在boost中查找反序列化示例

Question

我真的不确定如何进行boost反序列化。下面是想要知道如何进行boost反序列化代码的示例代码

#include <boost/serialization/access.hpp>
#include <boost/serialization/string.hpp>
#include <boost/serialization/shared_ptr.hpp>
#include <boost/archive/text_oarchive.hpp>
#include <boost/smart_ptr/make_shared.hpp>
namespace mydata
{
    struct MyInfo 
    {
        std::string info = "extra info";
        MyInfo(std::string info) : info(std::move(info)) {}
        friend class boost::serialization::access;
        template<class Archive>
            void serialize(Archive &ar, const unsigned int /*version*/)
            {
                ar & info;
            }
    };
    struct MyData
    {
        std::string name;
        std::string type;
        boost::shared_ptr<MyInfo> myref;
        private:
        friend class boost::serialization::access;
        template<class Archive>
            void serialize(Archive &ar, const unsigned int /*version*/)
            {
                ar & name;
                ar & type;
                ar & myref;
            }
    };
}

 int main()
    {
        using namespace mydata;
        MyData data { "this is a name", "this is a type", boost::make_shared<MyInfo>("this is info") };
        boost::archive::text_oarchive oa(std::cout);
        oa << data;
    }

还有类似于反序列化的链接，但在Boost反序列化派生类到基类的指针。

我真的不太了解。。这真的很有帮助。。如果我得到关于boost反序列化的链接，如果存在的话。

Answer 1

你几乎做到了：

int main()
{
    using namespace mydata;
    MyData data { "this is a name", "this is a type", boost::make_shared<MyInfo>("this is info") };
    std::ostringstream oss;
    {
        boost::archive::text_oarchive oa(oss);
        oa << data;
    }
    std::istringstream iss(oss.str());
    {
        boost::archive::text_iarchive ia(iss);
        ia >> data;
    }
}

事实上，您可以将std::stringstream用于输入和输出，但对于纯度，我展示了对称方法（进行冗余复制）。

你需要

#include <sstream>
#include <boost/archive/text_iarchive.hpp>

对于反序列化，您的类需要是可默认构造的：

MyInfo(std::string info = "") : info(std::move(info)) {}

（无关警告：不要在此处使用std::string info = {}，因为这会触发MSVC中的编译器错误）

下面是一个完整的工作示例，它显示反序列化对象具有相同的数据：LiveOnColiru

#include <boost/serialization/access.hpp>
#include <boost/serialization/string.hpp>
#include <boost/serialization/shared_ptr.hpp>
#include <boost/archive/text_oarchive.hpp>
#include <boost/smart_ptr/make_shared.hpp>
#include <sstream>
#include <boost/archive/text_iarchive.hpp>
namespace mydata
{
    struct MyInfo 
    {
        std::string info = "extra info";
        MyInfo(std::string info = "") : info(std::move(info)) {}
        friend class boost::serialization::access;
        template<class Archive>
            void serialize(Archive &ar, const unsigned int /*version*/)
            {
                ar & info;
            }
    };
    struct MyData
    {
        std::string name;
        std::string type;
        boost::shared_ptr<MyInfo> myref;
        private:
        friend class boost::serialization::access;
        template<class Archive>
            void serialize(Archive &ar, const unsigned int /*version*/)
            {
                ar & name;
                ar & type;
                ar & myref;
            }
    };
}
int main()
{
    using namespace mydata;
    std::ostringstream oss;
    {
        MyData data { "this is a name", "this is a type", boost::make_shared<MyInfo>("this is info") };
        boost::archive::text_oarchive oa(oss);
        oa << data;
    }
    MyData cloned;
    std::istringstream iss(oss.str());
    {
        boost::archive::text_iarchive ia(iss);
        ia >> cloned;
    }
    // check equality
    {
        std::ostringstream oss2;
        boost::archive::text_oarchive oa(oss2);
        oa << cloned;
        std::cout << oss.str()  << "n";
        std::cout << oss2.str() << "n";
    }
}

输出：

22 serialization::archive 10 0 0 14 this is a name 14 this is a type 0 1 2 1 0
0 12 this is info
22 serialization::archive 10 0 0 14 this is a name 14 this is a type 0 1 2 1 0
0 12 this is info