38 struct WithId {  struct
39   WithId() : id_(next_id<Derived>()) {}  in WithId()  function
40   WithId(const WithId& that) : id_(that.id_) {}  in WithId()  function
41   WithId(WithId&& that) : id_(that.id_) { that.id_ = 0; }  in WithId()  function
42   WithId& operator=(const WithId& that) {
46   WithId& operator=(WithId&& that) {
54   friend bool operator==(const WithId& a, const WithId& b) {  argument
57   friend bool operator!=(const WithId& a, const WithId& b) { return !(a == b); }
60   explicit WithId(size_t id) : id_(id) {}  in WithId()  function
98     : absl::container_internal::hash_testing_internal::WithId<
107     : absl::container_internal::hash_testing_internal::WithId<