Is there a shorthand for AsRef<T> in Rust?

Question

Is there suggar for AsRef?

I'm frequently declaring string-like parameters with as ref to make it easier to interop with various incantations of strings (String, &str, &String, etc.) as so:

fn Fun<S: AsRef<str>>(my: S) { ... my.as_ref() ...} 

However now reading back those implementations after a while, it's visually taking more real estate in the code than I feel it should, is there a way to shrink usages? For instance not having to declare a type param explicitly, not having to call as_ref() explicitly, etc.

Looking at this cheatsheet , the book , and the doc does not suggest that there is.

Best.

Answer 1

You could declare a trait alias (requires nightly) and/or use impl trait

trait AsStr = AsRef<str>;


fn my_func(arg: impl AsStr) {

  arg.as_ref() ...

}