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programming:rust [2020/12/13 18:10] – [Traits] mh | programming:rust [2020/12/13 18:35] – [Traits] mh | ||
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A **trait** tells the Rust compiler about functionality a particular type has and can share with other types. | A **trait** tells the Rust compiler about functionality a particular type has and can share with other types. | ||
</ | </ | ||
+ | |||
+ | === Defining === | ||
+ | |||
+ | [[https:// | ||
+ | |||
+ | <code rust> | ||
+ | pub trait Summary { | ||
+ | fn summarize(& | ||
+ | } | ||
+ | </ | ||
+ | |||
+ | Each type implementing the '' | ||
+ | |||
+ | To implement a trait on a type : | ||
+ | |||
+ | <code rust> | ||
+ | impl Summary for SomeStruct { | ||
+ | fn summarize(& | ||
+ | //some code | ||
+ | } | ||
+ | } | ||
+ | </ | ||
+ | |||
+ | If the trait had a default behavior, this implementation will override it. | ||
+ | |||
+ | Default implementations can also call other methods in the same trait, even if those other methods don't have a default implementation. | ||
+ | |||
+ | === Traits as Parameters === | ||
+ | |||
+ | Traits can be used to define functions that accept many different types who all implement a certain trait. The function is defined using that trait as a parameter, instead of concrete types. [[https:// | ||
+ | |||
+ | === Blanket implementations === | ||
+ | |||
+ | They are extensively used in the Rust Standard librarby and allow implementing a trait for any type that implements another trait. [[https:// | ||
===== Misc ===== | ===== Misc ===== | ||