Type Alias tracing_core::stdlib::num::NonZeroU128

1.28.0 · source ·
pub type NonZeroU128 = NonZero<u128>;
Expand description

An integer that is known not to equal zero.

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

use std::mem::size_of;
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§

struct NonZeroU128(/* private fields */);

Trait Implementations§

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impl Value for NonZeroU128

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fn record(&self, key: &Field, visitor: &mut dyn Visit)

Visits this value with the given Visitor.
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impl Sealed for NonZeroU128