use vars
qw($VERSION @ISA @EXPORT @EXPORT_OK);
@ISA = qw(Exporter AutoLoader Heap::Elem);
# Available for export: NumElem (to allocate a new Heap::Elem::Num value)
@EXPORT_OK = qw( NumElem );
# Preloaded methods go here.
$class = ref($class) || $class;
# two slot array, 0 for the numeric value, 1 for use by Heap
my $self = [ shift, undef ];
return bless $self, $class;
sub NumElem
{ # exportable synonym for new
Heap
::Elem
::Num
->new(@_);
@_ ?
($self->[0] = shift) : $self->[0];
@_ ?
($self->[1] = shift) : $self->[1];
return $self->[0] <=> $other->[0];
# Autoload methods go after =cut, and are processed by the autosplit program.
Heap::Elem::Num - Perl extension for Numeric Heap Elements
use Heap::Elem::Num( NumElem );
my $heap = Heap::Fibonacci->new;
while( defined( $elem = $heap->extract_top ) ) {
print "Smallest is ", $elem->val, "\n";
Heap::Elem::Num is used to wrap numeric values into an element
that can be managed on a heap. The top of the heap will have
the smallest element still remaining. (See L<Heap::Elem::NumRev>
if you want the heap to always return the largest element.)
The details of the Elem interface are described in L<Heap::Elem>.
The details of using a Heap interface are described in L<Heap>.
John Macdonald, jmm@perlwolf.com
Copyright 1998-2003, O'Reilly & Associates.
This code is distributed under the same copyright terms as perl itself.
Heap(3), Heap::Elem(3), Heap::Elem::NumRev(3).