Message 183591 - Python tracker

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Some customizable memory allocators I know have an extra parameter "void *opaque" that is passed to all functions:

- in zlib: zalloc and zfree: http://www.zlib.net/manual.html#Usage
- same thing for bz2.
- lzma's ISzAlloc: http://www.asawicki.info/news_1368_lzma_sdk_-_how_to_use.html
- Oracle's OCI: http://docs.oracle.com/cd/B10501_01/appdev.920/a96584/oci15re4.htm

OTOH, expat, libxml, libmpdec don't have this extra parameter.