Hi Robert, Let me be more precise on a particular behavior. This looks to me very strange. Suppose, I have a database. I serialized it to a file 1.txt in text mode, deleted the current database, read back the file (1.txt) and serialized again to another file 2.txt. Again, deleted the database, read back 2.txt and serialized to yet another file 3.txt. Repeating the same cycle I created another file 4.txt from the imported database of 3.txt. Now if I compare these files, I see some interesting thing. 1.txt and 3.txt is identical. Similarly 2.txt and 4.txt is identical. But 1.txt and 2.txt is NOT !!!! Do you have any idea in which situation this can take place? If you need any other information please get back to me. FYI, my database don't contain any huge float or double values. There are mostly unsigned integers, but a number of stl containers have been used throughout. Thanks, Arunava. ------------------------------------------------------------------------ ------------------------------------ Date: Sun, 30 Dec 2007 08:52:46 -0800 From: "Robert Ramey" <ramey@rrsd.com> Subject: Re: [boost] A question regarding serialization lib To: boost@lists.boost.org Message-ID: <fl8ics$mdm$1@ger.gmane.org> Hmmmm - a very interesting question I've never considered. All the serialization tests do the following: create a structure, serialize to a file, load the file to a new structure and check for equality. 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. There may be other cases, but that's all that occurs to me right now. Robert Ramey 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?
Thanks in advance,
Arunava.
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