Hi all,

Is there a favored way to copy a protobuf message from one type to another 
? A little background:

I have two messages for example:
message A {
   enum foo {
      field1 = 0;
      field2 = 1;
   }
   int32 id;
   string name;
   foo type;
}

message B {
   enum foo {
      field1 = 0;
      field2 = 1;
      field3 =2;
   }
   int32 id;
   string name;
   foo type;
}

I have references to these messages and want to implement this method: 
void copy(A &in, B &out) { 
   // in's contents need to be copied to out
}

the only difference between A and B is the enum field and they are named 
different. There could be more messages within the message types A and B 
with the same fields, but only enum's having an extra field in B. How 
should i go about this ?

Do the following options look feasible :
void copy(A &in, B &out) { 
   // in's contents need to be copied to out
   cast in to type B 
   out = in;
}

void copy(A &in, B &out) { 
   // in's contents need to be copied to out
   Use in.SerializeAsString() and pipe it to out.ParseFromString()
}

Appreciate the community's help!

Thanks!

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