[protobuf] [c++] incomplete type when passing a protobuf into a class member function

[Perd infara]

Hi, i'm having an issue like this:

people.proto:
```
syntax = "proto3";
message people{
    string name = 1;
}
```

then there is a class A:
```
#include "people.pb.h"
class A{
public:
 A();
~A();
void getName(people p){
    std::cout << p.name() << std::endl;
}
```
then clion keep telling me the p variable: 
Variable has incomplete type "people"

what should i do here?


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