VERSION
version 1.708SYNOPSIS
use Number::Tolerant;
my $range1 = tolerance(10 => to => 12);
my $range2 = tolerance(14 => to => 16);
my $union = $range1  $range2;
if ($11 == $union) { ... } # this will happen
if ($12 == $union) { ... } # so will this
if ($13 == $union) { ... } # nothing will happen here
if ($14 == $union) { ... } # this will happen
if ($15 == $union) { ... } # so will this
DESCRIPTION
Number::Tolerant::Union is used by Number::Tolerant to represent the union of multiple tolerances. A subset of the same operators that function on a tolerance will function on a union of tolerances, as listed below.METHODS
new
my $union = Number::Tolerant::Union>new(@list_of_tolerances);
There is a "new" method on the Number::Tolerant::Union class, but unions are meant to be created with the "" operator on a Number::Tolerant tolerance.
The arguments to "new" are a list of numbers or tolerances to be unioned.
Intersecting ranges are not converted into a single range, but this may change in the future. (For example, the union of ``5 to 10'' and ``7 to 12'' is not ``5 to 12.'')
options
This method will return a list of all the acceptable options for the union.Overloading
Tolerance unions overload a few operations, mostly comparisons. numification
 Unions numify to undef. If there's a better idea, I'd love to hear it.
 stringification
 A tolerance stringifies to a short description of itself. This is a set of the union's options, parenthesesenclosed and joined by the word ``or''
 equality
 A number is equal to a union if it is equal to any of its options.
 comparison

A number is greater than a union if it is greater than all its options.
A number is less than a union if it is less than all its options.
 union intersection

An intersection ("&") with a union is commutted across all options. In other
words:
(a  b  c) & d ==yields==> ((a & d)  (b & d)  (c & d))
Options that have no intersection with the new element are dropped. The intersection of a constant number and a union yields that number, if the number was in the union's ranges and otherwise yields nothing.
TODO
Who knows. Collapsing overlapping options, probably.AUTHOR
Ricardo Signes <[email protected]>COPYRIGHT AND LICENSE
This software is copyright (c) 2004 by Ricardo Signes.This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.