Not a bug, but did perl really mean that? #40
Comments
From jmh@mail.msen.comTruth in perl can be a problem when dealing with bitwise operators. If we want to work with pipes, we play with select() a lot. pipe(A,B); # Setup pipes, fork, etc. vec($ready_a, fileno(A), 1) = 1; #Get ready for select select($rout=$rin, undef, undef, 10); In C, if we want to see if a particular selector is set, we can say: if ($rout & $ready_a) { # do something useful } We can't do this in perl because the return of ($rout & $ready_a) This can be gotten around by saying: Unfortunately, I don't know if this is good for 100% of the cases Trying to evaluate things in a numeric context using == doesn't What would be most useful is, when dealing with vectors, to I realize that using the bitcounting operator is a useful workaround, -- |
From [Unknown Contact. See original ticket]Jeff, You pointed out that a string consisting of \0 bytes isn't false, I've marked the bugreport as closed. Cheers; Nat |
From [Unknown Contact. See original ticket]
I don't think that that does what you wish it did. open(NEWFH, ">/dev/null") || die $!; Prints "No bits here." See why? :-) --tom |
From [Unknown Contact. See original ticket]Tom Christiansen writes:
Oh bollocks. Change the regexp: Thanks for pointing that out, Tom. Nat |
From @tamiasOn Mon, Mar 20, 2000 at 09:20:23PM -0700, Nathan Torkington wrote:
I think that should be \z. \Z can also match before a newline. Ronald |
From [Unknown Contact. See original ticket]Ronald J Kimball writes:
That's it, I'm taking up Python. Nat |
From [Unknown Contact. See original ticket]
That's right. That's why I, and even moreso Greg, went it and fixed a --tom |
From [Unknown Contact. See original ticket]On Mar 20, Nathan Torkington said:
Yeah, good idea. Quadruple backslash to get a single backslash in a -- |
From [Unknown Contact. See original ticket]Tom Christiansen wrote:
Only when using \A. There is no need for \A in /\Ablah\z/ since it is /^blah\z/ I find the lack of symmetry here makes the intent clearer. -- |
From [Unknown Contact. See original ticket]
That's not correct. $* may be set. --tom |
From [Unknown Contact. See original ticket]Tom Christiansen wrote:
print "The meaning of deprecated in perl is ", Set $[ appropriately. -- |
From [Unknown Contact. See original ticket]
No, that's not the same. --tom |
From [Unknown Contact. See original ticket]Tom Christiansen wrote:
You are correct. Does it not make more sense to remove such -- |
From [Unknown Contact. See original ticket]
One does what one can, as one can. Right now, one can code --tom |
From [Unknown Contact. See original ticket]Tom Christiansen wrote:
And that is appreciated.
I see no reason to ever go there. IMHO, it is time for $* to retire -- |
From [Unknown Contact. See original ticket]Is this right? % P -MO=Showlex,retval -e 'sub retval { my $self = shift; my $n = sub { my $arg = shift; return $self->{$arg} } } ' What's all that well, stuff? And what's the thing whose name is % P -MO=Xref -e 'sub retval { my $self = shift; my $n = sub { my $arg = shift; return $self->{$arg} } } ' Here are more. % perl -MO=Showlex /tmp/testit % perl -MO=Showlex,start /tmp/testit That was from this guy that you saw before: % cat /tmp/testit --tom |
From [Unknown Contact. See original ticket]
...
.... Note that those two, at least, are not platform specific. --tom |
From [Unknown Contact. See original ticket]
Well, I've heard nothing, so here's the patch that implements this. Inline Patch--- perl5db.pl-presig Tue Mar 14 18:42:13 2000
+++ perl5db.pl Wed Mar 15 06:23:49 2000
@@ -346,16 +346,24 @@
return 1;
}
-if (-f $rcfile) {
- safe_do("./$rcfile");
-}
-elsif (defined $ENV{HOME} && -f "$ENV{HOME}/$rcfile") {
+{
+ my @sb; # stat buff to check duplicate loading
+ if (defined $ENV{HOME} && -f "$ENV{HOME}/$rcfile") {
+ @sb = stat(_);
safe_do("$ENV{HOME}/$rcfile");
-}
-elsif (defined $ENV{LOGDIR} && -f "$ENV{LOGDIR}/$rcfile") {
+ }
+ elsif (defined $ENV{LOGDIR} && -f "$ENV{LOGDIR}/$rcfile") {
+ @sb = stat(_);
safe_do("$ENV{LOGDIR}/$rcfile");
-}
+ }
+ if (-f $rcfile) {
+ if (@sb && $sb[0] != (stat _)[0] && $sb[1] != (stat _)[1]) {
+ safe_do("./$rcfile");
+ }
+ }
+
+}
if (defined $ENV{PERLDB_OPTS}) {
parse_options($ENV{PERLDB_OPTS});
} |
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How long has it been, dear god. |
|
On Fri, Mar 08, 2024 at 05:07:30PM -0800, dao.rixing wrote:
How long has it been, dear god.
How long has *what* been? What exactly are you trying to contribute to, or
a complain about, in relation to this long-closed ticket?
…--
All wight. I will give you one more chance. This time, I want to hear
no Wubens. No Weginalds. No Wudolf the wed-nosed weindeers.
-- Life of Brian
|
Migrated from rt.perl.org#842 (status was 'resolved')
Searchable as RT842$
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