Serialize stdext::hash_map using boost serialization library

I want to serialize a hash map to a file and de-serialize it later on.

#include <boost/serialization/hash_map.hpp>
#include <boost/filesystem/fstream.hpp>
#include <hash_map>

class A: virtual public B {
 public:
     friend class boost::serialization::access;
     stdext::hash_map<std::string, myClass> myClassHashTable; 
     template <class Archive>
     void serialize(Archive &ar, const unsigned int version)
     {
        ar & myClassHashTable;
     }
};

void A::serializedToDisk()
{
      boost::filesystem::path finalPath(SOME_CONSTANT);
      // code to create  boost::filesystem::ifstream ofs object
      boost::archive::text_oarchive oa(ofs);
      oa << myClassHashTable;
}
void A::restoreFromDisk()
{
     boost::filesystem::path finalPath(SOME_CONSTANT);
    // code to create  boost::filesystem::ifstream ifs object
      boost::archive::text_iarchive ia(ifs);
      ia >> myClassHashTable;
}

But I am getting an error as -

error C2039: 'serialize' : is not a member of 'stdext::hash_map<_Kty,_Ty>'

I searched online for this error but didn't get much help. Also, I checked in my boost installation serialization/hash_map.hpp does have a serialize() function in it. Same code worked for serialization of std::deque. Can anyone tell me how should I change it to make it compile ?

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Serialize stdext::hash_map using boost serialization library

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