Protobuf Partially Copy vector into repeated filed

In this question, it is answered how a vector can be copied into a repeated field by using fMessage.mutable_samples() = {fData.begin(), fData.end()}; ( and the other direction works too ).

But how about a partial copy? Would the below work?

std::copy(
  fData.begin() + 3, fData.end() - 2,
  fMessage.mutable_samples()->begin() + 3
);

In this scenario fMessage has already allocated elements in the samples field, and std::copy would overwrite the items already present in fMessage.

I created a program to test this, and it seems that using std::copy works!

syntax = "proto3";

message messagetest{
    repeated float samples = 6;
}

#include <iostream>
#include <vector>

#include "message.pb.h"

int main(){
  std::vector<float> fData(10);
  messagetest fMessage;
  std::generate(fData.begin(),fData.end(),[&fMessage](){
    static float num = 0.0;
    num += 1.0;
    fMessage.add_samples(0.0);
    return num;
  });
  for(const float& f : fData)
     std::cout << "[" << f << "]";
  std::cout << std::endl;
  
  std::copy(
    fData.begin() + 3, fData.end() - 2,
    fMessage.mutable_samples()->begin() + 3
  );
  
  for(const float& f : fMessage.samples())
     std::cout << "[" << f << "]";
  std::cout << std::endl;
  
  
  return 0;
}

output:

[1][2][3][4][5][6][7][8][9][10]
[0][0][0][4][5][6][7][8][0][0]