#unsigned-integer #integer-value #integer #smallest #compile-time #typenum #compact

no-std smallest-uint

Gets the smallest unsigned integer type that can represent a given value

6 releases

0.1.5 Dec 26, 2022
0.1.4 Dec 20, 2022
0.1.3 Apr 26, 2022
0.1.2 Nov 7, 2021
0.1.1 Feb 6, 2021

#256 in Memory management


127 lines


Given an unsigned type-level integer, provides access to the smallest primitive unsigned integer type (u8, u16, etc.) that can represent the integer’s value (or all values less than that value).

This is mainly useful for minimizing memory usage when building data structures.

This crate depends only on core, so it can be used in no_std environments.


use smallest_uint::{SmallestUIntFor, SmallestUIntUpTo};
use std::any::TypeId;
use typenum::U65536;

assert_eq!(TypeId::of::<SmallestUIntUpTo<U65536>>(), TypeId::of::<u16>());
assert_eq!(TypeId::of::<SmallestUIntFor<U65536>>(), TypeId::of::<u32>());

Crate features

If the feature u128 is enabled, this crate will use the u128 type. This feature is enabled by default.