debian man page for set::infinite::_recurrence

Query: set::infinite::_recurrence

OS: debian

Section: 3pm

Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar

Set::Infinite::_recurrence(3pm) 			User Contributed Perl Documentation			   Set::Infinite::_recurrence(3pm)

NAME
Set::Infinite::_recurrence - Extends Set::Infinite with recurrence functions
SYNOPSIS
$recurrence = $base_set->_recurrence ( &next, &previous );
DESCRIPTION
This is an internal class used by the DateTime::Set module. The API is subject to change. It provides all functionality provided by Set::Infinite, plus the ability to define recurrences with arbitrary objects, such as dates.
METHODS
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' occurence. 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 ), " "; # 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 ), " "; # 235 print "previous occurence before $x = ", $recurrence->{param}[2]->( $x ), " "; # 234 } { my $x = 234; print "next occurence after $x = ", $recurrence->{param}[0]->( $x ), " "; # 235 print "previous occurence before $x = ", $recurrence->{param}[2]->( $x ), " "; # 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.
CONSTANTS
o INFINITY The "Infinity" value. o NEG_INFINITY The "-Infinity" value.
SUPPORT
Support is offered through the "datetime@perl.org" mailing list. Please report bugs using rt.cpan.org
AUTHOR
Flavio Soibelmann Glock <fglock@gmail.com> The recurrence generation algorithm is based on an idea from Dave Rolsky.
COPYRIGHT
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.
SEE ALSO
Set::Infinite DateTime::Set For details on the Perl DateTime Suite project please see <http://datetime.perl.org>. perl v5.12.4 2011-08-22 Set::Infinite::_recurrence(3pm)
Related Man Pages
datetime::spanset(3pm) - debian
datetime::event::ical(3pm) - debian
datetime::event::recurrence(3pm) - debian
datetime::format::ical(3pm) - debian
datetime::infinite(3pm) - debian
Similar Topics in the Unix Linux Community
file edit help
First occurence from grep
Search file for pattern2 starting from occurence of pattern1
print ODD lines
Create and paste two file into one