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Date: Fri, 20 Nov 2009 22:56:54 +0100
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To: internals@lists.php.net
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Subject: Intervals representation with brackets
From: samuel.roze@gmail.com (Samuel ROZE)

Hello,

I'm working on two classes, Interval and IntervalList which describe
an interval and a list of intervals. These intervals are defined using
the Interval class:

<?php
$interval = new Interval((int) $from, (int) $to);
?>

These intervals can be stored in a list of intervals, using IntervalList:

<?php
$list = new IntervalList();
$list->add($interval_1);
$list->add($interval_2);
?>

IntervalList's functions are:
- inverse(); which returns an IntervalList object
- intersection(); which returns an IntervalList object of intervals
which are contained by every interval of this list.

To be easier, what do you think about:
<?php
// An interval with [ & ]
$interval = [ (int) $from, (int) $to ];
?>

<?php
// A list of intervals
$list = [ $from_1, $to_1] + [$from_2, $to_2] + ... [$from_n, $to_n];
$list_2 = [$from_1, $to_1] + ... + $interval_n;
?>

Regards,
Samuel ROZE.