[英]Serializing a map of objects to xml using boost::serialization
下面的序列化示例來自boost郵件列表 ,與我想做的幾乎相同。 但是,我更改了存檔,以便將其序列化為XML。 如果我序列化為二進制,編譯不會失敗,但是當序列化為xml時,編譯會失敗。 使用以下方法在basic_xml_oarchive.hpp
中編譯失敗:
// boost code where compile fails
template<class T>
void save_override(T & t, BOOST_PFTO int)
{
// If your program fails to compile here, its most likely due to
// not specifying an nvp wrapper around the variable to
// be serialized.
BOOST_MPL_ASSERT((serialization::is_wrapper<T>));
this->detail_common_oarchive::save_override(t, 0);
}
似乎我做得還不夠,無法序列化std::map<int, CSomeData>
對象,有關如何解決此問題的任何想法?
我的序列化實現:
#include <boost/archive/xml_oarchive.hpp>
#include <boost/archive/xml_iarchive.hpp>
#include <boost/serialization/map.hpp>
#include <fstream>
#include <string>
#include <map>
using namespace std;
// This is a test class to use as the map data.
class CSomeData {
public:
CSomeData(){};
CSomeData(float f0, string str0)
{
m_f0 = f0;
m_str0 = str0;
}
float m_f0;
string m_str0;
private:
friend class boost::serialization::access;
template<class Archive>
void serialize(Archive &ar, const unsigned int version)
{
ar & m_f0;
ar & m_str0;
}
};
// This is the class we really want to try serializing.
class CTest {
public:
CTest(){};
CTest(int nNumber)
{
m_nNumber = nNumber;
// Fill with some dummy data.
m_mTst.insert(make_pair(0, CSomeData(0.23f, "hi hi hi")));
m_mTst.insert(make_pair(1, CSomeData(7.65f, "second one")));
m_mTst.insert(make_pair(2, CSomeData(9.23f, "third one")));
m_mTst.insert(make_pair(3, CSomeData(5.6766, "chosen one")));
}
~CTest(){};
save()
{
std::ofstream ofs("filename");
// Write class instance to archive. Writing seems to work ok.
boost::archive::xml_oarchive oa(ofs);
oa << BOOST_SERIALIZATION_NVP(*this);
}
int m_nNumber;
private:
map<int, CSomeData> m_mTst;
friend class boost::serialization::access;
template<class Archive>
void serialize(Archive &ar, const unsigned int version)
{
ar & m_nNumber;
ar & m_mTst;
}
};
我相信您需要使用XML序列化的名稱標記成員。 這指定要在XML中使用的元素名稱。 即使用類似:
ar & BOOST_SERIALIZATION_NVP(m_f0);
或(在這種情況下更好):
ar & make_nvp("field0", my_f0);
對於二進制序列化,將忽略這些標簽。 此處有更多詳細信息:
http://www.boost.org/doc/libs/1_43_0/libs/serialization/doc/wrappers.html
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