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heap071::elem

Heap071::Elem(3pm)					User Contributed Perl Documentation					Heap071::Elem(3pm)

NAME

       Heap::Elem - Perl extension for elements to be put in Heaps

SYNOPSIS

	 use Heap::Elem::SomeInheritor;

	 use Heap::SomeHeapClass;

	 $elem = Heap::Elem::SomeInheritor->new( $value );
	 $heap = Heap::SomeHeapClass->new;

	 $heap->add($elem);

DESCRIPTION

       This is an inheritable class for Heap Elements.	It provides the interface documentation and some inheritable methods.  Only a child
       classes can be used - this class is not complete.

METHODS

       $elem = Heap::Elem::SomeInheritor->new( [args] );
	   Creates a new Elem.

       $elem->heap( $val ); $elem->heap;
	   Provides a method for use by the Heap processing routines.  If a value argument is provided, it will be saved.  The new saved value is
	   always returned.  If no value argument is provided, the old saved value is returned.

	   The Heap processing routines use this method to map an element into its internal structure.	This is needed to support the Heap methods
	   that affect elements that are not are the top of the heap - decrease_key and delete.

	   The Heap processing routines will ensure that this value is undef when this elem is removed from a heap, and is not undef after it is
	   inserted into a heap.  This means that you can check whether an element is currently contained within a heap or not.  (It cannot be
	   used to determine which heap an element is contained in, if you have multiple heaps.  Keeping that information accurate would make the
	   operation of merging two heaps into a single one take longer - it would have to traverse all of the elements in the merged heap to
	   update them; for Binomial and Fibonacci heaps that would turn an O(1) operation into an O(n) one.)

       $elem1->cmp($elem2)
	   A routine to compare two elements.  It must return a negative value if this element should go higher on the heap than $elem2, 0 if they
	   are equal, or a positive value if this element should go lower on the heap than $elem2.  Just as with sort, the Perl operators <=> and
	   cmp cause the smaller value to be returned first; similarly you can negate the meaning to reverse the order - causing the heap to
	   always return the largest element instead of the smallest.

INHERITING

       This class can be inherited to provide an oject with the ability to be heaped.  If the object is implemented as a hash, and if it can deal
       with a key of heap, leaving it unchanged for use by the heap routines, then the following implemetation will work.

	 package myObject;

	 require Exporter;

	 @ISA = qw(Heap::Elem);

	 sub new {
	     my $self = shift;
	     my $class = ref($self) || $self;

	     my $self = SUPER::new($class);

	     # set $self->{key} = $value;
	 }

	 sub cmp {
	     my $self = shift;
	     my $other = shift;

	     $self->{key} cmp $other->{key};
	 }

	 # other methods for the rest of myObject's functionality

AUTHOR

       John Macdonald, jmm@perlwolf.com

COPYRIGHT

       Copyright 1998-2003, O'Reilly & Associates.

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

SEE ALSO

       Heap(3), Heap::Elem::Num(3), Heap::Elem::NumRev(3), Heap::Elem::Str(3), Heap::Elem::StrRev(3).

perl v5.10.0							    2007-08-11							Heap071::Elem(3pm)

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