Beefy Boxes and Bandwidth Generously Provided by pair Networks
Clear questions and runnable code
get the best and fastest answer

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

Let me try to toss-in an explanation of the big picture here:

(1)   In Perl, an “object” is (usually...) a hashref that has been passed to the built-in function, bless, which takes as its (usually...) two parameters the hashref to be blessed and a package name.   Internally, Perl now flips a switch that says that it is “blessed,” and associates the specified package-name with it.   (Yes, it can be, and occasionally is, re-blessed, which changes the associated package-name.)

Any piece of code which serves this function, no matter where it is located nor what it is named, serves this purpose.   Specifically, there is nothing “magical” about a function named new.

(2)   When something has been blessed, it becomes possible to use the $obj->methodname(args...) syntax.   This simply translates to a subroutine call, to a sub (maybe...) found in the previously-associated package, but passing $obj as an additional, first, parameter.

You will therefore find that these subroutines begin with a statement such as my $self = shift;, which grabs that first-parameter that has been added.   Once again, the name $self is simply a convention.

HTH...   If you are used to looking at very formal, computer-science-y language implementations, you might be a bit startled by Perl.

In reply to Re: Perl semi-object without a constructor by sundialsvc4
in thread Perl semi-object without a constructor by Wiggins

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?

    What's my password?
    Create A New User
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others rifling through the Monastery: (5)
    As of 2019-02-23 06:26 GMT
    Find Nodes?
      Voting Booth?
      I use postfix dereferencing ...

      Results (119 votes). Check out past polls.