使用 Boost 将结构序列化为 XML 时出错

Question

我正在尝试使用 Boost 将一些结构序列化为 XML。我无法更改结构，所以我尝试以非侵入方式进行。

按照错误消息 docs I managed to get flat text serialization to work. However when I try to extend it to XML by looking at the XML example I'm unable to build and get errors from within the Boost libraries. I find only 中的简单“非侵入式版本”示例，我看不出如何将其应用于我的情况来解决它。一般寻找其他帖子和示例，我只看到不涉及将代码放入结构中的引用。

代码和错误如下。有没有对此足够熟悉的人指出我做错了什么？

密码是

#include <iostream>
#include <iomanip>
#include <iostream>
#include <fstream>
#include <string>
#include <boost/config.hpp>
#include <boost/archive/xml_oarchive.hpp>
#include <boost/archive/xml_iarchive.hpp>

void boostTest();

int main()
{
    boostTest();
}

struct s_FileInfo
{
    //const char* comment;
    int test;
    int motionCases; //number of motion cases
};

void boostTest()
{
    struct s_FileInfo test = { 3,2 };
    std::ofstream ofs("c:\sandpit\test.xml", std::ofstream::out); 
    boost::archive::xml_oarchive oa(ofs);
    oa << BOOST_SERIALIZATION_NVP(test);
    ofs.close();
}

namespace boost {
    namespace serialization {

        template<class Archive>
        void serialize(Archive& ar, s_FileInfo& g, const unsigned int version)
        {
            ar& g.test;
            ar& g.motionCases;
        }

    } // namespace serialization
} // namespace

我在尝试构建时遇到的错误是

'mpl_assertion_in_line_6': const object must be initialized 'int boost::mpl::assertion_failed<false>(boost::mpl::assert<false>::type)': cannot convert argument 1 from 'boost::mpl::failed ************boost::serialization::is_wrapper<T>::* ***********' to 'boost::mpl::assert<false>::type'

两者都在 boost\archive\basic_xml_oarchive.hpp

Answer 1

断言说明了一切：

// 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 >));

那么，让我们补充一下

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#include <boost/archive/xml_iarchive.hpp>
#include <boost/archive/xml_oarchive.hpp>
#include <fstream>

void boostTest();
int main() { boostTest(); }

struct s_FileInfo {
    // const char* comment;
    int test;
    int motionCases; // number of motion cases
};

void boostTest() {
    s_FileInfo    test {3, 2};
    std::ofstream ofs("test.xml");
    {
        boost::archive::xml_oarchive oa(ofs);
        oa << BOOST_SERIALIZATION_NVP(test);
    }
}

namespace boost::serialization {
    template <class Ar> void serialize(Ar& ar, s_FileInfo& g, unsigned /*unused*/) {
        ar& BOOST_SERIALIZATION_NVP(g.test);
        ar& BOOST_SERIALIZATION_NVP(g.motionCases);
    }
} // namespace boost::serialization

创建 test.xml:

<!DOCTYPE boost_serialization>
<boost_serialization signature="serialization::archive" version="19">
<test class_id="0" tracking_level="0" version="0">
    <g.test>3</g.test>
    <g.motionCases>2</g.motionCases>
</test>
</boost_serialization>

使用 Boost 将结构序列化为 XML 时出错

Build error serializing struct to XML using Boost

c++

boost