《Rust in Action》enum is like a basket, you can put anything in it

ltaodream

《Rust in Action》enum is like a basket, you can put anything in it [Copy link]

<div class='showpostmsg'># 《Rust in Action》 Mastering Rust's Composite Data Types - Enumerations Review the Rust basic data types in Chapter 3 and share them with everyone. They are all here. There are also some extensions. You can learn them directly~ It's better to follow the code and type it! ! Let's get started with Rust! # The instantiation of an enumeration structure requires all fields to work together, while the instantiation of an enumeration only requires and can only require one of the variants to work. ```cpp enum Shape { Rectangle, Triangle, Circle, } ``` **Unlike Java and C++, enumerations in Rust have more powerful expressive power** Variants in enum can mount various forms of types. -> **enum is like a basket, everything can be put into it. ** All other types, such as strings, tuples, structures, etc. ```cpp enum Shape { Rectangle { width: u64, height: u64}, Triangle((u32, u32), (u32, u32), (u32, u32)), Circle { origin: (u32, u32), radius: u32 }, } ``` You can even bring in the structure directly```cpp struct Rectangle { width: u64, height: u32 } enum Shape { Rectangle(Rectangle), } ``` # The empty enumeration, like the unit structure, represents a type. But it cannot be instantiated. ```cpp enum Aa {} ``` # Traditional enumeration Rust also supports enumerations in C and C++```cpp enum Number { a = 0, b, c, } enum Number2 { a = 0, b = 8, c = 111, } ``` </div><script> var loginstr = '<div class="locked">To view all the contents of the post, please <a href="/bbs/member.php?mod=logging&action=login" style="color:#e60000" class="loginf">log in</a> or <a href="/bbs/member.php?mod=register_eeworld.php&action=wechat" style="color:#e60000" target="_blank">register</a></div>'; if(parseInt(discuz_uid)==0){ } </script><script type="text/javascript">(function(d,c){var a=d.createElement("script"),m=d.getElementsByTagName("script")[0],eewurl="//counter.eeworld.com.cn/pv/count/";a.src=eewurl+c;m.parentNode.insertBefore(a,m)})(document,523)</script>

hellokitty_bean

I just caught up with my brother and was about to look at the enumeration.

Suddenly I saw a sentence: Enumeration is good, but don’t abuse it! ??? Haha, is it true?

lugl4313820

Very good sharing!

freebsder

What are the advantages?

ltaodream

freebsder posted on 2024-5-7 13:48 What are the advantages?

Various forms of expression

吾妻思萌

I have a question: Can an enumeration add a value at the end?