Lazily compute Iterator len #295
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Dr-Emann
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Kerollmops
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Oct 18, 2024
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Excellent implementation of the option 1. Also, when you said that it is O(n), this n is the number of containers, so it's ok and even only called when calling size_hint, so that's pretty good.
I'm just thinking that when you call collect into a Vec, for example, the implementation will call size_hint 🤔 Anyway, it's still much better.
I let you rebase on main, flatten in a single commit and I'll merge, thank you again! Nice work 👌
This means the price of visting every container is only paid when needed: e.g. when calling `.collect()` This adds more efficent overrides for `count`, `nth` and `nth_back`, and implements `FusedIterator`
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@Kerollmops Believe this is ready |
Kerollmops
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This was referenced Oct 30, 2024
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Lazily compute the length of an iterator, rather than doing so eagerly at creation time.
Additionally, add more efficient implementations of
count,nth, andnth_back.This required somewhat manually reimplementing
std::iter::Flatten, but this is something we'll need to do anyway for #290 / #287.This is currently built on top of #292, (so the PR currently includes commits from that PR too)
Fixes #294