Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl-Sensitive Sunglasses
 
PerlMonks  

Comment on

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

By the way, if that BEGIN block will end up being use statement, use subs is not needed. For example,

override.pm:

use strict; use warnings; package override; sub import { my ($class, $sub_name, $sub) = @_; my $pkg_name = caller(); my $pkg_sym = _pkg_symtab($pkg_name); delete $pkg_sym->{$sub_name}; if ($sub) { no strict 'refs'; *{"${pkg_name}::$sub_name"} = $sub; } } sub _pkg_symtab { my ($pkg) = @_; my $p = \%::; $p = $p->{"${_}::"} for split /::/, $pkg; return $p; } 1;

test.pl:

use strict; use warnings; open(my $fh, '<', $0); # Calls CORE::open use override open => sub { print "Hi\n"; }; open(my $fh2, '<', $0); # Prints Hi use override open => sub { print "Ho\n"; }; open(my $fh4, '<', $0); # Prints Ho use override open => undef; open(my $fh5, '<', $0); # Calls CORE::open

Output:

>perl test.pl Hi Ho

From there, I guess the idea is to make overrideautodie a lexical pragma. Shouldn't be too hard.


In reply to Re: Using delete package::{subroutine} to change resolution of subroutines by ikegami
in thread Using delete package::{subroutine} to change resolution of subroutines by pjf

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
  • 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?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others romping around the Monastery: (5)
    As of 2015-07-04 02:12 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









      Results (57 votes), past polls