Re^7: How can I set a bit to 0 ?

> bartender1382 posts some nonsensical snippet that doesn't even compile ... and everyone has a ready made solution !!

you seem to miss that he's using constants, like so often in bit operations.

  DB<44> use constant {upload =>0b1, getTicket =>0b10, downLoading=>0b
+100};    

  DB<45> use warnings; use strict; say my $stats = upload | getTicket 
+| downLoading;
7
  DB<46>
[download]

> The interesting thing with this thread is that I can't see how any of the replies (including GF's diversion) relate to the original post.

Now I'd be interested to know how I failed to answer exactly the question given in a concise way, especially given the level of the OP.

Plus explanation most others were lacking including the correct terminology and multiple further read-more links.

Cheers Rolf
_{(addicted to the Perl Programming Language :)

Wikisyntax for the Monastery}

Comment on Re^7: How can I set a bit to 0 ? Download Code

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Re^8: How can I set a bit to 0 ? by hippo (Archbishop) on May 27, 2022 at 14:03 UTC
you seem to miss that he's using constants You seem to assume that he's using constants ;-) Unfortunately, he hasn't provided the definitions of those labels, let alone an SSCCE, so it's all guesswork. 🦛	[reply]
Re^9: How can I set a bit to 0 ? by LanX (Saint) on May 27, 2022 at 14:08 UTC
> You seem to assume that he's using constants Question: is there any other `strict` explanation for barewords as operands? I've seen this pattern so many times with modules exporting flags and IIRC even perldocs°, that this discussion is surprising me. Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery} update °) see last paragraph in `chmod` You can also import the symbolic S_I* constants from the Fcntl module: `use Fcntl qw( :mode ); chmod S_IRWXU\|S_IRGRP\|S_IXGRP\|S_IROTH\|S_IXOTH, @executables; # Identical to the chmod 0755 of the example above.` [download]	[reply] [d/l]
Re^10: How can I set a bit to 0 ? by hippo (Archbishop) on May 27, 2022 at 14:18 UTC
Question: is there any other strict explanation for barewords as operands? Sure, any subs will do - they don't have to be constants: `#!/usr/bin/env perl use strict; use warnings; sub upload () { rand 50 } sub getTicket () { rand 60 } sub downLoading () { rand 70 } sub printCLine { print shift } # Start of bartender1382 code my $stats = 0; $stats = upload \| getTicket \| downLoading; printCLine ($stats); # End of bartender1382 code` [download] 🦛	[reply] [d/l]
Re^11: How can I set a bit to 0 ? by LanX (Saint) on May 27, 2022 at 14:26 UTC
Re^12: How can I set a bit to 0 ? by hippo (Archbishop) on May 27, 2022 at 16:11 UTC
Some notes below your chosen depth have not been shown here
Re^8: How can I set a bit to 0 ? by syphilis (Archbishop) on May 27, 2022 at 14:55 UTC
Now I'd be interested to know how I failed to answer exactly the question given in a concise way, especially given the level of the OP. I didn't say that you (or anyone else) had failed to answer the question. All I said was that I couldn't see how the answers given related to the question that was asked ... for the simple reason that I couldn't work out what the question actually was (owing to lack of details given). Sure, I know the OP wants to set bits in something - in a PV ? in an IV ? in an NV ? in some object (maybe Math::GMP or Bit::Vector) ? Everyone else seems to reckon they know, and if they were able to deduce that from the original post, then well done !! But I don't have that level of psychic acuity. Cheers, Rob	[reply]
Re^9: How can I set a bit to 0 ? by LanX (Saint) on May 27, 2022 at 15:10 UTC
bit operations happen normally on unsigned integers, I'd say in >90% of the cases (at least) And I've already shown two instances of perldocs demonstrating exactly that pattern. > in a PV ? in an IV ? in an NV ? I reckon IV is an integer value ... please explain the rest° in this context, my perlguts are aching ;-) And the OP will most probably only know "scalar". Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery} °) OK looking up in "Advanced Perl Programming" (sic) > A scalar value (SV) contains the value of the scalar, a reference count, and a bitmask to describe the state of the scalar. The scalar may be an integer value ("IV"), a double ("NV"), a string ("PV" for pointer value), I can't see how this is relevant here. update I mean: If someone asks how best to hold a hammer, do you complain he didn't tell you which alloy the nails are made of and where the original ore was mined? Seriously?	[reply]

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