Humm, don't forget that Perl uses a special variable @_ for the arguments. What you can't forget is that this array @_ is global, but it's elements will change for each call. So, the performance of @_ will be similar to a global variable, but will work as a stack, so, will work for multiple calls of the same sub and recursivelly.
This code will show that:
sub test1 {
++$_[0] ;
print "T1 [@_]\n" ;
test2($_[0]) ;
}
sub test2 {
++$_[0] ;
print "T2 [@_]\n" ;
test3($_[0]) ;
}
sub test3 {
++$_[0] ;
print "T3 [@_]\n" ;
print "end\n" ;
}
my $n = 10 ;
test1($n) ;
print "N: $n\n" ;
output:
T1 [11]
T2 [12]
T3 [13]
end
N: 13
And forget the use of a global variable for any type of code and start learning OO. Take a look at perlobj, perltoot, perlboot and perltooc.
For Object Orientation (OO) I use Class::HPLOO.
Graciliano M. P.
"Creativity is the expression of the liberty".
-
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.
|