Well, technically what is happening is not violating Camel III.
See, it *does* get its own scratchpad, which can be quickly
checked by:
#!/opt/perl/bin/perl -w
use strict;
sub foo;
sub foo {
return unless $_ [0];
my $x if 0;
print ++ $x, " ";
foo $_ [0] - 1;
}
foo 1; print "\n";
foo 2; print "\n";
foo 3; print "\n";
foo 4; print "\n";
__END__
1
2 1
3 2 1
4 3 2 1
Scary, isn't? When the subroutine recurses, it notices there is still
a reference to $x and hence it will create a new
scratchpad. But when there is no reference, it will reuse an old
scratchpad....
I do agree that using my in this way doesn't tend to lead
to well understood code. I wouldn't go as far as to say it's never
useful, but such cases will be very rare and it's not a technique I
would teach in my classes.
-- Abigail
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|