Serializing class derived from std::variant

[blear-cadence]

Sorry if I missed this, but I checked the discussions and searched the doc, but I can't see how to make this work.

#include "zpp_bits.h"

#include <string>
#include <variant>
#include <vector>

struct s : public std::variant< int, std::string >
{
    bool holds_id() const { return std::holds_alternative< int >( *this ); }
    int  get_id() const { return std::get< int >( *this ); }
    bool holds_name() const
    {
        return std::holds_alternative< std::string >( *this );
    }
    std::string get_name() const { return std::get< std::string >( *this ); }

    using base = std::variant< int, std::string >;
    using base::base;
    using base::operator=;
};

int main()
{
    s an_s;
    an_s = 34;

    std::vector< char > v;
    zpp::bits::out      out{ v };
    auto                result = out( an_s );

    if ( failure( result ) )
    {
        return 1;
    }
    return 0;
}