dir structure looks like... lib/B.pm ... lib/C/C1.pm ...
As previously stated, B.pm will already exist on your system. Attempting to write new code with "package B;" will cause you all sorts of problems. You should avoid this name.
That's fine. The class name will become "C::C1". My previously posted "lib/C1.pm" should be moved to "lib/C/C1.pm", and the first line should be changed to:package C::C1;
In my "./acd.pl", you should changeuse C1; my $c1 = C1::->new();
touse C::C1; my $c1 = C::C1::->new();
After making those changes, note the difference in the last line:$ ./acd.pl A=HASH(0x9897d0) A-bar D=HASH(0x989890) D-bar whos_who() is in package: C $self is in package: C::C1
The hexadecimal values in "X=HASH(0xhhhhhh)" will likely be different: that's not significant; you could get different values on separate runs using the same code.