Beefy Boxes and Bandwidth Generously Provided by pair Networks
Syntactic Confectionery Delight
 
PerlMonks  

Re^3: XS: returning a 64-bit unsigned int?

by Anonymous Monk
on Sep 27, 2011 at 06:58 UTC ( #928024=note: print w/ replies, xml ) Need Help??


in reply to Re^2: XS: returning a 64-bit unsigned int?
in thread XS: returning a 64-bit unsigned int?

Right, but shouldn't newSVuv make a UV and not an IV? Talk about false advertising :)
  • Comment on Re^3: XS: returning a 64-bit unsigned int?

Replies are listed 'Best First'.
Re^4: XS: returning a 64-bit unsigned int?
by BrowserUk (Pope) on Sep 27, 2011 at 07:08 UTC
    shouldn't newSVuv make a UV and not an IV? Talk about false advertising :)

    I concur completely. But you think that ones bad, what d'ya think newSVrv( rv ) does?


    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
    "Science is about questioning the status quo. Questioning authority".
    In the absence of evidence, opinion is indistinguishable from prejudice.
Re^4: XS: returning a 64-bit unsigned int?
by ikegami (Pope) on Sep 27, 2011 at 07:21 UTC

    Perl claims the right to convert among equivalent representations. It's an optimisation that an UV isn't used unless needed since UVs require extra handling.

    >perl -MDevel::Peek -e"Dump(0x7FFFFFFF)" SV = IV(0x1de9d00) at 0x1de9d04 REFCNT = 1 FLAGS = (PADTMP,IOK,READONLY,pIOK) IV = 2147483647 >perl -MDevel::Peek -e"Dump(0x80000000)" SV = IV(0x4a9d00) at 0x4a9d04 REFCNT = 1 FLAGS = (PADTMP,IOK,READONLY,pIOK,IsUV) UV = 2147483648

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://928024]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others examining the Monastery: (6)
As of 2016-06-25 16:41 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    My preferred method of making French fries (chips) is in a ...











    Results (326 votes). Check out past polls.