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Modern C++ idoms and recipes

meshell
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Working with vectors

Remove multiple items from a vector

We looked already at the Erase-Remove Idiom in the Januar 2016 Meeting. The Erase-Remove Idiom is considered the correct way of removing multiple items from a standard library container.

Deleting items from an unsorted vector in $O(1)$

Deleting an element from the middle of an std::vector with the Erase-Remove idiom takes $O(n)$, because the resulting gap must be filled by moving all the items after the gap to the left. This might be expensive if the items are complex and/or very large. If preserving the order of the items is not important, the deletion can be optimized.

Keep std::vector sorted

Sometimes you want a sorted vector to be still sorted after insertion of an element. Try to implement a sorted insertion.

Implement insert_sorted method
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