[PATCH 1 of 3] extensions: introduce a class interposition function

Pierre-Yves David pierre-yves.david at logilab.fr
Wed Nov 21 03:29:19 CST 2012

On Tue, Nov 20, 2012 at 02:55:43PM -0800, Bryan O'Sullivan wrote:
> # HG changeset patch
> # User Bryan O'Sullivan <bryano at fb.com>
> # Date 1353452136 28800
> # Node ID cbf274dc847b5c28a282ae98a7d8b9bd48b6137d
> # Parent  4ae21a7568f353dcb781df28d2acf458b06afcad
> extensions: introduce a class interposition function
> This allows an existing class to be augmented in a transparent way,
> without its subclasses or callers needing to participate.
> The manual class override mechanism currently in use introduces
> names into an outer scope that can be accidentally (and incorrectly)
> used in monkeypatched classes. It also does not make clear which
> class is intended to be monkeypatched. Finally, it requires explicit
> support from the to-be-monkeypatched code (e.g. reposetup).

I'm a afraid this will result in side effect when multiple repository are
involved. FUJIWARA Katsunori spend a lot of time ensuring that enabling and
extension in one repo won't affect other repository involved in the same

(But cleaning up the wrapping is a good idea)

Pierre-Yves David


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