Question

我试图序列化我使用我定义的Pair类的InvertedIndex类，它也是可序列化的。

这是我的invertedIndex代码：

#ifndef INVERTED_IND
#define INVERTED_IND
#include <map> 
#include <string>
#include <vector>
#include "Pair.h"
#include <boost/serialization/access.hpp>
#include <boost/serialization/map.hpp>
#include <boost/serialization/vector.hpp>
#include <boost/serialization/string.hpp>



class invertedIndex
{
    friend class boost::serialization::access;
public:
    std::map<std::string,std::vector<Pair> > m; //term: (docid,freq)


    void updateIndex (std::map<std::string,int>,int); 
    //Updates inverted index given a map(term:freq),int id
    std::map<int,int> queryIndex(std::vector<std::string> terms);
    //queries the inverted index given a list of terms, and returns a map(docID:score)
    invertedIndex chunkIndex(std::vector<std::string> terms);
    //creates an II object with only those terms that are contained in the terms argument
    std::string toString();
    //toString method for debugging
    template<class Archive>
        void serialize(Archive&ar,const unsigned int version)
        {
            ar & m;
        }
private:
    void addTerm(std::string term,std::vector<Pair>);
//add partial result to this inverted index
};

#endif

这是Pair头文件：

 #ifndef PAIR_T
 #define PAIR_T
  #include <boost/serialization/access.hpp>
  #include <boost/serialization/vector.hpp>
  #include <boost/serialization/string.hpp>
  #include <string>
  #include <iostream>
  #include <sstream>



class Pair
{
friend class boost::serialization::access;
public:
    int docID;
    int freq;
    template<class Archive>
        void serialize(Archive &ar,const unsigned int version)
        {
            ar & docID;
            ar & freq;
        }
    Pair(int x, int y);
    Pair(int x);
    std::string toString();
};

#endif

当我尝试编写一个main方法序列化上面的代码时，编译器发出大量错误，说boost / serialization / access.hpp：109 invertedIndex没有名为serialize的成员。

所以我的问题是我不允许直接序列化倒排索引的地图数据成员吗？这是因为它是一个复杂的数据结构，里面有Vector<Pair>吗？

编辑：这里是编译命令和输出

g++ -Wall -g -DBOOST_SYSTEM_NO_DEPRECATED iiTest.cpp Pair.cpp invertedIndex.cpp -o iiTest -lboost_serialization -lboost_system-mt
In file included from Pair.h:4,
                 from invertedIndex.h:6,
                 from iiTest.cpp:1:
/usr/include/boost/serialization/access.hpp: In static member function 'static void boost::serialization::access::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = invertedIndex]':
/usr/include/boost/serialization/serialization.hpp:74:   instantiated from 'void boost::serialization::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = invertedIndex]'
/usr/include/boost/serialization/serialization.hpp:133:   instantiated from 'void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = invertedIndex]'
/usr/include/boost/archive/detail/oserializer.hpp:139:   instantiated from 'void boost::archive::detail::oserializer<Archive, T>::save_object_data(boost::archive::detail::basic_oarchive&, const void*) const [with Archive = boost::archive::text_oarchive, T = invertedIndex]'
/usr/include/boost/archive/detail/oserializer.hpp:96:   instantiated from 'boost::archive::detail::oserializer<boost::archive::text_oarchive, invertedIndex>'
/usr/include/boost/archive/detail/oserializer.hpp:235:   instantiated from 'static void boost::archive::detail::save_non_pointer_type<Archive>::save_standard::invoke(Archive&, const T&) [with T = invertedIndex, Archive = boost::archive::text_oarchive]'
/usr/include/boost/archive/detail/oserializer.hpp:290:   instantiated from 'static void boost::archive::detail::save_non_pointer_type<Archive>::invoke(Archive&, const T&) [with T = invertedIndex, Archive = boost::archive::text_oarchive]'
/usr/include/boost/archive/detail/oserializer.hpp:296:   instantiated from 'static void boost::archive::detail::save_non_pointer_type<Archive>::invoke(Archive&, T&) [with T = invertedIndex, Archive = boost::archive::text_oarchive]'
/usr/include/boost/archive/detail/oserializer.hpp:507:   instantiated from 'void boost::archive::save(Archive&, T&) [with Archive = boost::archive::text_oarchive, T = invertedIndex]'
/usr/include/boost/archive/detail/common_oarchive.hpp:62:   instantiated from 'void boost::archive::detail::common_oarchive<Archive>::save_override(T&, int) [with T = invertedIndex, Archive = boost::archive::text_oarchive]'
/usr/include/boost/archive/basic_text_oarchive.hpp:75:   instantiated from 'void boost::archive::basic_text_oarchive<Archive>::save_override(T&, int) [with T = invertedIndex, Archive = boost::archive::text_oarchive]'
/usr/include/boost/archive/detail/interface_oarchive.hpp:64:   instantiated from 'Archive& boost::archive::detail::interface_oarchive<Archive>::operator<<(T&) [with T = invertedIndex, Archive = boost::archive::text_oarchive]'
iiTest.cpp:34:   instantiated from here
/usr/include/boost/serialization/access.hpp:109: error: 'class invertedIndex' has no member named 'serialize'
/usr/include/boost/serialization/access.hpp: In static member function 'static void boost::serialization::access::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = invertedIndex]':
/usr/include/boost/serialization/serialization.hpp:74:   instantiated from 'void boost::serialization::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = invertedIndex]'
/usr/include/boost/serialization/serialization.hpp:133:   instantiated from 'void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = invertedIndex]'
/usr/include/boost/archive/detail/iserializer.hpp:173:   instantiated from 'void boost::archive::detail::iserializer<Archive, T>::load_object_data(boost::archive::detail::basic_iarchive&, void*, unsigned int) const [with Archive = boost::archive::text_iarchive, T = invertedIndex]'
/usr/include/boost/archive/detail/iserializer.hpp:115:   instantiated from 'boost::archive::detail::iserializer<boost::archive::text_iarchive, invertedIndex>'
/usr/include/boost/archive/detail/iserializer.hpp:363:   instantiated from 'static void boost::archive::detail::load_non_pointer_type<Archive>::load_standard::invoke(Archive&, const T&) [with T = invertedIndex, Archive = boost::archive::text_iarchive]'
/usr/include/boost/archive/detail/iserializer.hpp:415:   instantiated from 'static void boost::archive::detail::load_non_pointer_type<Archive>::invoke(Archive&, T&) [with T = invertedIndex, Archive = boost::archive::text_iarchive]'
/usr/include/boost/archive/detail/iserializer.hpp:554:   instantiated from 'void boost::archive::load(Archive&, T&) [with Archive = boost::archive::text_iarchive, T = invertedIndex]'
/usr/include/boost/archive/detail/common_iarchive.hpp:61:   instantiated from 'void boost::archive::detail::common_iarchive<Archive>::load_override(T&, int) [with T = invertedIndex, Archive = boost::archive::text_iarchive]'
/usr/include/boost/archive/basic_text_iarchive.hpp:62:   instantiated from 'void boost::archive::basic_text_iarchive<Archive>::load_override(T&, int) [with T = invertedIndex, Archive = boost::archive::text_iarchive]'
/usr/include/boost/archive/text_iarchive.hpp:66:   instantiated from 'void boost::archive::text_iarchive_impl<Archive>::load_override(T&, int) [with T = invertedIndex, Archive = boost::archive::text_iarchive]'
/usr/include/boost/archive/detail/interface_iarchive.hpp:61:   instantiated from 'Archive& boost::archive::detail::interface_iarchive<Archive>::operator>>(T&) [with T = invertedIndex, Archive = boost::archive::text_iarchive]'
iiTest.cpp:37:   instantiated from here
/usr/include/boost/serialization/access.hpp:109: error: 'class invertedIndex' has no member named 'serialize'

主要方法的相关部分（iiTest.cpp）：

stringstream ss;
boost::archive::text_oarchive oarch(ss);
oarch << ii; //ii is a previously declared invertedIndex
boost::archive::text_iarchive iarch(ss);
invertedIndex new_map;
iarch >> new_map;
std::cout << new_map.toString() << std::endl;

Answer 1

我没有看到您的代码存在问题。

也许你可以用不同的方式解决你的问题：

<强> Live On Coliru

#include <boost/serialization/access.hpp>
#include <boost/serialization/map.hpp>
#include <boost/serialization/string.hpp>
#include <boost/serialization/vector.hpp>
#include <iostream>
#include <sstream>

class Pair {
    friend class boost::serialization::access;

  public:
    int docID;
    int freq;
    template <class Archive> void serialize(Archive &ar, const unsigned int version) {
        ar &docID;
        ar &freq;
    }
    Pair(int x=0, int y=0) : docID(x), freq(y) {}
    std::string toString();
};

class invertedIndex {
    friend class boost::serialization::access;

  public:
    std::map<std::string, std::vector<Pair> > m; // term: (docid,freq)

    void updateIndex(std::map<std::string, int>, int);             // Updates inverted index given a map(term:freq),int id
    std::map<int, int> queryIndex(std::vector<std::string> terms); // queries the inverted index given a list of terms, and returns a map(docID:score)
    invertedIndex chunkIndex(std::vector<std::string> terms);      // creates an II object with only those terms that are contained in the terms argument
    std::string toString();                                        // toString method for debugging
    template <class Archive> void serialize(Archive &ar, const unsigned int version) { ar &m; }

  private:
    void addTerm(std::string term, std::vector<Pair>);
    // add partial result to this inverted index
};

#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>
int main() {
    std::stringstream ss;
    {
        boost::archive::text_oarchive oa(ss);

        invertedIndex ii;
        oa << ii;
    }

    std::cout << ss.str() << "\n";

    {
        boost::archive::text_iarchive ia(ss);
        invertedIndex ii;
        ia >> ii;
    }
}

成功运行，打印

22 serialization::archive 13 0 0 0 0 0 0

使用用户定义的类

1 个答案: