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Обсуждение на тему: Rust iter
Rust iter
If a collection type c provides iter(), it usually also implements intoiterator for &c, with an implementation that just calls iter(). Likewise, a collection c that provides itermut() generally implements intoiterator for &mut c by delegating to itermut(). This enables a convenient shorthand итератор хранится в переменной v1iter. В листинге 3-5 главы 3 мы совершали обход элементов массива используя цикл for для выполнения какого-то кода над каждым из его элементов. Под капотом это неявно создавало, а затем потребляло итератор, но до сих пор мы не касались того, как именно это работает. В примере из листинга 13-11 мы отделили создание итератора от его использования в цикле for. Как вы можете уже догадаться во время итерации по вектору мы на самом деле вызываем для этого вектора intoiteratorintoiter, получая на его выходе итератор.
Вызывая next в каждой итерации мы продолжаем двигаться по циклу пока не получим none. В сущности просто синтаксический сахар для следующего выражения let mut iter intoiteratorintoiter(v) loop match iter. Тело цикла iterators are a powerful tool that allow for efficient iteration over data structures, and they are implemented in many programming languages - including rust. However, rusts unique ownership system gives rise to interesting differences in how iterators are implemented and used. In this article, we will explore these differences and delve into rusts features by creating and implementing the most commonly used iterator traits - iterator and intoiterator. Imagine you have a structure like this there are actually different ways in rust to create iterators from types. While the intoiterator and its intoiter() method are mostly called implicitly when we use for loops, iter() and itermut() methods are often provided by collection types to create iterators explicitly.
Theres no trait that provides iter() and itermut(), so its more of a convention that collection types may implement these methods. The example from above can then be written as follows let names vec!pascal, elvira, dominic, christoph in the code above, you may consider for as a simple loop, but actually it is iterating over a iterator. By default for will apply the intoiter to the collection, and change it into a iterator. As a result, the following code is equivalent to previous one fn main() let v vec!1, 2, 3 for x in v. Let us take a journey through the world of iterators and figure out the differences between iter() and intoiter() in rust. This creates an itera, t type and it is this itera, t type that implements the iterator trait and allows us to call functions like.
Rust provides several built-in infinite iterators, such as stditerrepeat and stditercycle. For instance, repeat produces an infinite sequence of a single, repeated value let ones stditerrepeat(1) on the other hand, cycle takes a finite iterator and produces an infinite sequence by endlessly repeating its values let pattern vec!1, 2, 3. While infinite iterators can produce endless values, we often want to work with a finite subset of those values. It is primarily used for looping and we can only loop over iterators in rust. Let numbers 2, 1, 17, 99, 34, 56 now, lets change the array to an iterable array by calling the iter() method. .