[PATCH] libstdc++/77645 fix deque and vector xmethods for Python 3

[Jonathan Wakely]

On 19/09/16 17:24 +0000, Joe Buck wrote:
>Python has a distinct integer division operator, "//".  7 // 3 returns the integer 2.

Python 3 does, but Python 2 doesn't have it unless you import it from
__future, and I don't know how far back that works. I don't want to
introduce a fix for Python 3 that breaks it for old systems.

Using a cast is clear and (AFAIK) works with all versions.