Function msg_send_1 

pub unsafe fn msg_send_1<R, A>(obj: *const c_void, sel: Sel, a: A) -> R

Send a message with 1 argument.

Safety

• obj must be a valid Objective-C object pointer or class pointer
• sel must be a valid selector for a method that takes 1 argument
• The argument type A must match the expected parameter type
• The return type R must match the actual return type of the method