[Boost-users] Serialization: Cannot use name-value-pairs with indirectly serialized maps.

From: Martin Proulx (mproulx_at_[hidden])
Date: 2004-12-09 16:20:43

Hello,

While evaluating the serialization library, I've ran into a problem 
while modifying my code to add name value pairs to the serialized 
objects in order to be able to serialize them to an xml file.

before doing this, everything worked fine, but now that I'm using NVPs, 
I get the following error:

c:\projects\dev_tools\libs\c++\boost_1_32_0\boost\serialization\access.hpp(106): 
error C2039: 'serialize' : is not a member of 'std::map<_Kty,_Ty>'
        with
        [
            _Kty=std::string,
            _Ty=std::string
        ]

I'm using VC 7.1, and a stripped-down but compilable version of the code 
that causes the problem is included at the end of this mail.

I'm really puzzled at this problem as the following modifications to the 
code will have things compile:

-) Comment out only the 'oa << BOOST_SERIALIZATION_NVP(instanceOfB);' line.
-) Comment out only the 'ia >> BOOST_SERIALIZATION_NVP(instanceOfB);' line.
-) Serializing and unserializing directly the instanceOfA object instead.
-) redefining BOOST_SERIALIZATION_NVP to 'BOOST_SERIALIZATION_NVP(x) x'

is this really a bug or am I missing something ?

Thanks!

Martin

------------------------------------------------------------------------

#include <iostream>
#include <fstream>
#include <string>

#include <boost/serialization/map.hpp>

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

using namespace std;

class A
{

private:

    friend class boost::serialization::access;

    template<class Archive>
    void serialize(Archive & ar, const unsigned int /* file_version */) {
        ar & BOOST_SERIALIZATION_NVP(mappedData_);
    }

    map<string, string> mappedData_;
};

class B
{

private:
   
    friend class boost::serialization::access;

    template<class Archive>
    void serialize(Archive & ar, const unsigned int /* file_version */) {
        ar & BOOST_SERIALIZATION_NVP(privateInstanceOfA_);
    }

    A privateInstanceOfA_;
};

int main(void)
{
    A instanceOfA;
    B instanceOfB;

    std::ofstream ofs("test.txt");
    boost::archive::text_oarchive oa(ofs);
    oa << BOOST_SERIALIZATION_NVP(instanceOfB);
   
    std::ifstream ifs("test.txt");
    boost::archive::text_iarchive ia(ifs);
    ia >> BOOST_SERIALIZATION_NVP(instanceOfB);
}

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