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The std::ranges::fold_left_with_iter and std::ranges::fold_left_first_with_iter are alternative versions of the fold_left algorithms that additionally return the computed end iterator.

This comes in handy in cases where the range is terminated using a sentinel. The computed end iterator can then be re-used and doesn't have to be re-calculated.

Compiler Explorer link: https://compiler-explorer.com/z/rsxK669fe