phpman > perldoc > Heap::Elem::Ref(3pm)

NAME
    Heap::Elem::Ref - Object Reference Heap Elements

SYNOPSIS
      use Heap::Elem::Ref( RefElem );
      use Heap::Fibonacci;

      my $heap = Heap::Fibonacci->new;
      my $elem;

      foreach $i ( 1..100 ) {
          $obj = myObject->new( $i );
          $elem = RefElem( $obj );
          $heap->add( $elem );
      }

      while( defined( $elem = $heap->extract_top ) ) {
          # assume that myObject object have a method I<printable>
          print "Smallest is ", $elem->val->printable, "\n";
      }

DESCRIPTION
    Heap::Elem::Ref is used to wrap object reference values into an element that can be managed on a
    heap. Each referenced object must have a method *cmp* which can compare itself with any of the
    other objects that have references on the same heap. These comparisons must be consistant with
    normal arithmetic. The top of the heap will have the smallest (according to *cmp*) element still
    remaining. (See Heap::Elem::RefRev if you want the heap to always return the largest element.)

    The details of the Elem interface are described in Heap::Elem.

    The details of using a Heap interface are described in Heap.

AUTHOR
    John Macdonald, john AT perlwolf.com

COPYRIGHT
    Copyright 1998-2007, O'Reilly & Associates.

    This code is distributed under the same copyright terms as perl itself.

SEE ALSO
    Heap(3), Heap::Elem(3), Heap::Elem::RefRev(3).