Thanks. This and Shift versus Sanity are very interesting. I'm still learning all the why's and wherefor's of perl syntax and semantics. I probably will be for some time to come. I will just about have mastered it, and Perl6 will hit the streets! Hopefully, enough of it will carry over to not invalidate the exercise.

A couple of questions arising:

Wouldn't this 

sub fooge_default
{
  my $self = shift;

  $self->fooge(@_);  # Blind parameter passing
}

[download]

be better done as this? 

sub fooge_default
{
  my $self = shift;

  goto &$self->fooge;  # Not entirely sure of the syntax
}

[download]

vis

The goto-&NAME form is highly magical, and substitutes a call to the named subroutine for the currently running subroutine. This is used by AUTOLOAD() subroutines that wish to load another subroutine and then pretend that the other subroutine had been called in the first place (except that any modifications to @_ in the current subroutine are propagated to the other subroutine.) After the goto, not even caller() will be able to tell that this routine was called first.

Also, I realise that finding good examples is always a problem, but your example of where shift is dangerous isn't the fault of shift but of the logic of the test.

Using the correct test in the right place make it irrelavent which method is used to access the args I think? 

sub fooge
{
  die "fooge() needs two arguments\n" unless (@_ ==2);
  my ($foo, $bar) = (shift, shift); # or @_ are equally safe.

  # ...
}

[download]
Well It's better than the Abottoire, but Yorkshire!

In reply to Re: Re^4: Shifty Politics by BrowserUk
in thread stoping and restarting a loop by mnlight

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, details, 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, summary, 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.