I've forwarded this from comp.lang.c++. The OP has tried the demo.cpp example (I think), and is getting results different from those the demo says are expected. This is related to versioning... but I'm confused as to what should be the result. Jeff -------- Original Message -------- Subject: Re: Saving and reloading a container to/from disk Date: Wed, 31 Mar 2010 13:59:16 +0200 From: jacob navia <jacob@jacob.remcomp.fr> Reply-To: jacob@jspamsink.org Organization: lccwin Newsgroups: comp.lang.c++ References: <4bb2e6b3$0$15818$ba4acef3@reader.news.orange.fr> <81gc4oFua5U6@mid.individual.net> Ian Collins a écrit :

On 03/31/10 07:07 PM, jacob navia wrote:

...

Hi

What would be the best way to save and reload later a container to/from disk in C++?

It depends, there isn't really a best way. Do you want portability?

http://www.boost.org/doc/libs/1_42_0/libs/serialization/doc/index.html

Is a good place to start.

Thanks. I downloaded the boost libraries, and compiled them in my machine. Unziped the source code is 269MB. Compilation took 14 minutes. Machine Mac-pro OS X with 8 CPUs and 12GB RAM. Then, I compiled the example of the serialization. The class being saved/restored looks like this: original schedule 6:24 bob 0x0x100200440 34?135'52.56" 134?22'78.3" 24th Street and 10th Avenue 0x0x1002004d0 35?137'23.456" 133?35'54.12" State street and Cathedral Vista Lane 0x0x100200530 35?136'15.456" 133?32'15.3" White House when restored, the restored stuff looks like this: 6:24 0x0x100200e30 34?135'52.56" 134?22'78.3" 24th Street and 10th Avenue 0x0x100200f40 35?137'23.456" 133?35'54.12" State street and Cathedral Vista Lane 0x0x1002012c0 35?136'15.456" 133?32'15.3" White House As you can see the name "bob" is missing. The same bug appears with all other saved/restored class instances. I am not fluent in C++ to figure out this, sorry. But maybe this is a bug in the example, I can't determine what is the reason. jacob