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perl-Set-CrossProduct
perl-Set-CrossProduct.spec
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File perl-Set-CrossProduct.spec of Package perl-Set-CrossProduct
# # spec file for package perl-Set-CrossProduct # # Copyright (c) 2024 SUSE LLC # # All modifications and additions to the file contributed by third parties # remain the property of their copyright owners, unless otherwise agreed # upon. The license for this file, and modifications and additions to the # file, is the same license as for the pristine package itself (unless the # license for the pristine package is not an Open Source License, in which # case the license is the MIT License). An "Open Source License" is a # license that conforms to the Open Source Definition (Version 1.9) # published by the Open Source Initiative. # Please submit bugfixes or comments via https://bugs.opensuse.org/ # %define cpan_name Set-CrossProduct Name: perl-Set-CrossProduct Version: 2.9.0 Release: 0 %define cpan_version 2.009 License: Artistic-1.0 OR GPL-1.0-or-later Summary: Work with the cross product of two or more sets URL: https://metacpan.org/release/%{cpan_name} Source0: https://cpan.metacpan.org/authors/id/B/BR/BRIANDFOY/%{cpan_name}-%{cpan_version}.tar.gz Source1: cpanspec.yml BuildArch: noarch BuildRequires: perl BuildRequires: perl-macros BuildRequires: perl(ExtUtils::MakeMaker) >= 6.64 BuildRequires: perl(Test::More) >= 1 Provides: perl(Set::CrossProduct) = %{version} %undefine __perllib_provides %{perl_requires} %description Given sets S(1), S(2), ..., S(k), each of cardinality n(1), n(2), ..., n(k) respectively, the cross product of the sets is the set CP of ordered tuples such that { <s1, s2, ..., sk> | s1 => S(1), s2 => S(2), .... sk => S(k). } If you do not like that description, how about: Create a list by taking one item from each array, and do that for all possible ways that can be done, so that the first item in the list is always from the first array, the second item from the second array, and so on. If you need to see it: A => ( a, b, c ) B => ( 1, 2, 3 ) C => ( foo, bar ) The cross product of A and B and C, A x B x C, is the set of tuples shown: ( a, 1, foo ) ( a, 1, bar ) ( a, 2, foo ) ( a, 2, bar ) ( a, 3, foo ) ( a, 3, bar ) ( b, 1, foo ) ( b, 1, bar ) ( b, 2, foo ) ( b, 2, bar ) ( b, 3, foo ) ( b, 3, bar ) ( c, 1, foo ) ( c, 1, bar ) ( c, 2, foo ) ( c, 2, bar ) ( c, 3, foo ) ( c, 3, bar ) In code, it looks like this: use v5.26; use Set::CrossProduct; my $cross = Set::CrossProduct->new( { A => [ qw( a b c ) ], B => [ qw( 1 2 3 ) ], C => [ qw( foo bar ) ], } ); while( my $t = $cross->get ) { printf "( %s, %s, %s )\n", $t->@{qw(A B C)}; } If one of the sets happens to be empty, the cross product is empty too. A => ( a, b, c ) B => ( ) In this case, A x B is the empty set, so you'll get no tuples. This module combines the arrays that give to it to create this cross product, then allows you to access the elements of the cross product in sequence, or to get all of the elements at once. Be warned! The cardinality of the cross product, that is, the number of elements in the cross product, is the product of the cardinality of all of the sets. The constructor, 'new', gives you an iterator that you can use to move around the cross product. You can get the next tuple, peek at the previous or next tuples, or get a random tuple. If you were inclined, you could even get all of the tuples at once, but that might be a very large list. This module lets you handle the tuples one at a time. I have found this module very useful for creating regression tests. I identify all of the boundary conditions for all of the code branches, then choose bracketing values for each of them. With this module I take all of the values for each test and create every possibility in the hopes of exercising all of the code. Of course, your use is probably more interesting. :) %prep %autosetup -n %{cpan_name}-%{cpan_version} %build perl Makefile.PL INSTALLDIRS=vendor %make_build %check make test %install %perl_make_install %perl_process_packlist %perl_gen_filelist %files -f %{name}.files %doc Changes examples %license LICENSE %changelog
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