protobuf : The object created by add has the same member

Question

This is the proto：

message GetIdKeyValueResp {
  optional int32 ret = 1;
  repeated IpInfo ips = 2;
}

message IpInfo {
  optional string ip = 1;
  optional string status = 2;
  optional uint64 update_time = 3;
  optional Disks disks = 4;
}

message DiskHistory {
  optional uint64 time = 1;
  optional string status = 2;
}

message Disk {
  optional uint32 index = 1;
  optional string status = 2;
  optional uint64 time = 3;
  repeated DiskHistory history = 4;
}

message Disks {
  optional int32 disk_num = 1;
  repeated Disk disk = 2;
}

And when I run the code

  GetIdKeyValueResp resp;
  for (int i = 0; i < 10; i++) {
    IpInfo* ipinfo = resp.add_ips();
    cout << &(ipinfo->disks()) << endl;
  }

The output is:

Obviously they shared an address, so when I modify the disks information of one of the ips, the other ips will also be modified.I want to know why this is and how to solve it.

You have not added disks yet, you have created references to the default empty Disk record. Disks are created on modifications (copy on write). — 273K, Nov 04 '21 at 07:42

score 1 · Answer 1 · answered Nov 04 '21 at 07:58

1

I use mutable_disks() and its ok

answered Nov 04 '21 at 07:58

q57259028

59
6

protobuf : The object created by add has the same member

1 Answers1