It's not made any easier by what gets done behind the scenes: 
use warnings;

use Inline C => Config =>
    CLEAN_AFTER_BUILD => 0,
    BUILD_NOISY => 1;

use Inline C => <<'EOC';

void foo1 (int x) {
     Inline_Stack_Vars;
     Inline_Stack_Reset;
     Inline_Stack_Push(sv_2mortal(newSVuv(x * 3)));
     Inline_Stack_Done;
     Inline_Stack_Return(1);
}

SV * foo2 (int x) {
     return newSVuv(x * 3);
}

EOC

print foo1(7), "\n", foo2(8), "\n";

[download]
Notice that foo1() specifically mortalises, while foo2() does not. Seems strange - but if you look at the C file that gets generated you'll see that the mortalisation got inserted into foo2() for you.

Although I've used an Inline::C script as a demo, it's xsubpp behaviour - nothing to do with Inline at all.

Cheers,
Rob

In reply to Re: XS-ive Mortality. (or when to use sv_2mortal()) by syphilis
in thread XS-ive Mortality. (or when to use sv_2mortal()) by BrowserUk

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.