nonmax

nonmax provides types similar to the std NonZero* types, but instead requires that their values are not the maximum for their type. This ensures that Option<NonMax*> is no larger than NonMax*.

nonmax supports every type that has a corresponding non-zero variant in the standard library:

NonMaxI8
NonMaxI16
NonMaxI32
NonMaxI64
NonMaxI128
NonMaxIsize
NonMaxU8
NonMaxU16
NonMaxU32
NonMaxU64
NonMaxU128
NonMaxUsize

Example

use nonmax::{NonMaxI16, NonMaxU8};

let value = NonMaxU8::new(16).expect("16 should definitely fit in a u8");
assert_eq!(value.get(), 16);
assert_eq!(std::mem::size_of_val(&value), 1);

let signed = NonMaxI16::new(i16::min_value()).expect("minimum values are fine");
assert_eq!(signed.get(), i16::min_value());
assert_eq!(std::mem::size_of_val(&signed), 2);

let oops = NonMaxU8::new(255);
assert_eq!(oops, None);

Features

std (default): implements [std::error::Error] for [ParseIntError] and [TryFromIntError]. Disable this feature for #![no_std] support.
serde: implements the Serialize and Deserialize traits from serde.

Minimum Supported Rust Version (MSRV)

nonmax supports Rust 1.47.0 and newer. Until this library reaches 1.0, changes to the MSRV will require major version bumps. After 1.0, MSRV changes will only require minor version bumps, but will need significant justification.

License

Licensed under either of

Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution