Macro class 

pub macro class($classname:expr) {
    ...
}

🔬This is a nightly-only experimental API. (darwin_objc #145496)

Available on Apple only.

Gets a reference to an Objective-C class.

This macro will yield an expression of type Class for the given class name string literal.

Example

#![feature(darwin_objc)]
use core::os::darwin::objc;

let string_class = objc::class!("NSString");