Beefy Boxes and Bandwidth Generously Provided by pair Networks
Syntactic Confectionery Delight
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
He (TheDamian) further advises you to use anonymous subroutines and the CPAN Sub::Installer module when you have a need to create new subroutines that are built around some expression that the user supplies.

While Sub::Installer is certainly a good idea (insulating the user from the evils of symbol table manipulation, which is at least as dangerous as string eval in the 'wrong' hands). It's code can hardly be considered to contain "Best Practices" IMO. It clearly abuses UNIVERSAL in a way which affects not only the code which uses it, but all other running Perl code. This is the offending code:

package UNIVERSAL; use base 'Sub::Installer';
This would mean that every Perl object will respond true to the query $object->isa('Sub::Installer'). Again, IMO, that is not a Best Practice, but instead a really really bad idea.

Sorry, I am a little passionate about code which tramples over the Perl 5 object model like this.

But fear not! CPAN will save the day. As an alternative, I offer Sub::Install an excellent module which does not assert it's will upon your entire runtime.

-stvn

In reply to Re^2: Small examples of string eval by stvn
in thread Small examples of string eval by spurperl

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!
  • 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
  • Outside of code tags, you may need to use entities for some characters:
            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?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others surveying the Monastery: (6)
    As of 2014-10-25 00:59 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      For retirement, I am banking on:










      Results (139 votes), past polls