Function error

src/operations.cpp:253–268

  const error_code ok;

  bool error(bool was_error, error_code* ec, const string& message)
  {
    if (!was_error)
    {
      if (ec != 0) ec->clear();
    }
    else  
    { //  error
      if (ec == 0)
        BOOST_FILESYSTEM_THROW(filesystem_error(message,
          error_code(BOOST_ERRNO, system_category())));
      else
        ec->assign(BOOST_ERRNO, system_category());
    }
    return was_error;
  }

  bool error(bool was_error, const path& p, error_code* ec, const string& message)
  {