C++ memcpy to char* from c_str

Question

I've done a bit of basic reading and from what I've gathered .c_str() always has a null terminator.

I have a fairly simple C++ program:

int main(int argc, char** argv)
{
  std::string from = "hello";
  char to[20];
  memcpy(to, from.c_str(), strlen(from.c_str())+1);
  std::cout<< to << std::endl;
  return 0;
}

Will that memcpy ensure that I copy over a null-terminated string to my variable to (provided that my string from is shorter in length)?

Answer 1

memcpy doesn't know what is a string. you give it a range to copy. it depends on strlen here to provide the termination point of range