Implementation of optionally loading name value pairs if they exist for Cereal.
Include the single header cereal_optional_nvp.h
In you serialization load function you can use either load_optional_nvp or the macro CEREAL_OPTIONAL_NVP which will use the variable name as the NVP name.
For example:
template <class Archive>
void load(Archive & ar)
{
ar(CEREAL_NVP(x));
CEREAL_OPTIONAL_NVP(ar, y);
cereal::load_optional_nvp(ar, "z", z);
}Loading objects must be done in the same order they're saved.
MIT