grabbag_macros::count_exprs! [−] [src]

macro_rules! count_exprs {
    () => { ... };
    ($e:expr) => { ... };
    ($e:expr, $($es:expr),+) => { ... };
}

Counts the number of comma-delimited expressions passed to it. The result is a compile-time evaluable expression, suitable for use as a static array size, or the value of a const.

Example:

const COUNT: usize = count_exprs!(a, 5+1, "hi there!".into_string());
assert_eq!(COUNT, 3);