可以使用 boost 序列化来序列化 boost::container::strings 吗？答案

【问题标题】：Can boost::container::strings be serialized using boost serialization?可以使用 boost 序列化来序列化 boost::container::strings 吗？
【发布时间】：2021-03-14 06:55:42
【问题描述】：

我正在尝试序列化一个包含 boost::container::string 的类

#include <iostream>
#include <cstdlib>
#include <boost/container/string.hpp>
#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>
#include <boost/serialization/string.hpp>

class car
{
public:
    car() {}
    car(boost::container::string make) : make(make) {}
    boost::container::string make;

private:
    friend class boost::serialization::access;

    template<class Archive>
    void serialize(Archive & ar, const unsigned int version)
    {
        ar & make;
    }
};

int main()
{
    car my_car("ford");

    std::stringstream ss;
    boost::archive::text_oarchive oa(ss);
    oa << my_car;
    
    car new_car;
    boost::archive::text_iarchive ia(ss);
    ia >> new_car;    
}

但以上编译失败，报以下错误：

boost/serialization/access.hpp:116:11: error: 'class boost::container::basic_string<char>' has no member named 'serialize'

可以将相同的代码更改为使用std::string，并且可以正常编译。

boost::container::strings 可以序列化吗？如果可以，我做错了什么或遗漏了什么？

【问题讨论】：

标签： c++ boost boost-serialization

【解决方案1】：

是的。令人惊讶的是，必要的支持并未包含在 Boost 中。虽然如果您查看字符串序列化标头内部，您会发现它支持“原始”，并且只需一行即可启用它：

BOOST_CLASS_IMPLEMENTATION(boost::container::string, boost::serialization::primitive_type)

现在它和std::string一样工作：

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#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>
#include <boost/container/string.hpp>
#include <iostream>

BOOST_CLASS_IMPLEMENTATION(boost::container::string, boost::serialization::primitive_type)

struct car {
    template<class Ar> void serialize(Ar& ar, unsigned) { ar & make; }
    boost::container::string make;
};

int main() {
    std::stringstream ss;
    {
        boost::archive::text_oarchive oa(ss);
        car my_car{"ford"};
        oa << my_car;
    } // close archive

    std::cout << ss.str() << "\n";
    
    boost::archive::text_iarchive ia(ss);
    car new_car;
    ia >> new_car;    
}

打印

22 serialization::archive 17 0 0 ford

【讨论】：