protoc-gen-deepcopy

// +gen:deepcopy
message Person {
  string name = 1;
  bytes any = 3;
  string email = 4;
}

go get github.com/vine-io/vine/cmd/protoc-gen-deepcopy

protoc -I=$GOPATH/src --gogo_out=:.  --deepcopy_out=:. proto/deepcopy.proto

// DeepCopyInto is an auto-generated deepcopy function, coping the receiver, writing into out. in must be no-nil.
func (in *Person) DeepCopyInto(out *Person) {
	*out = *in
}

// DeepCopy is an auto-generated deepcopy function, copying the receiver, creating a new Person.
func (in *Person) DeepCopy() *Person {
	if in == nil {
		return nil
	}
	out := new(Person)
	in.DeepCopyInto(out)
	return out
}

func main() {
	p := &helloworld.Person{
		Name:  "Vine",
		Any:   []byte("Hello"),
		Email: "aa@gmail.com",
	}

	fmt.Printf("%p %v\n", p, p)
	pc := p.DeepCopy()
	fmt.Printf("%p %v\n", pc, pc)
}
// output:  
//  0xc0002ea280 name:"Vine" any:"Hello" email:"aa@gmail.com"
//  0xc0002ea2c0 name:"Vine" any:"Hello" email:"aa@gmail.com"

// +gen:deepcopy
message Struct {
    string field1 = 1;
    string field2 = 2;
}

// +gen:deepcopy
message P {
}