1Number::Tolerant::UnionU(s3e)r Contributed Perl DocumentaNtuimobner::Tolerant::Union(3)
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NAME

6       Number::Tolerant::Union - unions of tolerance ranges
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VERSION

9       version 1.709
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SYNOPSIS

12        use Number::Tolerant;
13
14        my $range1 = tolerance(10 => to => 12);
15        my $range2 = tolerance(14 => to => 16);
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17        my $union = $range1 | $range2;
18
19        if ($11 == $union) { ... } # this will happen
20        if ($12 == $union) { ... } # so will this
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22        if ($13 == $union) { ... } # nothing will happen here
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24        if ($14 == $union) { ... } # this will happen
25        if ($15 == $union) { ... } # so will this
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DESCRIPTION

28       Number::Tolerant::Union is used by Number::Tolerant to represent the
29       union of multiple tolerances.  A subset of the same operators that
30       function on a tolerance will function on a union of tolerances, as
31       listed below.
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PERL VERSION

34       This library should run on perls released even a long time ago.  It
35       should work on any version of perl released in the last five years.
36
37       Although it may work on older versions of perl, no guarantee is made
38       that the minimum required version will not be increased.  The version
39       may be increased for any reason, and there is no promise that patches
40       will be accepted to lower the minimum required perl.
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METHODS

43   new
44         my $union = Number::Tolerant::Union->new(@list_of_tolerances);
45
46       There is a "new" method on the Number::Tolerant::Union class, but
47       unions are meant to be created with the "|" operator on a
48       Number::Tolerant tolerance.
49
50       The arguments to "new" are a list of numbers or tolerances to be
51       unioned.
52
53       Intersecting ranges are not converted into a single range, but this may
54       change in the future.  (For example, the union of "5 to 10" and "7 to
55       12" is not "5 to 12.")
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57   options
58       This method will return a list of all the acceptable options for the
59       union.
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61   Overloading
62       Tolerance unions overload a few operations, mostly comparisons.
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64       numification
65           Unions numify to undef.  If there's a better idea, I'd love to hear
66           it.
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68       stringification
69           A tolerance stringifies to a short description of itself.  This is
70           a set of the union's options, parentheses-enclosed and joined by
71           the word "or"
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73       equality
74           A number is equal to a union if it is equal to any of its options.
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76       comparison
77           A number is greater than a union if it is greater than all its
78           options.
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80           A number is less than a union if it is less than all its options.
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82       union intersection
83           An intersection ("&") with a union is commutted across all options.
84           In other words:
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86            (a | b | c) & d  ==yields==> ((a & d) | (b & d) | (c & d))
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88           Options that have no intersection with the new element are dropped.
89           The intersection of a constant number and a union yields that
90           number, if the number was in the union's ranges and otherwise
91           yields nothing.
92

TODO

94       Who knows.  Collapsing overlapping options, probably.
95

AUTHOR

97       Ricardo Signes <rjbs@semiotic.systems>
98

100       This software is copyright (c) 2004 by Ricardo Signes.
101
102       This is free software; you can redistribute it and/or modify it under
103       the same terms as the Perl 5 programming language system itself.
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107perl v5.34.1                      2022-05-30        Number::Tolerant::Union(3)
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