I'm working with looping over a slice of a large struct in Golang like this:

type A struct {
// large struct, about 200 bytes
}

func f() {
  var data []A = getData()
  for _, v := range data {
    // read fields in v
  }
}

I'm wondering if a slice is of length N, will v be copied N times, or is it just something like a reference in C++, or is it copy-on-write?