Beefy Boxes and Bandwidth Generously Provided by pair Networks
Pathologically Eclectic Rubbish Lister
 
PerlMonks  

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
Well, if I had to remove the goto, I would rewrite it as:
{ eval { tie %session, 'Apache::Session::MySQL', $session, { Handle => HH::DB->db_Main, LockHandle => HH::DB->db_Main } }; if ($@) { if ($@ =~ /^Object does not exist/) { $session = undef; redo; } else { print $cgi->header; die_nice('Database Error', 'Unable to connect at this time +'); } } }
But a redo (just like next and last is just a glorified goto. People who just balk at any sight of a goto have at best heard about Dijkstra's article Go To Considered Harmful (which wasn't titles bij Dijkstra, but by Hoare), but never read the paper, or not understood it. Dijkstra just warns that goto can easily lead to unstructured programs, he doesn't say it's evil all the time.

Knuth has also written about this subject, in his Structured Programming with the Go To statement. His view is less far away from Dijkstra as that the titles suggest.

Abigail


In reply to Re: GOTO considered (a necessary) evil? by Abigail-II
in thread GOTO considered (a necessary) evil? by gav^

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    [erix]: ( also: UniCorn Throne )
    [zentara]: erix I hope both tusks pointed in the same direction :-)
    LanX "♪..♫ Last night a DJ killed my wife ♪..♫ "
    zentara...oO 1 more reason I prefer Perl to Python is I can't believe how long Python takes to compile, and you can't disable the myriad of tests
    [LanX]: so that's where you've been the last two years? Compiling Python?
    [zentara]: LanX no! I was learning why Krishna made me into a unicorn. :-)

    How do I use this? | Other CB clients
    Other Users?
    Others cooling their heels in the Monastery: (10)
    As of 2017-03-30 16:43 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?
      Should Pluto Get Its Planethood Back?



      Results (361 votes). Check out past polls.