[Python-Dev] Proposal for C++ metaclasses (original) (raw)

Guido van Rossum guido at python.org
Tue Jun 27 12:54:14 EDT 2017

Heh, I'm not totally surprised -- I took Python's metaclass design from a book named Putting Metaclasses to Work, by Ira R. Forman and Scott H. Danforth ( https://www.amazon.com/Putting-Metaclasses-Work-Ira-Forman/dp/0201433052). The book describes a custom metaclass extension to C++ supporting metaclasses, from which I took everything I could given that Python is a dynamic language (the key thing I left out was automatic synthesis of combined metaclasses when multiple inheritance sees two unrelated metaclasses). Hopefully the authors get some credit in the current C++ standard proposal.

On Tue, Jun 27, 2017 at 7:36 AM, Steve Dower <steve.dower at python.org> wrote:

Thought this might be interesting for those of us who live deeper in the language than most – this is the formal proposal to add metaclasses to C++.

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0707r0.pdf Given the differences between Python and C++, it’s obviously got a different approach, though I am struck by the similarities. I think it’s also a good presentation on the value and use of metaclasses, so likely also interesting for those of us who occasionally teach or explain the concept. Cheers, Steve

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