NAME

       Sort::Key::Multi - simple multi-key sorts

SYNOPSIS

           use Sort::Key::Multi qw(sikeysort);
           my @data = qw(foo0 foo1 bar34 bar0 bar34 bar33 doz4)
           my @sisorted = sikeysort { /(\w+)(\d+)/} @data;

DESCRIPTION

       Sort::Key::Multi creates multi-key sorting subroutines and exports them to the caller
       package.

       The names of the sorters are of the form "xxxkeysort" or "xxxkeysort_inplace", where "xxx"
       determines the number and types of the keys as follows:

           + "i" indicates an integer key, "u" indicates an unsigned integer key, "n" indicates a
           numeric key, "s" indicates a string key and "l" indicates a string key that obeys
           locale order configuration.

           + Type characters can be prefixed by "r" to indicate reverse order.

           + A number following a type character indicates that the key type has to be repeated
           as many times (for instance "i3" is equivalent to "iii" and "rs2" is equivalent to
           "rsrs").

           + Underscores ("_") can be freely used between type indicators.

       For instance:

          use Key::Sort::Multi qw(iirskeysort
                                  i2rskeysort
                                  i_i_rs__keysort
                                  i2rs_keysort);

       exports to the caller package fourth identical sorting functions that take two integer
       keys that are sorted in ascending order and one string key that is sorted in descending
       order.

       The generated sorters take as first argument a subroutine that is used to extract the keys
       from the values which are passed inside $_, for example:

         my @data = qw(1.3.foo 1.3.bar 2.3.bar 1.4.bar 1.7.foo);
         my @s = i2rs_keysort { split /\./, $_ } @data;

SEE ALSO

       For a more general multi-key sorter generator see Sort::Key::Maker.

COPYRIGHT AND LICENSE

       Copyright (C) 2006, 2014 by Salvador Fandiño <sfandino@yahoo.com>

       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.