[protobuf] How can i copy pointer to each message??

[기준]

I'm testing protocol buffers, but encountered segment fault that i can't 
understand.

My protocol buffer is below

```
message Sub {
  string value = 1;
}

message Wrapping {
  int32 key = 1;
  repeated Sub sub = 2;
}
```

Testing code is below

```
void Test()
{
  gbtest::Sub* sub = new gbtest::Sub();

  for(int i = 0 ; i<4 ; ++i)
  {
    gbtest::Wrapping wrapping; // Local variable
    wrapping.mutable_sub()->AddAllocated(sub);
    wrapping.set_key(i);

    std::cout << "Size -> " << wrapping->mutable_sub()->size() << std::endl;
  }
}
```




I want copy sub's pointer to each newed wrapping rather than copy it's data.


How can i achieve this?
Plz tell me how.

Thanks.











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