QUESTION: should i hold iterator or pointer to element

[LeGamerDc]

Say i would like to keep a reference(iterator or pointer) to a element in somewhere，when i use it later, how would i know where it's still valid or invalid (like erased and then insert in same place?)

[mattreecebentley]

Use get_iterator if it's a pointer, use is_active if it's an iterator. This will only tell you if an element exists in that location, not if it's the same element. Use a unique id within the element if you want to guarantee that it's the same element. If you like you can create a wrapper around an iterator which stores the id and compares.
Please send questions over email, the issues format is only really for issues with the implementation, not for Q&A.
Thanks