Don't use an abstract base class; use roles...
{
package IAmNotInYourIsa;
use Moose::Role;
requires 'dothis';
}
{
package My::CGI;
use Moose; with 'IAmNotInYourIsa';
use CGI;
sub dothis { ... my $q = CGI->new ... $q->param ... }
}
My::CGI->isa('IAmNotInYourIsa'); # false
My::CGI->does('IAmNotInYourIsa'); # true!
A good example can be seen in the Ask distribution on CPAN, where there are different implementations for STDIN/STDOUT, Tk, etc, each of which include:
with 'Ask::API';
Ask uses Moo rather than Moose, but the principle is the same.
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'
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