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Обсуждение на тему: Copy rust

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Copy rust

The simplest is to use derive struct mystruct you can also implement copy and clone manually impl copy for mystruct impl clone for mystruct fn clone(&self) - mystruct self. In rust, some simple types are implicitly copyable and when you assign them or pass them as arguments, the receiver will get a copy, leaving the original value in place. For other types, copies must be made explicitly, by implementing the clone trait and calling the clone() method. Copy is semantically equivalent to cs memmove, but with the argument order swapped.

Copying takes place as if the bytes were copied from src to a temporary array and then copied from the array to dst. Copy and clone are both used for duplicating stuff in rust, but the way its actually done, and which are used in what situations are very different. As usual, keeping the chapter on rusts ownership model handy is advisable, as it provides a foundation for just about anything else youll learn about the language. This function will continuously read data from reader and then write it into writer in a streaming fashion until reader returns eof.

On success, the total number of bytes that were copied from reader to writer is returned. The simplest is to use derive struct mystruct you can also implement copy and clone manually impl copy for mystruct impl clone for mystruct fn clone(&self) - mystruct self. The simplest is to use derive struct mystruct you can also implement copy and clone manually impl copy for mystruct impl clone for mystruct fn clone(&self) - mystruct self. Derive(clone, copy) is the right way, but for the record, its not magical its easy to implement those traits manually, especially in easy cases such as yours impl copy for direction impl clone for direction fn clone(&self) - self self at the heart of rusts memory model lies an important distinction between two ways of duplicating data copy and clone.

While these terms might seem similar at first glance, they represent fundamentally different approaches to handling data duplication in your programs. Clone is a standard trait designed to explicitly duplicate an object t. Technically, it does not mean copying a huge amount of memory as some people think e. .