Glen Walker f45bb585c3 Support keep_alive where nurse may be None ...

For example keep_alive<0,1>() should work where the return value may sometimes be None. At present a "Could not allocate weak reference!" exception is thrown.
Update documentation to clarify behaviour of keep_alive when nurse is None or does not support weak references.

2016-08-18 09:09:41 +12:00

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pybind11

Support keep_alive where nurse may be None

2016-08-18 09:09:41 +12:00