Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl: the Markov chain saw
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
Considered having the return of MyLib::strToInt be the bool, and the param be the int? Usually subs/funcs return true false, and details of the operation are inplace updates/ pass by reference/ $_[0] = "hello";/*status = 1;/. Or the author of C++ method strToInt did it that way and thats the way you will remember it in Perl? You could also return 2 elements "($truefalse, $theint) = $instance->strToInt();", and have MyLib::strToInt method take only one param (THIS scalar). If the caller in perl doesn't want the int, they dont need to collect it in list context.

edit: With XS/C/Perl internals, the biggest XSUB debugging tool is looking at the .c code. Try posting that. For C code, you should learn how to create post C processor code, then run it through a code formatter. A 7 character named macro taking 1 param, barely or terribly documented, can expand to a screenful of code after 2-5 layers of macros are expanded. To understand why it failed, looking at the post preprocessor output it the only way. Also compile with optimize=debug and symbols, as you said already, you have a C debugger, so thats correct. Also instead of returning 1 bool, or a list, consider returning a hashref, a hashref is probably overkill for this function.

In reply to Re^2: xs modifying passed value by bulk88
in thread xs modifying passed value by Festus Hagen

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 cooling their heels in the Monastery: (5)
    As of 2015-07-04 03:08 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