Sort::Key::Maker(3) User Contributed Perl Documentation Sort::Key::Maker(3)NAMESort::Key::Maker - multikey sorter creator
SYNOPSYS
# create a function that sorts strings by length:
use Sort::Key::Maker sort_by_length => sub { length $_}, qw(integer);
# create a multikey sort function;
# first key is integer sorted in descending order,
# second key is a string in default (ascending) order:
use Sort::Key::Maker ri_s_keysort => qw(-integer string);
# some sample data...
my @foo = qw(foo bar t too tood mama);
# and now, use the sorter functions previously made:
# get the values on @foo sorted by length:
my @sorted = sort_by_length @foo;
# sort @foo inplace by its length and then by its value:
ri_s_keysort_inplace { length $_, $_ } @foo;
DESCRIPTIONSort::Key::Maker is a pragmatic module that provides an easy to use
interface to Sort::Key multikey sorting functionality.
It creates multikey sorting functions on the fly for any key type
combination and exports them to the caller package.
The key types natively accepted are:
string, str, locale, loc, integer, int,
unsigned_integer, uint, number, num
and support for other types can be added via Sort::Key::Register (or
also via Sort::Key::register_type()).
USAGE
use Sort::Key::Maker foo_sort => @keys;
exports two subroutines to the caller package: "foo_sort (&@)" and
"foo_sort_inplace (&\@)".
Those two subroutines require a sub reference as their first
argument and then respectively, the list to be sorted or an array.
For instance:
use Sort::Key::Maker bar_sort => qw(int int str);
@bar=qw(doo tomo 45s tio);
@sorted = bar_sort { unpack "CCs", $_ } @bar;
# or sorting @bar inplace
bar_sort_inplace { unpack "CCs", $_ } @bar;
use Sort::Key::Maker foo_sort => \&genmultikey, @keys;
when the first argument after the sorter name is a reference to a
subroutine it is used as the multikey extraction function. The
generated sorter functions doesn't require neither accept one,
i.e.:
use Sort::Key::Maker sort_by_length => sub { length $_ }, 'int';
my @sorted = sort_by_length qw(foo goo h mama picasso);
SEE ALSO
Sort::Key, Sort::Key::Register.
Sort::Maker also available from CPAN provides similar functionality.
AUTHOR
Salvador Fandin~o, <sfandino@yahoo.com>
COPYRIGHT AND LICENSE
Copyright (C) 2005 by Salvador Fandin~o
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself, either Perl version 5.8.4 or, at
your option, any later version of Perl 5 you may have available.
perl v5.14.0 2006-05-08 Sort::Key::Maker(3)
