27 struct TransferId {  struct
31     constexpr TransferId() : TransferId(TransferDirection::READ, 0) {}  in TransferId()  argument
32     TransferId(const TransferId& copy) = default;
33     TransferId(TransferId&& move) = default;
35     TransferId& operator=(const TransferId& copy) = default;  argument
36     TransferId& operator=(TransferId&& move) = default;  argument
39     constexpr TransferId(TransferDirection direction, uint64_t id) : direction(direction), id(id) {}  in TransferId()  function
42     bool operator==(const TransferId& rhs) const {
50     static constexpr TransferId read(uint64_t id) {  in read()  argument
51         return TransferId(TransferDirection::READ, id);  in read()
54     static constexpr TransferId write(uint64_t id) {  in write()  argument
55         return TransferId(TransferDirection::WRITE, id);  in write()
58     static constexpr TransferId from_value(uint64_t value) {  in from_value()  argument
61         TransferId result;  in from_value()
70 struct hash<TransferId> {
71     size_t operator()(TransferId id) const { return hash<uint64_t>()(static_cast<uint64_t>(id)); }