Macro extendr_api::c

macro_rules! c {
    () => { ... };
    ($($rest: tt)*) => { ... };
}

Concatenation operator.

Example:

use extendr_api::*;
start_r();
let fred = c!(1, 2, 3);
assert_eq!(fred, Robj::from(&[1, 2, 3][..]));