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