Cannot serialize optional unique pointer

[rael007]

I read the documentation which indicated that optional<unique_ptr> was supported by zpp bits. Not sure if I'm doing something very stupid, but using gcc-13 on Mac, I cannot get the following code to compile.

#include "zpp_bits.h"
#include <memory>
#include <string>
#include <vector>

namespace zzz
{
template < class T, class B >
std::size_t serialize( const T& t, B& data )
{
    zpp::bits::out out{ data };
    if ( auto result = out( t ); failure( result ) ) { return 0; }
    return out.position();
}

template < class T, class B >
std::size_t deserialize( T& t, const B& data )
{
    zpp::bits::in in{ data };
    if ( auto result = in( t ); failure( result ) ) { return 0; }
    return in.position();
}

}

struct foo
{
    std::string name;
    int         count;
};

struct bar
{
    std::optional< std::unique_ptr< foo > > foos;
};

int main()
{
    {
        std::vector< char >                     data;
        std::optional< std::unique_ptr< foo > > foos;
        // compiles ok:
        zzz::serialize( foos, data );
    }

    {
        std::vector< char > data;
        // does not compile:
        bar b;
        zzz::serialize( b, data );
    }
}

[Eyal Z]

Hi,

Thanks for reporting, do you mind reproducing this in godbolt and confirming this is the same error you receive on your Mac, then attach the godbolt link?

Thanks

[rael007]

Ok, or you can just mark me as an idiot. Of course, after posting this I figured out how to get around the issue:

struct bar
{
    std::optional< std::unique_ptr< foo > > foos;
};

auto serialize( const bar& bar ) -> zpp::bits::members< 1 >;

Sorry for the false alarm, Eyal.