Reverse Iterator getting invalid upon using erase() on multiset | Together C & C++ | Page 1

languid hound Feb 10, 2024, 9:57 PM

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In the image, I have a multiset and ritr is a reverse iterator. So ritr.base() is a regular iterator which will point at 4. Now if I execute multisetName.erase(ritr.base()) , this is invalidating my ritr iterator as well. What's the work-around for this so that I can keep ritr reverse iterator validated....?

lofty steepleBOT Feb 10, 2024, 9:57 PM

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dusky flame Feb 10, 2024, 10:03 PM

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you need to get the next iterator before you erase. You can post increment your ritr and then erase from the map (ritr.base())then reassign again. Or you can get the next valid itr with the erase function. However ritr.base() is not pointing to 4 though...

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https://en.cppreference.com/w/cpp/container/multiset/erase

cpp/container/multiset/erase

languid hound Feb 10, 2024, 10:19 PM

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dusky flame you need to get the next iterator before you erase. You can post increment your ...

If I dereference ritr.base(), it is printing 4 when *ritr is 3.

dusky flame Feb 10, 2024, 10:20 PM

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oh wait

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its multiset

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nvm

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but wait

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how did you constructor this ritr? ritr.base() returns the iterator from the iterator that it was constructed from. Which is just its forward iterator

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lime heart Feb 11, 2024, 11:29 AM

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languid hound If I dereference ritr.base(), it is printing 4 when *ritr is 3.

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#Reverse Iterator getting invalid upon using erase() on multiset