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Re: How do I make a constructor?

by jamesduncan (Novice)
on Apr 08, 2003 at 11:34 UTC ( [id://248886]=note: print w/replies, xml ) Need Help??


⭐ in reply to How do I make a constructor?

I tend to use: 
sub new {
  my $class = shift;
  my $self = {};
  if (bless( $self, $class)->init( @_ )) {
    return $self;
  } else {
    # throw some sort of error
  }
}

sub init { 1; }

[download]
That way all subclasses can initialize themselves in a standard way with something along the lines of: 
sub init {
  my $self = shift;
  if ($self->SUPER::init( @_ )) {
    ## do some sort of initialization
    ## or return false
    return 1;
  } else {
    return 0;
  }
}

[download]
and I'll know if something goes wrong...

Replies are listed 'Best First'.
Re: Answer: How do I make a constructor? (different responsibilities)
by Aristotle (Chancellor) on Apr 13, 2003 at 12:51 UTC
    I'd be inclined to write that as follows: 
    sub new {
    return (bless {}, shift)->init(@_);
}

sub init {
    my $self = shift;
    $self->SUPER::init(@_);

    1 # put stuff to initialize here
        or die "Failed to init $self: blah blah\n";

    return $self;
}

    [download]

    Makeshifts last the longest.

[reply]
[d/l]

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