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This article mainly introduces "what you need to pay attention to when using rust clone". In daily operation, I believe that many people have doubts about what they need to pay attention to when using rust clone. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful for you to answer the doubts of "what do you need to pay attention to when using rust clone?" Next, please follow the editor to study!

First look at code A:

# [derive (Debug, Clone)] struct Test (i32); fn main () {let mut x = Test (1); let a = & x; let b = a.clone (); let c: i32 = b;}

The error reported in this code is:

| | 8 | let c: i32 = b; | ^ expected i32, found struct `Test` | = note: expected type `i32` found type `Test` |

Look at code B again:

# [derive (Debug)] struct Test (i32); fn main () {let mut x = Test (1); let a = & x; let b = a.clone (); let c: i32 = b;}

The error report is:

| | 8 | let c: i32 = b; | ^ expected i32, found & Test | = note: expected type `i32` found type `& test` |

The only difference between the two pieces of code is that the structure Test,An implementation Clone,B does not implement Clone.

The conclusion is: if a reference, if the object it refers to cannot clone, clone the reference, and if it can clone, directly clone the object and return it.

At this point, the study of "what you need to pay attention to when using rust clone" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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