Heap::Elem::Ref(3p)   User Contributed Perl Documentation  Heap::Elem::Ref(3p)



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@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).



perl v5.12.2                      2007-04-28               Heap::Elem::Ref(3p)
