I think that the code below will do what you want. You do need to make sure that new is called.
{
package Baz;
sub new
{
my $class = shift;
if ($class ne 'Baz') {
if ($class->can('foo') != Baz->can('foo')) {
die "Don't do that $class";
}
}
bless {}, $class;
}
sub foo
{
'foo';
}
sub boo
{
'foo';
}
}
{
package Foo;
our @ISA = 'Baz';
sub foo
{
'Foo';
}
sub boo
{
'Foo';
}
}
{
package Boo;
our @ISA = 'Foo';
sub boo
{
'Boo';
}
}
{
package Goo;
our @ISA = 'Baz';
sub boo
{
'Boo';
}
}
my ($a, $b, $c);
eval {
$a = new Baz;
};
warn $@ if $@;
eval {
$c = new Foo;
};
warn $@ if $@;
eval {
$b = new Boo;
};
warn $@ if $@;
eval {
$b = new Goo;
};
warn $@ if $@;
If you just want to make sure that Baz::foo is being called from code you control you can just do:
$class->Baz::foo();
I can't think of anything that you could do in a BEGIN block that would help with this problem.
-- gam3
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