This is pretty clean, put your private stuff into a sub-package and alias that long package path it to a shorter package name at compile time.

(of course these subs won't be able to call imported subs in the parent package without full qualification or inheritance ;-)

use strict;
use warnings;

package X::Y::Z::my;                    # sub package

sub xyz {warn "xyz called" }


package Y::Y::Z;

BEGIN {
    *::my:: = *X::Y::Z::my:: ;          # alias sub package to my::
}

# END {                                 # delete alias at file's end
#     delete $::{"my::"};
# }



my::xyz();


BEGIN {                                 # delete alias here for demo
    delete $::{"my::"};
}

package Other;

my::xyz();                              # fails alias already gone

[download]

C:/Perl_524/bin\perl.exe  d:/exp/local_package.pl 
xyz called at d:/exp/local_package.pl line 6.
Undefined subroutine &my::xyz called at d:/exp/local_package.pl line 3
+0.

[download]

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery FootballPerl is like chess, only without the dice

update

the magic in the BEGIN/END blocks could be done in the importer of a module called with

use  PackageAlias "X::Y:Z::my" => "my" and no PackageAlias "my"

Update

I just realised that Package::Alias already exists, even with a pretty similar interface.

Skipped colons in my example to avoid confusion.

In reply to Re: Making it clearer to say that a sub is defined within current package (package aliasing) by LanX
in thread Making it clearer to say that a sub is defined within current package by bliako

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