pub type NonZeroU32 = NonZero<u32>;Expand description
A u32 that is known not to equal zero.
This enables some memory layout optimization.
For example, Option<NonZeroU32> is the same size as u32:
§Layout
NonZeroU32 is guaranteed to have the same layout and bit validity as u32
with the exception that 0 is not a valid instance.
Option<NonZeroU32> is guaranteed to be compatible with u32,
including in FFI.
Thanks to the null pointer optimization,
NonZeroU32 and Option<NonZeroU32>
are guaranteed to have the same size and alignment:
Aliased Type§
struct NonZeroU32(/* private fields */);