void operator()(
rapidjson::GenericValue<Encoding, Allocator>& rjv,
Allocator& alloc,
T* v
) const {
if(bool(v)) {
_comp(rjv, alloc, *v);
} else {
rjv.SetNull();
}
}
void operator()(
rapidjson::GenericValue<Encoding, Allocator>& rjv,
Allocator&,
std::nullptr_t
) const { rjv.SetNull(); }