Nash wrote:
Hi all,
I'm new to Perl and I'm trying to use it to connect to a shared disc
through a home network. This is what I've tried:
#!/usr/bin/perl -w
use
Hi,
I wonder what idioms are available to loop through
the lines stored in a scalar variable. I guess I'm
looking for something analogous to these idioms
for files and arrays respectively:
while(FH) {
# do stuff
}
foreach (@array) {
# do stuff
}
When I had to do this I split the scalar in an
hi,
iirc, in C if I store somwhere a pointer to a stack value (e.g.:
call a function with an auto variable, return its pointer) i know i'm
going to mess things, since that piece of data will be most probably
overwritten by subsequent calls.
if I do the same in Perl (with a hard ref), do I have
On Dec 31, 2007 5:56 PM, Jean-Rene David [EMAIL PROTECTED] wrote:
Hi,
I wonder what idioms are available to loop through
the lines stored in a scalar variable. I guess I'm
looking for something analogous to these idioms
for files and arrays respectively:
while(FH) {
# do stuff
}
On Dec 31, 2007 2:56 PM, Jean-Rene David [EMAIL PROTECTED] wrote:
When I had to do this I split the scalar in an
array:
@array = split \n, $scalar;
foreach (@array) {
# do stuff
}
What would be some other ways to do this? (This is
purely curiosity.)
This type of curiosity would be well
You can skip the array assignment and just do:
foreach ( split \n, $scalar ) {
...
}
I predict a reply that uses map()... though I think that using a map
isn't really another solution, but just an alternative to the for
loop.
map {stuff}, split \n, $scalar;
But I think the answer is basically
On Dec 31, 2007 2:43 PM, gst [EMAIL PROTECTED] wrote:
iirc, in C if I store somwhere a pointer to a stack value (e.g.:
call a function with an auto variable, return its pointer) i know i'm
going to mess things, since that piece of data will be most probably
overwritten by subsequent calls.
IIRC, the stack pointer is part of the operating system, not the C language.
When a subroutine is called, the parameters are pushed to the stack,
and the return value is stored in a specific register.
When a routine creates a variable, the system's memory allocator finds
a new piece of unused
On Dec 31, 2007 5:43 PM, gst [EMAIL PROTECTED] wrote:
hi,
iirc, in C if I store somwhere a pointer to a stack value (e.g.:
call a function with an auto variable, return its pointer) i know i'm
going to mess things, since that piece of data will be most probably
overwritten by subsequent
On Jan 1, 2008 2:12 PM, Chas. Owens [EMAIL PROTECTED] wrote:
snip
if I do the same in Perl (with a hard ref), do I have any guarantee
that the same behavior (implicit aliasing) does - or does not (every
new scalar is guaranteed to not alias the old non existant value) -
apply?
snip
Saying
On Mon, 31 Dec 2007 14:43:44 -0800, gst wrote:
iirc, in C if I store somwhere a pointer to a stack value (e.g.:
call a function with an auto variable, return its pointer) i know i'm
going to mess things, since that piece of data will be most probably
overwritten by subsequent calls.
if I do
On Jan 1, 2008 2:32 PM, Chas. Owens [EMAIL PROTECTED] wrote:
snip
You can deal with this by using the anonymous arrayref generator:
snip
Oh, the proper term is anonymous array composer (at least according
to the 3rd Camel). I knew anonymous arrayref generator sounded
wrong.
--
To unsubscribe,
Jean-Rene David wrote:
Hi,
I wonder what idioms are available to loop through
the lines stored in a scalar variable. I guess I'm
looking for something analogous to these idioms
for files and arrays respectively:
while(FH) {
# do stuff
}
foreach (@array) {
# do stuff
}
When I had to do this I
Jean-Rene David wrote:
Hi,
Hello,
I wonder what idioms are available to loop through
the lines stored in a scalar variable. I guess I'm
looking for something analogous to these idioms
for files and arrays respectively:
while(FH) {
# do stuff
}
open FH, '', \$scalar or die Cannot open
From: gst [EMAIL PROTECTED]
iirc, in C if I store somwhere a pointer to a stack value (e.g.:
call a function with an auto variable, return its pointer) i know i'm
going to mess things, since that piece of data will be most probably
overwritten by subsequent calls.
if I do the same in Perl
On Jan 1, 2008 12:21 PM, yitzle [EMAIL PROTECTED] wrote:
You can skip the array assignment and just do:
foreach ( split \n, $scalar ) {
...
}
I predict a reply that uses map()... though I think that using a map
isn't really another solution, but just an alternative to the for
loop.
map
On Mon, Dec 31, 2007 at 02:43:44PM -0800, gst wrote:
hi,
iirc, in C if I store somwhere a pointer to a stack value (e.g.:
call a function with an auto variable, return its pointer) i know i'm
going to mess things, since that piece of data will be most probably
overwritten by subsequent
On Mon, Dec 31, 2007 at 05:56:35PM -0500, Jean-Rene David wrote:
I wonder what idioms are available to loop through
the lines stored in a scalar variable. I guess I'm
looking for something analogous to these idioms
for files and arrays respectively:
while(FH) {
# do stuff
}
foreach
Chas. Owens wrote:
If you have a recent enough version of Perl* you can say
open my $fh, , \$scalar
or die could not attach a file handle to \$scalar: $!;
while (my $line = $fh) {
chomp($line);
#do stuff with $line
}
* 5.8 can do this, but I am not sure about 5.6.*
perldoc -f
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