> we certainly should not call them "private" because that has an established, widely understood meaning which is different from what these variables are. I refer to private members of classes in OO languages such as C++ and Java.

I'm neither an expert on C++ nor Java.

Could you please explain the semantic difference to this demo of private methods achieved with my ?

use strict;
use warnings;
use 5.10.0;


# ========================================
#          class definition
# ========================================

{
    package Class;

    use Carp qw/cluck/;
    use Data::Dump qw/pp dd/;

    # ----- constructor

    sub new {
        my ($class,@init)=@_;

        return bless {@init}, $class;
    }

    # ----- private methods

    my $private = sub {
        my ($self) = @_;

        cluck "I'm a PRIVATE METHOD of OBJ= " . pp $self ;
    };


    # ----- public methods
    sub public {
        my ($self) = @_;

        cluck "I'm a PUBLIC METHOD of OBJ= " . pp $self ;
        warn " ... calling private methods...\n";

        $self->$private();
    }

}



# ========================================
#                 demo
# ========================================

package main;

my $obj = Class->new( ID => 1 );
my $obj2 = Class->new( ID => 2 );

$obj->public;
$obj2->public;



$obj->private;       # fails
#$obj->$private;     # doesn't compile
[download]

-*- mode: compilation; default-directory: "d:/tmp/pm/" -*-
Compilation started at Sat Dec 19 16:53:21

C:/Perl_524/bin\perl.exe -w d:/tmp/pm/private_method.pl 
I'm a PUBLIC METHOD of OBJ= bless({ ID => 1 }, "Class") at d:/tmp/pm/p
+rivate_method.pl line 37.
    Class::public(Class=HASH(0x1cc1e0)) called at d:/tmp/pm/private_me
+thod.pl line 56
 ... calling private methods...
I'm a PRIVATE METHOD of OBJ= bless({ ID => 1 }, "Class") at d:/tmp/pm/
+private_method.pl line 29.
    Class::__ANON__(Class=HASH(0x1cc1e0)) called at d:/tmp/pm/private_
+method.pl line 40
    Class::public(Class=HASH(0x1cc1e0)) called at d:/tmp/pm/private_me
+thod.pl line 56
I'm a PUBLIC METHOD of OBJ= bless({ ID => 2 }, "Class") at d:/tmp/pm/p
+rivate_method.pl line 37.
    Class::public(Class=HASH(0x1cc0d8)) called at d:/tmp/pm/private_me
+thod.pl line 57
 ... calling private methods...
I'm a PRIVATE METHOD of OBJ= bless({ ID => 2 }, "Class") at d:/tmp/pm/
+private_method.pl line 29.
    Class::__ANON__(Class=HASH(0x1cc0d8)) called at d:/tmp/pm/private_
+method.pl line 40
    Class::public(Class=HASH(0x1cc0d8)) called at d:/tmp/pm/private_me
+thod.pl line 57
Can't locate object method "private" via package "Class" at d:/tmp/pm/
+private_method.pl line 61.

Compilation exited abnormally with code 255 at Sat Dec 19 16:53:22
[download]

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