使用Boost序列化的Microsoft GUID序列化？

Question

I have the following:

struct Member
{
    GUID id;
    int extra;

    template<class Archive>
    void serialize(Archive & ar, const unsigned int file_version)
    {
        ar & id;
        ar & extra;
    }

}

When I compile the code I get the following compile error:

Error 25 error C2039: 'serialize' : is not a member of '_GUID'

How do I specialise boost serialization for Microsoft GUID?

Answer 1

Here's a hint: assuming the UUID type is POD, you can use make_binary_object .

Here's a mockup type for UUID as a POD:

#include <array>

using UUID = std::array<uint8_t, 16>; // mock up
static_assert(std::is_pod<UUID>(), "assumes UUID is POD");

Any POD will do. Eg boost::uuids::uuid ¹ is also POD. Same for struct UUID { char data[16]; } struct UUID { char data[16]; } etc.

Non-intrusive serialization:

#include <boost/serialization/serialization.hpp>
#include <boost/serialization/binary_object.hpp>

namespace boost { namespace serialization {
    template <typename Ar>
        void serialize(Ar& ar, UUID& u, unsigned /*version*/) {
            ar & make_binary_object(&u, sizeof(u));
        }
} }

Demo

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

int main() {
    std::stringstream ss;
    {
        boost::archive::text_oarchive oa(ss);
        UUID u {{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f}};
        oa << u;
    }

    std::cout << ss.str() << "\n";

    {
        boost::archive::text_iarchive ia(ss);
        UUID u {};
        ia >> u;

        std::copy(begin(u), end(u), std::ostream_iterator<int>(std::cout << "roundtripped: ", " "));
    }
}

---

¹ although that library already defines serialization in the boost/uuid/uuid_serialize.hpp header