How to reference elements of a returned vector

[jplank]

I have a class that returns a vector.

void test(vector<double> v){
    return v
}

I don't understand how I access the individual elements of the vector when I call test. Is the syntax something like "test(myvector)[0]"? I realize this is probably a really dumb question, but I've been struggling with it for a while.

[Thomas1965]

Normally you pass a STL container by reference or const reference since they can be expensive to copy.
You pass a vector like any other variable.

void test(vector<int> & v)
{
  // use v
}

int main() 
{
  vector<int> nums = {1, 2, 3};

  test(nums);
}

If you want to return a vector from a function you need to specify it as the return type.

vector<int> test2()
{
  vector<int> v = {1, 2, 3};

  return v;
}
int main() 
{
  vector<int> nums = test2();
  // use nums
}