typedef struct grpc_address_resolver_vtable {
void (*resolve_address)(const char* addr, const char* default_port,
grpc_pollset_set* interested_parties,
grpc_closure* on_done,
grpc_resolved_addresses** addresses);
typedef struct grpc_address_resolver_vtable {
void (*resolve_address)(const char* addr, const char* default_port,
grpc_pollset_set* interested_parties,
grpc_closure* on_done,
grpc_resolved_addresses** addresses);