Re: [Boost-users] Compile error when serializing an std::map./

From: James Vanns (james.vanns_at_[hidden])
Date: 2008-05-30 09:48:49

If this interests anyone - I figured it out. Basically the ordering of the headers included matters:

Before

#include <boost/serialization/map.hpp>

You must add

#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>

Then it'll work - even if you don't use the archivers until another unit.

Jim

----- Original Message -----
From: "james vanns" <james.vanns_at_[hidden]>
To: boost-users_at_[hidden]
Sent: Friday, 30 May, 2008 11:03:38 AM GMT +00:00 GMT Britain, Ireland, Portugal
Subject: Compile error when serializing an std::map./

Hi all, with Boost 1.3.5 and g++ 4.2.1 on Linux I get the following compile error from one of the Boost headers:

boost/serialization/utility.hpp:48: error: expected template-name before ‘<’ token
boost/serialization/utility.hpp:48: error: expected `{' before ‘<’ token
boost/serialization/utility.hpp:48: error: expected unqualified-id before ‘<’ token
boost/serialization/utility.hpp:50: error: extra ‘;’

I am trying to serialize a map like so:

#include <boost/serialization/map.hpp>

using std::map;

struct Resource {
   enum ID {
      CPU = 0,
      RAM,
      TMP,
      PRMAN
   };

   static const char* const name[];
};

class ResourceSet {
   private:
      typedef uint16_t Tally;
      typedef Resource::ID RID;
      map<RID, Tally> m_resources;
   private:
      friend class boost::serialization::access;

      template<class Archive>
      void serialize (Archive &p_ark, const unsigned int p_version);
};

template<class Archive>
void
ResourceSet::serialize (Archive &p_ark, const unsigned int p_version)
{
    p_ark &  m_resources;
}

So I am wondering why the compiler is spitting out this error? Is this a bug or is this because of the typedefs? Line 48+ from utility.hpp is this:

/// specialization of is_bitwise_serializable for pairs
template <class T, class U>
struct is_bitwise_serializable<std::pair<T,U> >
 : public mpl::and_<is_bitwise_serializable<T>,is_bitwise_serializable<U> >
{
};

} // serialization
} // namespace boost

Regards,

Jim Vanns

-- 
James Vanns
Systems Programmer
Framestore CFC Ltd.
-- 
James Vanns
Systems Programmer
Framestore CFC Ltd.