Re: [boost] [1.35] Serialization shared_ptr_132headers cause compilation error with g++ 4.1.0

From: Clif Houck (chouck_at_[hidden])
Date: 2008-03-17 18:09:22

Robert Ramey <ramey <at> rrsd.com> writes:

> 
> Hmmm - there is a test - http://www.rrsd.com/boost/library_status.html
> 
> test_shared_ptr_132_text_archive
> 
> which compiles and runs.  How is this different than your
> situation?  Doe sthe test need to be enhanced?
> 
> Robert Ramey
> 
> Clif Houck wrote:
> > Robert Ramey <ramey <at> rrsd.com> writes:
> >
> >>
> >> I'm not sure about the state of this.  You might try the code at
> >> www.rrsd.com
> >> (1.36) and let me know how that works out.
> >>
> >> Robert Ramey
> >>
> >
> > Simply substituting 1.36 headers from your website for the 1.35 ones,
> > gives me the same errors:
> >
> > g++ what.cc -o what -I /home/chouck/Desktop/BoostZip/ -I
> > /usr/local/include/boost-1_35/  -lboost_serialization-gcc41-mt-1_35
> > /home/chouck/Desktop/BoostZip/boost/serialization/shared_ptr.hpp: In
> > function 'void boost::serialization::load(Archive&,
> > boost::shared_ptr<U>&, unsigned int)':
> > /home/chouck/Desktop/BoostZip/boost/serialization/shared_ptr.hpp:123:
> > error: 'null_deleter' is not a member of 'boost::archive::detail'
> > /home/chouck/Desktop/BoostZip/boost/serialization/shared_ptr.hpp:123:
> > error: 'null_deleter' is not a member of 'boost::archive::detail'
> > /home/chouck/Desktop/BoostZip/boost/serialization/shared_ptr.hpp:123:
> > error: template argument 2 is invalid
> > /home/chouck/Desktop/BoostZip/boost/serialization/shared_ptr.hpp:123:
> > error: expected `>' before '*' token
> > /home/chouck/Desktop/BoostZip/boost/serialization/shared_ptr.hpp:123:
> > error: expected `(' before '*' token
> > /home/chouck/Desktop/BoostZip/boost/serialization/shared_ptr.hpp:124:
> > error: expected primary-expression before '>' token
> > make: *** [all] Error 1
> >
> > So it appears your current headers have the same problem.
> >
> > Clif
> >
> >
> >
> > _______________________________________________
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> 

Well, I figured out what the problem was after diagnosing a little bit further.
Apparently you must include at least one archive header before the shared_ptr
header for correct compilation to occur.

This example:

//This header must come BEFORE the shared_ptr headers
#include <boost/archive/binary_oarchive.hpp>

#include <boost/serialization/shared_ptr_132.hpp>
#include <boost/serialization/shared_ptr.hpp>

int main()
{
    return 0;
}

Was distilled from a larger, but still simple test program I wrote to make sure
that I was writing code correctly to de-serialize 1.32 era shared_ptrs. In that
program I made the mistake of including the archive headers AFTER the shared_ptr
headers.

I was under the impression that the serialization library had dispensed with
header-order dependencies. I guess this isn't the case? Perhaps I didn't read
the documentation closely enough. In any case, order dependencies for headers is
very counter-intuitive and I'm sure a lot of other users have/will run into this
problem. Is there some way to break the dependency?

Clif Houck