Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl Monk, Perl Meditation
 
PerlMonks  

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
..."dereferencing" a variable...
It isn't dereferencing a 'variable' but a subroutine.
"Take the value of $functions{$doit} and treat it as a sub name" Is that about right?
More or less, yeah. But I have to admit that my powers of syntax explaining are pretty poor, I understand in my head what is going on but I don't want to lead you down the garden path with my crap explanations. There are many people here who could explain far more eloquently what is going on and hopefully one of them will step in to help both of us ;)

In reply to Re: Re: Re: Avoiding user-input in sub calls. by barrd
in thread Avoiding user-input in sub calls. by pekkhum

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?
    [dazz]: Hi I have grabbed an image from an IP camera with Image::Grab. I then want to pass that image object to a subroutine where I do a read-only test on the image with Image:Magick.
    [dazz]: How do I pass an image object to a subroutine and then apply a Image::Magick a read-only method to the image object???
    [dazz]: Also, I want to use Image::Magick to annotate and composite (not in a sub). How do I take a Image::Grab object and apply Image::Magick write methods to it??
    [dazz]: At present, I am saving the Image::Grab image to disk, then creating a new Image::Magick object that reads the disk file.
    [dazz]: .
    [choroba]: Discipulus Sounds interesting. Any pictures of the puppets or paintings?

    How do I use this? | Other CB clients
    Other Users?
    Others surveying the Monastery: (8)
    As of 2017-03-27 07:42 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?
      Should Pluto Get Its Planethood Back?



      Results (317 votes). Check out past polls.