You can get around that by simply declaring $func as an undefined lexical and then re-defining it as a subroutine. Since the recursive call doesn't get executed until the sub is called for the first time, by that time, $func will contain the code reference. For example,
my $fac;
$fac = sub {
my ( $n ) = @_;
return 1 if $n == 1;
return $n * $fac->( $n - 1 );
};
print $fac->( 5 );
Yes, I know factorials are a bad example for recursion; it's just the first thing that came to mind. :)
-
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.
|