Show how to serialize object to binary blob and restore it using Boost.Serialization

boost_serialization_blob.cpp

#include <sstream>
#include <iostream>

#include <boost/archive/binary_oarchive.hpp>
#include <boost/archive/binary_iarchive.hpp>

struct Foo {
    int the_answer = 0;
    double pi = 0.0;

    template<class Archive>
    void serialize(Archive &ar, const unsigned int /*version*/) {
        (ar & the_answer);
        (ar & pi);
    }
};

int main() {
    // Serialize object into binary blob.
    const Foo input_foo = { 42, 3.14 };
    std::ostringstream oss;
    boost::archive::binary_oarchive oar(oss);
    oar << input_foo;

    const auto blob = oss.str();
    
    // Restore object saved into binary blob.
    Foo output_foo;
    std::istringstream iss(blob);
    boost::archive::binary_iarchive iar(iss);
    iar >> output_foo;
    std::cout << output_foo.the_answer << ' ' << output_foo.pi << '\n';
}