|boolean||Tolerances are always true.|
|numify||Most tolerances numify to undef; see "numify".|
A tolerance stringifies to a short description of itself, generally something
like m < x < n
|equality||A number is equal to a tolerance if it is neither less than nor greater than it. (See below).|
|smart match||Same as equality.|
A number is greater than a tolerance if it is greater than its maximum value.
No number is greater than an or_more tolerance or less than an or_less tolerance.
...or equal to comparisons include the min/max values in the permissible range, as common sense suggests.
A tolerance & a tolerance or number is the intersection of the two ranges.
Intersections allow you to quickly narrow down a set of tolerances to the most
stringent intersection of values.
If the given values have no intersection, () is returned.
An intersection with a normal number will yield that number, if it is within the tolerance.
|tolerance union||A tolerance | a tolerance or number is the union of the two. Unions allow multiple tolerances, whether they intersect or not, to be treated as one. See Number::Tolerant::Union for more information.|
This feature is slighly experimental, but its here.
New tolerance types may be written as subclasses of Number::Tolerant::Type, providing the interface described in its documentation. They can then be enabled or disabled with the following methods:
This method enables the named class, so that attempts to create new tolerances will check against this class. Classes are checked against "validate_plugin" before being enabled. An exception is thrown if the class does not appear to provide the Number::Tolerant::Type interface.
This method will disable the named class, so that future attempts to create new tolerances will not check against this class.
o Extend from_string to cover unions. o Extend from_string to include Number::Range-type specifications. o Allow translation into forms not originally used:
my $range = tolerance(9 => to => 17); my $range_pm = $range->convert_to(plus_minus); $range->stringify_as(plus_minus_pct);
o Create a factory so that you can simultaneously work with two sets of plugins.
This one is very near completion. There will now be two classes that should be used: Number::Tolerant::Factory, which produces tolerances, and Number::Tolerant::Tolerance, which is a tolerance. Both will inherit from N::T, for supporting old code, and N::T will dispatch construction methods to a default factory.
The module Number::Range provides another way to deal with ranges of numbers. The major differences are: N::R is set-like, not range-like; N::R does not overload any operators. Number::Tolerant will not (like N::R) attempt to parse a textual range specification like 1..2,5,7..10 unless specifically instructed to. (The valid formats for strings passed to from_string does not match Number::Range exactly. See TODO.)
The Number::Range code:
$range = Number::Range->new("10..15","20..25");
Is equivalent to the Number::Tolerant code:
$range = Number::Tolerant::Union->new(10..15,20..25);
...while the following code expresses an actual range:
$range = tolerance(10 => to => 15) | tolerance(20 => to => 25);
Thanks to Yuval Kogman and #perl-qa for helping find the bizarre bug that drove the minimum required perl up to 5.8
Thanks to Tom Freedman, who reminded me that this code was fun to work on, and also provided the initial implementation for the offset type.
Ricardo Signes <firstname.lastname@example.org>
o Alexandre Mestiashvili <email@example.com> o Karen Etheridge <firstname.lastname@example.org> o Michael Carman <email@example.com> o Ricardo SIGNES <firstname.lastname@example.org> o Smylers <Smylers@stripey.com>
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.
|perl v5.20.3||NUMBER::TOLERANT (3)||2015-11-01|