Pass the special value corresponding to the std::monostate object to the specified algorithm. This function integrates with the bslh modular hashing system and effectively provides a bsl::hash specialization for std::monostate.
Declared in <bslh_hashvariant.h>
template<class HASH_ALGORITHM>
void
hashAppend(
HASH_ALGORITHM& algorithm,
std::monostate const&);