Type Alias NonZeroU128 

pub type NonZeroU128 = NonZero<u128>;

A u128 that is known not to equal zero.

This enables some memory layout optimization. For example, Option<NonZeroU128> is the same size as u128:

assert_eq!(size_of::<Option<core::num::NonZeroU128>>(), size_of::<u128>());

Layout

NonZeroU128 is guaranteed to have the same layout and bit validity as u128 with the exception that 0 is not a valid instance. Option<NonZeroU128> is guaranteed to be compatible with u128, including in FFI.

Thanks to the null pointer optimization, NonZeroU128 and Option<NonZeroU128> are guaranteed to have the same size and alignment:

use std::num::NonZeroU128;

assert_eq!(size_of::<NonZeroU128>(), size_of::<Option<NonZeroU128>>());
assert_eq!(align_of::<NonZeroU128>(), align_of::<Option<NonZeroU128>>());

Aliased Type

#[repr(transparent)]
pub struct NonZeroU128(/* private fields */);

Trait Implementations

impl<'de> Deserialize<'de> for NonZeroU128

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for NonZeroU128

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.