Type Alias std::num::NonZeroU64
1.28.0 · source · pub type NonZeroU64 = NonZero<u64>;Expand description
An integer that is known not to equal zero.
This enables some memory layout optimization.
For example, Option<NonZeroU64> is the same size as u64:
§Layout
NonZeroU64 is guaranteed to have the same layout and bit validity as u64
with the exception that 0 is not a valid instance.
Option<NonZeroU64> is guaranteed to be compatible with u64,
including in FFI.
Thanks to the null pointer optimization,
NonZeroU64 and Option<NonZeroU64>
are guaranteed to have the same size and alignment:
Aliased Type§
struct NonZeroU64(/* private fields */);