Torsten Förtsch schrieb am 27.04.2010 um 11:25:33 (+0200):
> On Tuesday 27 April 2010 10:18:17 Michael Ludwig wrote:
>
> > A lexical variable in Perl is any variable declared with "my",
> > regardless of the scope, which may be file-level. Unlike globals,
> > lexical variables aren't directly accessible from outside the
> > package.
>
> Not quite correct. Consider this:
>
> $ perl -Mstrict -le '
> my $x=10;
> our $y=20;
> {
> package hugo;
>
> print "x=$x"; # references $x outside of package hugo
> print "y=$y"; # references $main::y
Thanks for catching this. Indeed, lexical variables aren't described
in terms of packages, but in terms of lexical scope.
> $x is file-level lexical. It is visible all over the file. The
> embedded package hugo has no influence. Lexical variables are not
> bound to a package but to a lexical scope.
>
> Same with our-variables. C<our> declares the visibility of a variable
> in the current lexical scope.
Variables declared with "our" are a funny hybrid between global
variables, which are attached to a package, and lexical variables,
which are attached to a scope.
--
Michael Ludwig
