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Обсуждение на тему: Rust iter

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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 you can write your own iterators for your types, but especially early on most of the benefit youll get is from knowing how to use the iterators already in the rust standard library. My intention in writing this article is to present a bunch of different functionality that iterators give you out of the box, where theyre useful, and examples of how to use them. 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 term an iterator is any value that implements the stditeriterator trait. In rust, iterators are lazy, meaning they have no effect until you call methods that consume the iterator to use it up. For example, the code in listing 13-10 creates an iterator over the items in the vector v1 by calling the iter method defined on vect. If we want to create an iterator that takes ownership of v1 and returns owned values, we can call intoiter instead of iter. 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. 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 rust combines ease of programming with access to core system-level configurations. Its built with memory safety, concurrency, and security from the ground up, making it the perfect choice to build scalable high-performance applications. Using the iter() function, we tell rust that the given array can be used with a loop. Similar to how a function doesnt do anything until it is called, the iter() function is used to invoke iteration in an array. .

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