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Here is a cleaned-up version of Damian's example, along with a test.

package Astro::Data::Astrological; use strict; use warnings; use base qw( Astro::Data::Scientific ); sub new { my $class = shift; my $self = bless( {}, $class ); return $self; } sub hello { my $self = shift; my $msg = 'Hello, astrologically!'; return $msg; } 1; package Astro::Data::Scientific; use strict; use warnings; sub new { my $class = shift; my $self = bless( {}, $class ); return $self; } sub hello { my $self = shift; my $msg = 'Hello, scientifically!'; return $msg; } sub goodbye { my $self = shift; my $msg = 'Goodbye, anyway'; return $msg; } 1; package Astro::Data; $VERSION = '0.01'; use strict; use warnings; use base qw( Astro::Data::Astrological Astro::Data::Scientific ); sub new { shift; # off class name if (-f "$ENV{HOME}/xyz") { return Astro::Data::Astrological->new(); } else { return Astro::Data::Scientific->new(); } } 1; # t/001_load.t use strict; use warnings; use Test::More # tests => 2; qw(no_plan); use File::Copy; use Carp; BEGIN { use_ok( 'Astro::Data' ); } my $home = "/Users/jimk"; my $obj1 = Astro::Data->new (); isa_ok($obj1, 'Astro::Data::Astrological'); like($obj1->hello, qr/astrologically/, "hello method returned correct string"); like($obj1->goodbye, qr/anyway/, "goodbye method returned correct string"); move ("$home/xyz", "$home/abc") or croak "Unable to rename xyz: $!"; ok( (-f "$home/abc"), "rename first-a"); ok(! (-f "$home/xyz"), "rename first-b"); my $obj2 = Astro::Data->new (); isa_ok($obj2, 'Astro::Data::Scientific'); like($obj2->hello, qr/scientifically/, "hello method returned correct string"); like($obj2->goodbye, qr/anyway/, "goodbye method returned correct string"); move ("$home/abc", "$home/xyz") or croak "Unable to rename abc: $!"; ok( (-f "$home/xyz"), "rename second-a"); ok(! (-f "$home/abc"), "rename second-b");

I hope this example is (a) correct and (b) useful to the next person who wonders about this.

Jim Keenan


In reply to Re^2: Modification of @ISA at run time by jkeenan1
in thread Modification of @ISA at run time by jkeenan1

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