Access the methods of primitive Rust types

Question

How can I access the methods of primitive types in Rust?

Concretely, I want to pass either one of the two slice methods split_first_mut and split_last_mut to a function operating on slices. I know you can wrap them in closures as a workaround, but I’d like to know if direct access is possible.

Answer 1

You can access the methods on primitives just like regular types:

u8::to_le();
str::from_utf8();
<[_]>::split_first_mut();

You can create a function that accepts a slice ops function:

fn do_thing<T>(f: impl Fn(&mut [u8])) -> Option<(&mut T, &mut [T])>) {
    // ...
}

And pass in both split_first_mut and split_last_mut:

fn main() {
    do_thing(<[_]>::split_first_mut);
    do_thing(<[_]>::split_last_mut);
}