I'm guessing the braces localize what I'm doing, so once outside them, I can do whatever I want.

Be careful. The braces ({}) don't localize everything you are doing. The create a scope for your variables, but your package and subroutine declarations remain global. I think the form you used above gives a misleading impression that the package is block scoped.

Update 2: Thanks for the heaping helping of crow, ikegami--I needed it. I was wrong. Dead wrong. See package. I read this wrong information somewhere, failed to check it, and have promulgated bogus information as a result.

{   package Foo;
    # Foo stuff
    # goes in here.
}
sub FooFunc {
    # This function is Foo::FooFunc!
    #actually it's not!  It is in main.  I was wrong.
}

package main;
sub MainFunc {
    # This function is main::MainFunc.
}
[download]

That's the reason why I like this approach better:

package Foo;
{    # Foo stuff
     # goes in here.
}


package main;

# back in main.
[download]

Update: After looking at the module, I'd be inclined to use ikegami's suggestion for using a localized override.

This will minimize the spooky action at a distance factor.

#!/usr/bin/perl
use strict;
use warnings;

package Foo;

sub method {
    routine();
}

sub routine {
    return __PACKAGE__;
}


package Foo::Bar;
our @ISA = qw( Foo );

sub routine {
    return __PACKAGE__;
}

sub method {
    no warnings 'redefine';
 
    # Temporarily override routine() in the parent class.
    local *Foo::routine = \&routine;
    
    # Delegate to parent method.
    my $self = shift;
    $self->SUPER::method(@_);
}

package main;
print "Foo:      ", Foo->method, "\n";
print "Foo::Bar: ", Foo::Bar->method, "\n";
print "Foo:      ", Foo->method, "\n";
[download]

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