The introspection comes from the SIO's of the iod library, they are novel types of object offering introspection at compile time. The iod library makes iteratin

The introspection comes from the SIO's of the iod library, they are novel types of object offering introspection at compile time. The iod library makes iterating on the members of an sio object trivial with the foreach primitive (see https://github.com/matt-42/iod/blob/master/iod/json.hh#L417 https://github.com/matt-42/iod/blob/master/iod/json.hh#L417) so generating a serializer / deserializer like this one is not so complicated since you have access to the type and the name of each members. For more info, check the readme of https://github.com/matt-42/iod https://github.com/matt-42/iod I did my best to explain the concepts of the library. But I'm still lacking of time to polish the documentation....