如何序列化boost::interprocess::containers::vector

Question

我想使用带有boost::interprocess::containers::vector的boost serilaization

vector的序列化可以很好地工作，因为它包含

#include <boost/interprocess/containers/vector.hpp>

但是我有一个包含共享向量的类

class MyClass {
  public:
    typedef boost::interprocess::allocator<double, SegmentManager> Allocator;
    typedef boost::interprocess::vector<double, Allocator > VectorDouble;
    VectorDouble *pVar;

    template<class archive>  
    void serialize ( archive &ar, const unsigned int version ) {
        using boost::serialization::make_nvp;
        ar & make_nvp ( "data", *pVar; );  # This does not work
        # what works it creating a std::vector and copy the data
    }
...
    MyClass(){
      # creating the shared memory and the pointer ot pVarß
    }

    ~MyClass(){
      # release data
    }
}

我得到了一个错误：

error: ‘class boost::container::vector<double, boost::interprocess::allocator<double, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0u>, boost::interprocess::iset_index> > >’ has no member named ‘serialize’

Answer 1

根据这个头文件，我编写了下面的头文件，它允许进程间向量的序列化。更多细节可以在my github repo中找到。

问候马库斯

#ifndef SHMFW_SERIALIZATION_INTERPROCESS_VECTOR_HPP
#define SHMFW_SERIALIZATION_INTERPROCESS_VECTOR_HPP


#include <boost/serialization/vector.hpp>
#include <boost/interprocess/containers/vector.hpp>

namespace boost { 
namespace serialization {

template<class Archive, class U, class Allocator>

inline void save(
    Archive & ar,
    const boost::interprocess::vector<U, Allocator> &t,
    const unsigned int file_version
){
    boost::serialization::stl::save_collection<Archive, boost::interprocess::vector<U, Allocator> >(
        ar, t
    );
}

template<class Archive, class U, class Allocator>
inline void load(
    Archive & ar,
    boost::interprocess::vector<U, Allocator> &t,
    const unsigned int file_version
){
#ifdef BOOST_SERIALIZATION_VECTOR_135_HPP
    if (ar.get_library_version()==boost::archive::library_version_type(5))
    {
      load(ar,t,file_version, boost::is_arithmetic<U>());
      return;
    }
#endif
    boost::serialization::stl::load_collection<
        Archive,
        boost::interprocess::vector<U, Allocator>,
        boost::serialization::stl::archive_input_seq<
            Archive, boost::interprocess::vector<U, Allocator> 
        >,
        boost::serialization::stl::reserve_imp<boost::interprocess::vector<U, Allocator> >
    >(ar, t);
}

// split non-intrusive serialization function member into separate
// non intrusive save/load member functions
template<class Archive, class U, class Allocator>
inline void serialize(
    Archive & ar,
    boost::interprocess::vector<U, Allocator> & t,
    const unsigned int file_version
){
    boost::serialization::split_free(ar, t, file_version);
}

#if ! BOOST_WORKAROUND(BOOST_MSVC, <= 1300)

/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
// vector<bool>
template<class Archive, class Allocator>
inline void save(
    Archive & ar,
    const boost::interprocess::vector<bool, Allocator> &t,
    const unsigned int /* file_version */
){
    // record number of elements
    collection_size_type count (t.size());
    ar << BOOST_SERIALIZATION_NVP(count);
    boost::interprocess::vector<bool>::const_iterator it = t.begin();
    while(count-- > 0){
        bool tb = *it++;
        ar << boost::serialization::make_nvp("item", tb);
    }
}

template<class Archive, class Allocator>
inline void load(
    Archive & ar,
    boost::interprocess::vector<bool, Allocator> &t,
    const unsigned int /* file_version */
){
    // retrieve number of elements
    collection_size_type count;
    ar >> BOOST_SERIALIZATION_NVP(count);
    t.clear();
    while(count-- > 0){
        bool i;
        ar >> boost::serialization::make_nvp("item", i);
        t.push_back(i);
    }
}

// split non-intrusive serialization function member into separate
// non intrusive save/load member functions
template<class Archive, class Allocator>
inline void serialize(
    Archive & ar,
    boost::interprocess::vector<bool, Allocator> & t,
    const unsigned int file_version
){
    boost::serialization::split_free(ar, t, file_version);
}

#endif // BOOST_WORKAROUND

};
};

#endif // SHMFW_SERIALIZATION_INTERPROCESS_VECTOR_HPP

Answer 2

因此，正如错误所说，它没有所需的serialize方法，或者您可以创建自己的外部serialize方法，这取决于您是否希望它是侵入性的。

这里的教程非常有用:)：

http://www.boost.org/doc/libs/1_54_0/libs/serialization/doc/index.html