From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: 02 March 2007 16:29
To: activeperl@listserv.ActiveState.com
Subject: exiting an eval block inside a loop?
> Gurus,
>
> I've looked in the Camel and Leopard, and they're mum on this topic.
Is it possible/permitted to exit an eval > block that's running inside a
loop, or will that break something? Quickie example code:
>
> LABEL: until ($foo eq q{}) {
> $foo = $array{$ndx++};
>
> eval {
> for ($foo) {
> /^abc/o && do {
> next LABEL if ($_ =~ /ZZZ$/); # CAN I DO THIS?
> # do something
> };
> /^def/o && do {
> next LABEL if ($_ =~ /RST$/);
> # do something else
> };
> }
> };
> $@ and die "Error in string value";
> }
The documentation ('perldoc -f eval') addresses this issue to some
extent. The second from last paragraph (on my installation, at least)
discusses this.
However, you could also have just tried it (the suck-it-and-see approach
is one of the things that Perl is good at). If you did you would have
seen the warning that it causes (you do have warnings enabled, don't
you). You can inhibit the warning (see following example), but it is
better to avoid code that generates warnings as far as possible. If you
really must do it, please make sure that you document what you are doing
and why.
------------------------------------
use strict;
use warnings;
for my $i (1..10) {
# Try with and without the following statement.
no warnings qw{exiting};
eval {
print "i=$i\n";
next;
print "bottom of loop\n";
};
die $@ if $@;
}
------------------------------------
HTH
--
Brian Raven
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