[Python-Dev] RFC: PEP 445: Add new APIs to customize Python memory allocators

[Victor Stinner]

2013/6/19 Antoine Pitrou <solipsis at pitrou.net>:
> On Wed, 19 Jun 2013 17:24:21 +0200
>> >> Drawback: the caller has to check if the result is 0, or handle the
>> >> error.
>> >
>> > Or you can just call Py_FatalError() if the domain is invalid.
>>
>> I don't like Py_FatalError(), especially when Python is embedded. It's
>> safer to return -1 and expect the caller to check for the error case.
>
> I don't think you need to check for errors. The domain is always one of
> the existing constants, i.e. it should be hard-coded in the source, not
> computed.

Imagine that PyMem_GetBlockAllocator() is part of the stable ABI and
that a new domain is added to Python 3.5. An application is written
for Python 3.5 and is run with Python 3.4: how would the application
notice that PyMem_GetBlockAllocator() does not know the new domain?

"I don't think you need to check for errors."

Do you mean that an unknown domain should be simply ignored?

Victor