Looks nice to use, at least for the happy path. I'd also say it looks a lot like the non-intrusive pattern for the boost serialization library. That's my defau

Looks nice to use, at least for the happy path. I'd also say it looks a lot like the non-intrusive pattern for the boost serialization library. That's my default tool for this problem just because I'm pretty much always pulling in a pile of boost libraries for any non-trivial C++ project anyway.