Generische Methoden

Traits can also be generic, just like types and functions. A trait's parameters get concrete types when it is used.

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Speaker Notes

  • The From trait will be covered later in the course, but its definition in the std docs is simple.

  • Implementations of the trait do not need to cover all possible type parameters. Here, Foo::from("hello") would not compile because there is no From<&str> implementation for Foo.

  • Generic traits take types as "input", while associated types are a kind of "output" type. A trait can have multiple implementations for different input types.

  • In fact, Rust requires that at most one implementation of a trait match for any type T. Unlike some other languages, Rust has no heuristic for choosing the "most specific" match. There is work on adding this support, called specialization.