers etc. ). I have a general question regarding serialization lib of boost. Suppose I have serialized a database in text format (say, text1.doc), cleared the existing database, import the exported one back and re-export (say, text2.doc). Now, should I see any difference between text1.doc and text2.doc? Actually I am seeing some difference. If I shouldn't, can someone point me to the common mistakes one can do for which it differences can take place?
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