Function is_root_separator

src/path.cpp:470–495

  //  is_root_separator  ---------------------------------------------------------------//

  bool is_root_separator(const string_type & str, size_type pos)
    // pos is position of the separator
  {
    BOOST_ASSERT_MSG(!str.empty() && is_separator(str[pos]),
      "precondition violation");

    // subsequent logic expects pos to be for leftmost slash of a set
    while (pos > 0 && is_separator(str[pos-1]))
      --pos;

    //  "/" [...]
    if (pos == 0)  
      return true;

# ifdef BOOST_WINDOWS_API
    //  "c:/" [...]
    if (pos == 2 && is_letter(str[0]) && str[1] == colon)  
      return true;
# endif

    //  "//" name "/"
    if (pos < 3 || !is_separator(str[0]) || !is_separator(str[1]))
      return false;

    return str.find_first_of(separators, 2) == pos;
  }

  //  filename_pos  --------------------------------------------------------------------//