1Perl6::Junction(3)    User Contributed Perl Documentation   Perl6::Junction(3)
2
3
4

NAME

6       Perl6::Junction - Perl6 style Junction operators in Perl5.
7

SYNOPSIS

9         use Perl6::Junction qw/ all any none one /;
10
11         if (any(@grant) eq 'su') {
12           ...
13         }
14
15         if (all($foo, $bar) >= 10) {
16           ...
17         }
18
19         if (qr/^\d+$/ == all(@answers)) {
20           ...
21         }
22
23         if (all(@input) <= @limits) {
24           ...
25         }
26
27         if (none(@pass) eq 'password') {
28           ...
29         }
30
31         if (one(@answer) == 42) {
32           ...
33         }
34

DESCRIPTION

36       This is a lightweight module which provides 'Junction' operators, the
37       most commonly used being "any" and "all".
38
39       Inspired by the Perl6 design docs,
40       <http://dev.perl.org/perl6/doc/design/exe/E06.html>.
41
42       Provides a limited subset of the functionality of
43       Quantum::Superpositions, see "SEE ALSO" for comment.
44
45       Notice in the "SYNOPSIS" above, that if you want to match against a
46       regular expression, you must use "==" or "!=". Not "=~" or "!~". You
47       must also use a regex object, such as "qr/\d/", not a plain regex such
48       as "/\d/".
49

SUBROUTINES

51   all()
52       Returns an object which overloads the following operators:
53
54         '<',  '<=', '>',  '>=', '==', '!=',
55         'lt', 'le', 'gt', 'ge', 'eq', 'ne',
56
57       Returns true only if all arguments test true according to the operator
58       used.
59
60   any()
61       Returns an object which overloads the following operators:
62
63         '<',  '<=', '>',  '>=', '==', '!=',
64         'lt', 'le', 'gt', 'ge', 'eq', 'ne',
65
66       Returns true if any argument tests true according to the operator used.
67
68   none()
69       Returns an object which overloads the following operators:
70
71         '<',  '<=', '>',  '>=', '==', '!=',
72         'lt', 'le', 'gt', 'ge', 'eq', 'ne',
73
74       Returns true only if no argument tests true according to the operator
75       used.
76
77   one()
78       Returns an object which overloads the following operators:
79
80         '<',  '<=', '>',  '>=', '==', '!=',
81         'lt', 'le', 'gt', 'ge', 'eq', 'ne',
82
83       Returns true only if one and only one argument tests true according to
84       the operator used.
85

ALTERING JUNCTIONS

87       You cannot alter junctions.  Instead, you can create new junctions out
88       of old junctions.  You can do this by calling the "values" method on a
89       junction.
90
91        my $numbers = any(qw/1 2 3 4 5/);
92        print $numbers == 3 ? 'Yes' : 'No';   # Yes
93
94        $numbers = any( grep { $_ != 3 } $numbers->values );
95        print $numbers == 3 ? 'Yes' : 'No';   # No
96

EXPORT

98       'all', 'any', 'none', 'one', as requested.
99
100       All subroutines can be called by its fully qualified name, if you don't
101       want to export them.
102
103         use Perl6::Junction;
104
105         if (Perl6::Junction::any( @questions )) {
106           ...
107         }
108

WARNING

110       When comparing against a regular expression, you must remember to use a
111       regular expression object: "qr/\d/" Not "/d/". You must also use either
112       "==" or "!=". This is because "=~" and "!~" cannot be overriden.
113

TO DO

115       Add overloading for arithmetic operators, such that this works:
116
117         $result = any(2,3,4) * 2;
118
119         if ($result == 8) {...}
120

SUPPORT / BUGS

122       Submit to the CPAN bugtracker <http://rt.cpan.org>
123

SEE ALSO

125       Quantum::Superpositions provides the same functionality as this, and
126       more. However, this module provides this limited functionality at a
127       much greater runtime speed, with my benchmarks showing between 500% and
128       6000% improvment.
129
130       <http://dev.perl.org/perl6/doc/design/exe/E06.html> - "The Wonderful
131       World of Junctions".
132

AUTHOR

134       Carl Franks
135

ACKNOWLEDGEMENTS

137       Thanks to "Curtis "Ovid" Poe" for the "ALTERING JUNCTIONS" changes in
138       release 0.40000.
139

141       Copyright 2005, Carl Franks.  All rights reserved.
142
143       This library is free software; you can redistribute it and/or modify it
144       under the same terms as Perl itself (perlgpl, perlartistic).
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148perl v5.12.0                      2008-06-20                Perl6::Junction(3)
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