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Document implementing try_fold for iterators for internal iteration #62606

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Document implementing try_fold for iterators for internal iteration #62606

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Document implementing `try_fold` for iterators for internal iteration
czipperz Jul 12, 2019
6c8dbec
Fix typo
czipperz Jul 12, 2019
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7 changes: 4 additions & 3 deletions src/libcore/iter/mod.rs
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Expand Up @@ -141,9 +141,10 @@
//! next.
//!
//! Also note that `Iterator` provides a default implementation of methods such as `nth` and `fold`
//! which call `next` internally. However, it is also possible to write a custom implementation of
//! methods like `nth` and `fold` if an iterator can compute them more efficiently without calling
//! `next`.
//! which call `next` internally. Each of these methods delegates to the `try_fold` implementation.
//! So if you can produce a more efficient custom implementation of iterating over the entire
//! structure, then you can implement `try_fold` and get these other methods to use your iteration
//! strategy.
//!
//! # for Loops and IntoIterator
//!
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