Is There a More Efficient Way to Update Elements in a std::set?

Update Operations in std::set: Addressing the Tediousness

Question:

The update operation in std::set seems cumbersome due to the lack of an in-place modification API. Currently, users resort to finding the element, copying it, updating its value, erasing the original, and reinserting the updated copy. Is there a more efficient approach or should the std::set be overridden with a custom implementation?

Answer:

std::set employs const iterators to maintain its ordered nature. Allowing regular iterators would enable changing item values and potentially disrupting the ordering.

Hence, the idiomatic method to update items in a set is the one you described:

1. Retrieve the element using a const iterator
2. Copy the element
3. Update the copied element's value
4. Erase the original element using the const iterator
5. Reinsert the updated copy

Customizing std::set by creating your own implementation is unnecessary since the current approach is considered the standard way to perform updates in this container.

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