not to keep references to the objects from this iterator ?

2016年3月2日 -  Be careful not to keep references to the objects from this iterator.To improve GC performance the same object is re-used in next(). 请问这...

How do I refer to the current object in an iterator

<iterator> - C++ Reference

Are references to not-quite-objects legal? - comp.std.c++

the python documentation

[Python-ideas] Keep free list of popular iterator objects

Iterator - Wikipedia

not to keep references to the objects ...的中文翻译_百度翻译