From: Elizabeth Mattijsen Date: Tue, 18 Jun 2002 13:37:30 +0000 (+0200) Subject: [DOC PATCH] perlsyn X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=7bd1983cd402d3e9e5a5cab9e3e1ad2a4342c647;p=p5sagit%2Fp5-mst-13.2.git [DOC PATCH] perlsyn Date: Tue, 18 Jun 2002 13:37:30 +0200 Message-ID: <4.2.0.58.20020618133610.01956d30@mickey.dijkmat.nl> Subject: Re: [DOC PATCH] perlsyn (2) From: Elizabeth Mattijsen Date: Tue, 18 Jun 2002 15:08:17 +0200 Message-ID: <4.2.0.58.20020618150341.01798100@mickey.dijkmat.nl> (Plus tweak by Ronald J Kimball) p4raw-id: //depot/perl@17283 --- diff --git a/pod/perlsyn.pod b/pod/perlsyn.pod index 8f1af95..efb8d8a 100644 --- a/pod/perlsyn.pod +++ b/pod/perlsyn.pod @@ -34,8 +34,18 @@ C<"">; and when used as a reference that isn't being assigned to, it is treated as an error. If you enable warnings, you'll be notified of an uninitialized value whenever you treat C as a string or a number. Well, usually. Boolean ("don't-care") -contexts and operators such as C<++>, C<-->, C<+=>, C<-=>, and -C<.=> are always exempt from such warnings. +contexts, such as: + + my $a; + if ($a) {} + +are exempt from warnings. Operators such as C<++>, C<-->, C<+=>, +C<-=>, and C<.=>, that operate on undefined left values such as: + + my $a; + $a++; + +are also always exempt from such warnings. A declaration can be put anywhere a statement can, but has no effect on the execution of the primary sequence of statements--declarations all @@ -254,11 +264,14 @@ The loop control statements don't work in an C or C, since they aren't loops. You can double the braces to make them such, though. if (/pattern/) {{ - next if /fred/; - next if /barney/; - # so something here + last if /fred/; + next if /barney/; # same effect as "last", but doesn't document as well + # do something here }} +This is caused by the fact that a block by itself acts as a loop that +executes once, see L<"Basic BLOCKs and Switch Statements">. + The form C, available in Perl 4, is no longer available. Replace any occurrence of C by C.