nz

The nz crate provides a collection of user-friendly macros that simplify the creation of new instances of non-zero numeric types found in the core::num. With these macros, you can effortlessly generate instances using numeric literals, constant values and constant expressions, all at compile time.

Features

• No unsafe code
• No dependencies
• no_std compatible
• Supports all numeric non-zero types from the core::num module
• Compile time evaluation
• Zero detection at compile time

NonZero macros

Basic usage

use core::num::NonZeroU8;

const NZ_U8_MIN: NonZeroU8 = nz::u8!(1); // with numeric literal
const NZ_U8_MAX: NonZeroU8 = nz::u8!(u8::MAX); // with constant value
let sum = nz::u8!(NZ_U8_MAX.get() & NZ_U8_MIN.get() + 7); // with constant expression

Remarks

Non-zero macros cannot be used with constant function arguments as they are not considered as constant values.

Example

use core::num::NonZeroU64;

const fn wrapping_add_nz(a: u64, b: NonZeroU64) -> NonZeroU64 {
    // `a` and `b` is not constant
    nz::u64!(a.wrapping_add(b.get())) // <- cause of the compile error
}
let nz = wrapping_add_nz(2, nz::u64!(1));