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Document that dispatch caching is used

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Łukasz Langa 2013-05-25 22:06:02 +02:00
parent 03020c215a
commit ae76f771fc
1 changed files with 5 additions and 4 deletions
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pep-0443.txt
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@ -216,10 +216,11 @@ of, they are inserted in a predictable order::
<class 'collections.abc.Iterable'>, <class 'collections.abc.Sized'>,
<class 'object'>]
While this mode of operation is significantly slower, no caching is
involved because user code may ``register()`` a new class on an ABC at
any time. In such case, it is possible to create a situation with
ambiguous dispatch, for instance::
While this mode of operation is significantly slower, all dispatch
decisions are cached. The cache is invalidated on registering new
overloads on the generic function or when user code calls ``register()``
on an ABC to register a new virtual subclass. In the latter case, it is
possible to create a situation with ambiguous dispatch, for instance::
>>> from collections import Iterable, Container
>>> class P: