pybind/pybind11

There can be only one (enum instance)

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#1177 opened on Nov 9, 2017

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 (6 comments) (4 reactions) (0 assignees)C++ (14,677 stars) (2,005 forks)batch import
bugenhancementhelp wanted

Description

Currently enums compare equal with == but not with is. I think it would be good if enums would be singletons like None instead.

Contributor guide

Tech stack
cpppython
Domain
api
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Understanding of pybind11 enum implementationFamiliarity with Python's object identity
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
35
Research direction
Investigate pybind11's enum handling in the source code, particularly in files like include/pybind11/detail/enums.cpp or similar. Review existing comments on this issue (#1177) for additional requirements and potential pitfalls. Consider the impact on existing code and whether making enums singletons would break backward compatibility.