Re: [Boost-users] Subject: Serialization, text_Xarchive Why doesn't work?

From: Konstantin Tkachenko (tkachenkok_at_[hidden])
Date: 2006-08-03 11:29:11

It looks as follows:
22 serialization::archive 3 0 0 5.5 1

-------- Original-Nachricht --------
Datum: Thu, 3 Aug 2006 08:14:41 -0700
Von: "Robert Ramey" <ramey_at_[hidden]>
An: boost-users_at_[hidden]
Betreff: Re: [Boost-users] Subject: Serialization,	text_Xarchive Why doesn\'t work?

> Is it possible that m_value is uninitialized?  It is a known
> problem that many compilers can can write uninitialized
> floating/double values to a text stream and then cannot
> read them.  This topic is currently being discussd on
> the developer's list - as it arises all the time.
> 
> Take a look a test_serial.txt with a text editor.
> What does it look like?
> 
> Robert Ramey
> 
> tkachenkok_at_[hidden] wrote:
> > I've tried to write my first application with Boost.Serialization
> > library.
> >
> > Here is the part of code, where the boost::text_iarchive throws an
> > exception "boost::archive::archive_exception" "what():  stream
> > error":
> >
> > [code]
> > enum Origin {
> >     UNKNOWN=0,
> >     MEASURED,
> >     AVERAGE };
> >
> > class OTCValue
> > {
> > friend class boost::serialization::access;
> > template<class Archive>
> > void serialize(Archive & ar, const unsigned int version)
> > {
> > ar & m_value;
> > ar & m_orig;
> > }
> > double m_value;
> > Origin m_orig;
> >         ...
> > };
> >          ...
> > const OTCValue val1=(*loaded.second.begin())->get_row(0)[0];
> > {
> > std::ofstream ofs("test_serial.txt");
> > boost::archive::text_oarchive oa(ofs);
> > oa << val1;
> > }
> > OTCValue val;
> > {
> > std::ifstream ifs("test_serial.txt");
> > boost::archive::text_iarchive ia(ifs);
> > ia >> val; // here is this exceptions thrown
> > }
> >         ...
> > [/code]
> >
> > And here is a little bit different code, which works great:
> >
> > [code]
> > enum Origin {
> >     UNKNOWN=0,
> >     MEASURED,
> >     AVERAGE };
> >
> > class OTCValue
> > {
> > friend class boost::serialization::access;
> > template<class Archive>
> > void serialize(Archive & ar, const unsigned int version)
> > {
> > ar & m_value;
> > ar & m_orig;
> > }
> > double m_value;
> > Origin m_orig;
> >         ...
> > };
> >          ...
> > const OTCValue val1(5.5, MEASURED);
> > {
> > std::ofstream ofs("test_serial.txt");
> > boost::archive::text_oarchive oa(ofs);
> > oa << val1;
> > }
> > OTCValue val;
> > {
> > std::ifstream ifs("test_serial.txt");
> > boost::archive::text_iarchive ia(ifs);
> > ia >> val;
> > }
> >         ...
> > [/code]
> >
> > What is the problem? The construction
> > (*loaded.second.begin())->get_row(0)[0] returns an OTCValue .
> >
> > I have compiled the boost-1.33.1 from the sources (www.boost.org).
> > The project I've made is under KDevelop 3.2.2 (initially consol
> > "Hello World" application)
> >
> > Operating System: SuSe Linux 10.0
> > Compiler: gcc version 4.0.2
> >
> > I hope, that I've gave enouph information. If not, ask what aou need,
> > you are welcome.
> >
> > Best regards,
> > and thanks to all! 
> 
> 
> 
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> Boost-users mailing list
> Boost-users_at_[hidden]
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