Having got a handle on 'local our', here's an example showing that compared with '\local our'.
#!/usr/bin/env perl
use 5.022;
use warnings;
use feature 'refaliasing';
no warnings 'experimental::refaliasing';
@::data = (1 .. 3);
say "Data before pop_sum: @::data";
say "Sum of data: ", pop_sum(\@::data);
say "Data after pop_sum: @::data";
say '---';
say "Data before pop_sum_ref: @::data";
say "Sum of data: ", pop_sum_ref(\@::data);
say "Data after pop_sum_ref: @::data";
sub pop_sum {
local our @data = @{+shift};
my $total = 0;
say "\tTotal: $total; Data: @data";
while (1) {
$total += pop @data;
say "\tTotal: $total; Data: @data";
last if $#data < 0;
}
return $total;
}
sub pop_sum_ref {
\local our @data = shift;
my $total = 0;
say "\tTotal: $total; Data: @data";
while (1) {
$total += pop @data;
say "\tTotal: $total; Data: @data";
last if $#data < 0;
}
return $total;
}
Output:
Data before pop_sum: 1 2 3
Total: 0; Data: 1 2 3
Total: 3; Data: 1 2
Total: 5; Data: 1
Total: 6; Data:
Sum of data: 6
Data after pop_sum: 1 2 3
---
Data before pop_sum_ref: 1 2 3
Total: 0; Data: 1 2 3
Total: 3; Data: 1 2
Total: 5; Data: 1
Total: 6; Data:
Sum of data: 6
Data after pop_sum_ref:
So, with 'local our', we can do whatever we want with @data and, once local's scope is exited, @::data gets back its previous values. As we'd expect with local.
However, the usefulness of '\local our' in this scenario eludes me.
@::data does not get back its previous values.
Changing
sub pop_sum_ref {
\local our @data = shift;
to
sub pop_sum_ref {
\our @data = shift;
produces exactly the same results.
Perhaps it simply not useful in this scenario.
Perhaps its not operating as intended.
Update:
I've raised a bug report for the \local our issue.
I'll update again when I get a ticket number.
Update2:
Got the ticket:
[perl #125436]
For those wishing to view this, there may be some issues.
I used the perlbug utility, which appeared to run successfully:
Message sent
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I waited about 10 hours, received no automated response, so followed the above advice and emailed directly.
Thunderbird somehow mangled what was sent: multiple instances of
embedding font tags dozens of levels deep.
All you'll initially see is:
"Message body is not shown because it is too large."
If you really want to, you can download the text/html content (31.3k) and view it in a browser.
However, other than my perl -V output, it mostly contains the same content as you'll find in this thread, so there's little point in doing this unless you really are that interested.
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