Beefy Boxes and Bandwidth Generously Provided by pair Networks
Clear questions and runnable code
get the best and fastest answer
 
PerlMonks  

Re: Autocreating Classes

by fenLisesi (Priest)
on Oct 07, 2006 at 12:46 UTC ( #576835=note: print w/ replies, xml ) Need Help??


in reply to Autocreating Classes

eval came to my mind (I hope I am not totally missing the point here)

StaticMammal.pm (The equivalent of your A):

#!/usr/bin/perl -wT package StaticMammal; use strict; use warnings; sub new { my ($class) = @_; my $new_critter = bless {}, $class; return $new_critter; } sub walk { my ($self) = @_; print "A " . ref( $self ) . " walks " . $self->walks_how() . "\n"; return; } sub talk { my ($self) = @_; print "A " . ref( $self ) . " says " . $self->talks_how() . "\n"; return; } sub walks_how { return q(ponderously); } sub talks_how { return q(Grrr); } 1; __END__
DynamicMammals.pm (The middleman that generates the equivalent of your Bn):
#!/usr/bin/perl -wT package DynamicMammals; use strict; use warnings; use lib '.'; my %style_of = ( Cat => { talks => q(meow), walks => q(in beauty, like the night), }, Dog => { talks => q(woof), }, FrankenMammal => { ## empty hash }, ); my $package_str = q(); foreach my $mammal (keys %style_of) { $package_str .= qq( package Dynamic$mammal; use base qw(StaticMammal); ); my $action_href = $style_of{ $mammal }; foreach my $action (keys %$action_href) { $package_str .= sprintf q( sub %s_how { return q(%s); } ), $action, $action_href->{ $action}; } } eval $package_str; if (my $msg = $@) { die "Eval error: $msg\nwhile trying to eval:\n$package_str"; } 1; __END__
Something that calls the equivalent of your Bn:
#!/usr/bin/perl -wT use strict; use warnings; use lib '.'; use DynamicMammals; my $felix = DynamicCat->new(); my $spot = DynamicDog->new(); my $thing = DynamicFrankenMammal->new(); foreach my $critter ($felix, $spot, $thing) { $critter->walk(); $critter->talk(); } __END__


Comment on Re: Autocreating Classes
Select or Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://576835]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others studying the Monastery: (9)
As of 2015-07-31 00:21 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (274 votes), past polls