Add Itertools::{sum1, product1}#300
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Uh, I don't know what travis is complaining about |
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Thanks for the contribution! Could you rebase this on master? |
Like fold1, these return Option<T> Some(result) if the iter is nonempty, None otherwise. Allows differentiation between empty iterators and iterators that reduce to neutral elements
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Rebased and reworded the first line of the doc comments for both methods as commands |
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300: Add Itertools::{sum1, product1} r=jswrenn a=Emerentius
This implements `sum1` and `product1` consumers that are like `sum` and `product` except they produce an `Option<T>` with `Some` for nonempty iters and `None` otherwise, just like `fold1`.
That allows one to distinguish between an empty iter and iters that sum/multiply to their neutral element.
Co-authored-by: Emerentius <emerentius@arcor.de>
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This implements
sum1andproduct1consumers that are likesumandproductexcept they produce anOption<T>withSomefor nonempty iters andNoneotherwise, just likefold1.That allows one to distinguish between an empty iter and iters that sum/multiply to their neutral element.