there isn't any book on Perl 6 objects yet.
My best bet would be to look at the official documentation on objects (https://docs.perl6.org/language/objects) and on the meta-object protocol (https://docs.perl6.org/language/mop).
I do not know what the before/around/after methods do in CLOS, but, judging from the names, you might be able to implement something similar in Perl 6 using phasers: https://docs.perl6.org/language/phasers. Look especially at block phasers: https://docs.perl6.org/language/phasers#Block_Phasers.
In reply to Re: Perl 6 OOP: before and after methods "CLOS style"
by Laurent_R
in thread Perl 6 OOP: before and after methods "CLOS style"
by Anonymous Monk
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