Re: [Boost-users] Boost serializer: incomplete type error reported

22 Jun 2006

      Thanks for your advice, Gennaro.

I had to move the following includes to the beginning of the file:

#include 
#include 

I also realised that the following gives the same error of incomplete type:

void
SetOfRules::save(const string &fileName)
// Save into a file
{
    ofstream fout(fileName.c_str());
    boost::archive::text_oarchive oa(fout);
    oa << *this;
    fout.close();
}

I had to use a helper function like this:

void
_save(const SetOfRules &sor, const string &fileName);

void
SetOfRules::save(const string &fileName)
// Save into a file
{
   _save(*this,fileName);
}

void _save(const SetOfRules &sor, const string &fileName)
{
   std::ofstream fout(fileName.c_str());
   boost::archive::text_oarchive oa(fout);
   oa << sor;
   fout.close();
} // save

And similarly to load a class.

Diego
...
...
Hello,
I have an error that is puzzling me. I have defined serialization of
several custom classes, and everything worked perfectly until we've
changed to a new Linux OS and had to reinstall Boost. Now the program
doesn't compile and the error given is:
error: incomplete type
'boost::serialization::extended_type_info_null<SetOfRules>' used in
nested name specifier
I don't really understand why it says there is an incomplete type when
there used to be no errors. The same error happens with all the classes
where I've defined serialization.
I'm not too much into the latest gcc developments (certainly others
will give a more accurate reply) but it looks like a two-phase lookup
issue: at the time your function is parsed SetOfRules is actually
incomplete, but the old gcc version you had didn't diagnose it and
delayed analisys to instantiation time.
This is just my feeling. You might try moving SetOfRules' #include
before.
--Gennaro.
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---------------------------------------------------------------------
Diego MOLLA ALIOD                                 diego@ics.mq.edu.au
Department of Computing               http://www.ics.mq.edu.au/~diego
Macquarie University

Re: [Boost-users] Boost serializer: incomplete type error reported

Diego Molla