Type Alias core::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
:
§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:
Aliased Type§
struct NonZeroU128(/* private fields */);