Re: reliably test integer size for portable bit-fiddling?

Use Config and check the ivsize key:

C:\test>perl -MConfig -E"say $Config{ ivsize }"
8

C:\test>\perl32\bin\perl -MConfig -le"print $Config{ ivsize }"
4
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Re^2: reliably test integer size for portable bit-fiddling? by wollmers (Scribe) on Dec 08, 2014 at 20:39 UTC
Thx, but if I can avoid loading Config, and the dependency on it, then pure Perl wins. `root@raspberry2:/home/helmut# time perl -MConfig -E 'print $Config{ivs +ize};' 8 real 0m0.177s user 0m0.160s sys 0m0.010s root@raspberry2:/home/helmut# time perl -e 'print length(pack('j', -1 +))*8;' 64 real 0m0.028s user 0m0.020s sys 0m0.000s` [download]	[reply] [d/l]
Re^3: reliably test integer size for portable bit-fiddling? by RonW (Parson) on Dec 08, 2014 at 21:09 UTC
Config is a core module, so is always available.	[reply]
Re^3: reliably test integer size for portable bit-fiddling? by BrowserUk (Patriarch) on Dec 08, 2014 at 20:50 UTC
Your code seems to work fine here: `C:\test>\perl32\bin\perl -e"print length(pack('j', -1))8;" 32 C:\test>perl -e"print length(pack('j', -1))8;" 64` [download] With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday' 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.	[reply] [d/l]
Re^3: reliably test integer size for portable bit-fiddling? by ikegami (Patriarch) on Dec 10, 2014 at 07:07 UTC
Config is part of Perl, and is Pure Perl.	[reply]


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