NonZeroI16 in core::num - Rust
Description: An integer that is known not to equal zero.

core::num

# Type Alias NonZeroI16

1.34.0 · source

    pub type NonZeroI16 = NonZero<i16>;

Expand description

An integer that is known not to equal zero.

This enables some memory layout optimization. For example, `Option<NonZeroI16>` is the same size as `i16`:

    use std::mem::size_of;
    assert_eq!(size_of::<Option<core::num::NonZeroI16>>(), size_of::<i16>());

## §Layout

`NonZeroI16` is guaranteed to have the same layout and bit validity as `i16` with the exception that `0` is not a valid instance. `Option<NonZeroI16>` is guaranteed to be compatible with `i16`, including in FFI.

Thanks to the null pointer optimization, `NonZeroI16` and `Option<NonZeroI16>` are guaranteed to have the same size and alignment:

    use std::num::NonZeroI16;

    assert_eq!(size_of::<NonZeroI16>(), size_of::<Option<NonZeroI16>>());
    assert_eq!(align_of::<NonZeroI16>(), align_of::<Option<NonZeroI16>>());

## Aliased Type§

    struct NonZeroI16(/* private fields */);