Type Alias serde::lib::num::NonZeroIsize

1.34.0 · source ·
pub type NonZeroIsize = NonZero<isize>;
Expand description

An integer that is known not to equal zero.

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

use std::mem::size_of;
assert_eq!(size_of::<Option<core::num::NonZeroIsize>>(), size_of::<isize>());


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

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

use std::num::NonZeroIsize;

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

Aliased Type§

struct NonZeroIsize(isize);


§0: isize
🔬This is a nightly-only experimental API. (generic_nonzero)

Trait Implementations§


impl<'de> Deserialize<'de> for NonZeroIsize


fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more

impl Serialize for NonZeroIsize


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

Serialize this value into the given Serde serializer. Read more