/// <summary>
/// Returns the index of the given customer the first being zero.
/// </summary>
/// <param name="customer"></param>
/// <returns></returns>
public int GetIndexOf(int customer)
{
if (customer == 0)
{
return(0);
}
int idx = _route.GetIndexOf(customer);
if (idx < 0)
{
return(idx);
}
return(idx + 1);
}
