Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl-Sensitive Sunglasses

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

As you say, programming like this probably causes some maintenance problems. Having said that, you should look at UNIVERSAL::isa()

Your test of $invokant also won't work if called by a class inheriting from MyClass:

package MyClass; sub new { print shift; } package MySubClass; @MySubClass::ISA = qw(MyClass); package main my $test = new MySubClass; __DATA__ prints "MySubClass"

So having said that, I probably would write the constructor like this:

sub _new_or_old { my $invokant = shift; defined( $invokant ) or return undef; if( UNIVERSAL::isa($invokant, 'MyClass' ) { return $invokant; } else { my $self = {}; bless( $self, $invokant ); return $self; } }
___ Simon Flack ($code or die)
$,=reverse'"ro_';s,$,\$,;s,$,lc ref sub{},e;$,
=~y'_"' ';eval"die";print $_,lc substr$@,0,3;

In reply to Re: Multiple "constructors", possible to call several. by $code or die
in thread Multiple "constructors", possible to call several. by Dog and Pony

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • 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 or How to display code and escape characters are good places to start.
Log In?

What's my password?
Create A New User
Domain Nodelet?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others examining the Monastery: (4)
As of 2022-08-13 03:52 GMT
Find Nodes?
    Voting Booth?

    No recent polls found