3 releases (breaking)

✓ Uses Rust 2018 edition

new 0.2.0 Sep 10, 2019
0.1.0 Sep 9, 2019
0.0.0 Sep 7, 2019

#88 in No standard library



Numeric casts

This crate provides checked, overflowing and static casts.

What’s new

Version 0.2.0 news (2019-09-10)

  • The old *As traits were renamed to *Cast.
  • New more convenient *As traits were added.

Quick examples

use az::{Az, OverflowingAs, WrappingAs};
use core::num::Wrapping;

// Panics on overflow with `debug_assertions`, otherwise wraps
assert_eq!(12i32.az::<u32>(), 12u32);

// Always wraps
let wrapped = 1u32.wrapping_neg();
assert_eq!((-1).wrapping_as::<u32>(), wrapped);
assert_eq!((-1).overflowing_as::<u32>(), (wrapped, true));

// Wrapping can also be obtained using `Wrapping`
assert_eq!((-1).az::<Wrapping<u32>>().0, wrapped);

Conversions from floating-point to integers are also supported. Numbers are rounded towards zero, but the Round wrapper can be used to convert floating-point numbers to integers with rounding to the nearest, with ties rounded to even.

use az::{Az, CheckedAs, Round, SaturatingAs};
use core::f32;

assert_eq!(15.7.az::<i32>(), 15);
assert_eq!(Round(15.5).az::<i32>(), 16);
assert_eq!(1.5e20.saturating_as::<i32>(), i32::max_value());
assert_eq!(f32::NAN.checked_as::<i32>(), None);

Using the az crate

The az crate is available on crates.io. To use it in your crate, add it as a dependency inside Cargo.toml:

az = "0.2.0"


This crate is free software: you can redistribute it and/or modify it under the terms of either

at your option.


Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache License, Version 2.0, shall be dual licensed as above, without any additional terms or conditions.

No runtime deps