

o 
_recurrence ( \&next, \&previous )
Creates a recurrence set. The set is defined inside a ’base set’.
$recurrence = $base_set>_recurrence ( \&next, \&previous ); The recurrence functions take one argument, and return the ’next’ or the ’previous’ occurrence. Example: defines the set of all ’integer numbers’:
use strict; use Set::Infinite::_recurrence; use POSIX qw(floor); # define the recurrence span my $forever = Set::Infinite::_recurrence>new( Set::Infinite::_recurrence::NEG_INFINITY, Set::Infinite::_recurrence::INFINITY ); my $recurrence = $forever>_recurrence( sub { # next floor( $_[0] + 1 ) }, sub { # previous my $tmp = floor( $_[0] ); $tmp < $_[0] ? $tmp : $_[0]  1 }, ); print "sample recurrence ", $recurrence>intersection( 5, 5 ), "\n"; # sample recurrence 5,4,3,2,1,0,1,2,3,4,5 { my $x = 234.567; print "next occurence after $x = ", $recurrence>{param}[0]>( $x ), "\n"; # 235 print "previous occurence before $x = ", $recurrence>{param}[2]>( $x ), "\n"; # 234 } { my $x = 234; print "next occurence after $x = ", $recurrence>{param}[0]>( $x ), "\n"; # 235 print "previous occurence before $x = ", $recurrence>{param}[2]>( $x ), "\n"; # 233 } 
o 
is_forever
Returns true if the set is a single span, ranging from Infinity to Infinity. 
o 
_is_recurrence
Returns true if the set is an unbounded recurrence, ranging from Infinity to Infinity. 
o INFINITY The Infinity value.
o NEG_INFINITY The Infinity value.
Support is offered through the datetime@perl.org mailing list.Please report bugs using rt.cpan.org
Flavio Soibelmann Glock <fglock@gmail.com>The recurrence generation algorithm is based on an idea from Dave Rolsky.
Copyright (c) 2003 Flavio Soibelmann Glock. All rights reserved. This program is free software; you can distribute it and/or modify it under the same terms as Perl itself.The full text of the license can be found in the LICENSE file included with this module.
Set::InfiniteDateTime::Set
For details on the Perl DateTime Suite project please see <http://datetime.perl.org>.
perl v5.20.3  SET::INFINITE::_RECURRENCE (3)  20151111 
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