Problem: You can't write to protocol or model safely because one of the force functions wasn't used. You might end up changing variables and constants you didn't mean to change. (They might have fixed that in 5.24?) 

use strict;
use warnings;

use feature qw( say );

use Inline C => <<'__EOS__';

   void testing(char* s) {
      s[0] = 'y';
   }

__EOS__

my $x = "x";
my $y = $x;
say "$x-$y";
testing($y);
say "$x-$y";

[download]
x-x
y-y   <-- Changed both $x and $y

[download]
or 
for (1..2) {
   my $y = "x";
   say $y;
   testing($y);
}

[download]
x
y     <-- Changed the constant!

[download]

Note: The caller will need to do s/\0.*// for $protocol, $model;

In reply to Re^4: Passing integer pointer in XS? (OUTPUT:) by ikegami
in thread Passing integer pointer in XS? by martin67

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.