CODEWITHSUNDEEP
c++cereal
Jeff
Jeff

Reputation: 2071

Cereal could not find any Output serialization functions

I do not know why I am getting this error when trying to compile. I have tried adding almost all of the types. I am trying to serialize a set of RegDoneEntry's . I know the call to serialize is not here but I can't get beyond just this. The below is updated to reflect recommendations.

The error I get now is

Severity Code Description Project File Line Suppression State Error LNK2001 unresolved external symbol "public: static class std::set,class std::allocator > RegDoneList::mylist" (?mylist@RegDoneList@@2V?$set@VRegDoneEntry@@U?$less@VRegDoneEntry@@@std@@V?$allocator@VRegDoneEntry@@@3@@std@@A) CerealTest CerealTest.obj 1 

#include "stdafx.h"
#include "cereal/archives/binary.hpp"
#include "cereal/types/set.hpp"
#include <sstream>
#include <iostream>
#include <fstream>
#include <string>
#include <set>
#include <stdio.h>
#include "test.h"

RegDoneList myRegDoneList;

int main()
{
    myRegDoneList = RegDoneList();

    myRegDoneList.mylist = std::set<RegDoneEntry>();
    std::ofstream ss("c:\\reg.bin", std::ofstream::binary | 
        std::ofstream::out | std::ofstream::trunc);

    cereal::BinaryOutputArchive oarchive(ss);
    oarchive(myRegDoneList); // Write the data to the archive

}

bool operator<(const RegDoneEntry& lhs, const RegDoneEntry& rhs)
{
    return lhs.rawData < rhs.rawData;
}

And the Header file:

#include "stdafx.h"
#include "cereal/archives/binary.hpp"
#include "cereal/types/memory.hpp"
#include <sstream>
#include <iostream>
#include <fstream>
#include <string>
#include <set>
#include <stdio.h>


class RegDoneEntry
{
public:
    std::string rawData;
    int operation;
    template<class Archive>
    void serialize(Archive & archive)
    {
        // serialize things by passing them to the archive
        archive(rawData, operation);
    }
    friend bool operator< (const RegDoneEntry &left, const RegDoneEntry &right);

};


class RegDoneList
{
public:
    static std::set<RegDoneEntry> mylist;
    template<class Archive>
    void serialize(Archive & archive)
    {
        // serialize things by passing them to the archive
        archive(mylist);
    }
};

Upvotes: 2

Views: 3107

Answers (1)

rafix07
rafix07

Reputation: 20936

Class RegDoneEntry should have serialize method defined too.

struct RegDoneEntry
{
  std::string rawData;
  int operation;

  template<class Archive>
  void serialize (Archive& ) {  //... 
  } 
};

Next, you want to create set of RegDoneEntry objects, but your code will not be compiled without operator< for RegDoneEntry class. You should add also this operator in definition of RegDoneEntry 

struct RegDoneEntry {
   // ...code from above
   bool operator < (const RegDoneEntry& ) const {
       // your comparison
   }
};

And the last thing, you have set as static member, but you didn't define it in source code, so you should add this line too

std::set<RegDoneEntry> RegDoneList::mylist;

Upvotes: 3

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