[Libre-soc-bugs] [Bug 1094] insndb instruction database visitor-walker is needed

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=1094

--- Comment #102 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
from https://realpython.com/python-metaclasses/:

class VisitorMeta(type):
    def __new__(cls, name, bases, dct):
        x = super().__new__(cls, name, bases, dct)
        x.registry = collections.defaultdict
        return x

class Visitor(metaclass=VisitorMeta): pass
class Visitor2(Visitor): pass

Visitor.registry[5] = 2
Visitor2.registry[9] = 7

print (Visitor.registry)   # {5: 2}
print (Visitor2.registry)   # {9: 7}

ta-daaaaa :)

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