# phpman > man > Heap::Elem::RefRev(3pm)

## NAME
    [Heap::Elem::RefRev](https://www.chedong.com/phpMan.php/perldoc/Heap%3A%3AElem%3A%3ARefRev/markdown) - Reversed Object Reverence Heap Elements

## SYNOPSIS
      use [Heap::Elem::RefRev](https://www.chedong.com/phpMan.php/perldoc/Heap%3A%3AElem%3A%3ARefRev/markdown)( RefRElem );
      use [Heap::Fibonacci](https://www.chedong.com/phpMan.php/perldoc/Heap%3A%3AFibonacci/markdown);

      my $heap = [Heap::Fibonacci](https://www.chedong.com/phpMan.php/perldoc/Heap%3A%3AFibonacci/markdown)->new;
      my $elem;

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

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

## DESCRIPTION
    [Heap::Elem::RefRev](https://www.chedong.com/phpMan.php/perldoc/Heap%3A%3AElem%3A%3ARefRev/markdown) 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 largest (according to *cmp*) element
    still remaining. (See [Heap::Elem::Ref](https://www.chedong.com/phpMan.php/perldoc/Heap%3A%3AElem%3A%3ARef/markdown) if you want the heap to always return the smallest
    element.)

    The details of the Elem interface are described in [Heap::Elem](https://www.chedong.com/phpMan.php/perldoc/Heap%3A%3AElem/markdown).

    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)](https://www.chedong.com/phpMan.php/man/Heap/3/markdown), Heap::[Elem(3)](https://www.chedong.com/phpMan.php/man/Elem/3/markdown), [Heap::Elem](https://www.chedong.com/phpMan.php/perldoc/Heap%3A%3AElem/markdown)::[Ref(3)](https://www.chedong.com/phpMan.php/man/Ref/3/markdown).