arith

Plain +, -, * and ** on int panic when the result does not fit. Import one of these traits to say what should happen instead: Checked gives an Option, Wrapping wraps modulo 2^64, Saturating clamps, and Overflowing returns the wrapped value with a flag.

use arith::{Checked, Wrapping};
use tests::{assert};

fn main() {
    assert!(9223372036854775807.checked_add(1).is_none());
    assert!(31.wrapping_pow(20) != 0);
}

Part of coil-stdlib. spool projects get it automatically; with plain coil, pass --root ~/.coil/stdlib/src.

Import what you use (use path::* is not allowed):

use arith::{Checked, Wrapping};

Traits#

Constants#