Beefy Boxes and Bandwidth Generously Provided by pair Networks
P is for Practical

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
I wonder if adding the symbols in a call checker associated with reduce would be early enough.
#define PERL_NO_GET_CONTEXT #include "EXTERN.h" #include "perl.h" #include "XSUB.h" STATIC OP* ck_reduce(pTHX_ OP* o, GV* namegv, SV* ckobj) { #define check_reduce(a,b,c) check_reduce(aTHX_ a,b,c) PERL_UNUSED_ARG(namegv); PERL_UNUSED_ARG(ckobj); (void*)gv_fetchpvs("a", GV_ADD|GV_ADDMULTI, SVt_PV)); (void*)gv_fetchpvs("b", GV_ADD|GV_ADDMULTI, SVt_PV)); return o; } /* ======================================== */ MODULE = List::Util PACKAGE = List::Util BOOT: { CV* const reducecv = get_cvn_flags("List::Util::reduce", 18, GV_ADD +); cv_set_call_checker(reducecv, ck_reduce, &PL_sv_undef); }

There's something missing since $a and $b's package isn't mentioned anywhere, but you should be able to grab the right package since the checker is called for each call of reduce.

If this works, the warning will be disabled if and only if reduce is used, and only for the package using it.

In reply to Re: Eliminating "used only once" warnings from List::Util::reduce by ikegami
in thread Eliminating "used only once" warnings from List::Util::reduce by davido

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, 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?

    What's my password?
    Create A New User
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others cooling their heels in the Monastery: (6)
    As of 2015-11-27 11:43 GMT
    Find Nodes?
      Voting Booth?

      What would be the most significant thing to happen if a rope (or wire) tied the Earth and the Moon together?

      Results (726 votes), past polls