Struct nonminmax::NonMaxIsize

#[repr(transparent)]
pub struct NonMaxIsize { /* fields omitted */ }

An integer of type isize which is known to not equal isize::MAX.

This type allows for niche filling optimization (similar to the existing std::num::NonZero* types) meaning items such as Option<NonMaxIsize> and Result<NonMaxIsize, ()> take up the same amount of space as isize.

// Create using `new`, extract value using `get`
let x = NonMaxIsize::new(123).unwrap();
assert_eq!(x.get(), 123);

// The value cannot be `isize::MAX`
let y = NonMaxIsize::new(isize::MAX);
assert_eq!(y, None);

// Niche filling optimization works!
use std::mem::size_of;
assert_eq!(size_of::<isize>(), size_of::<NonMaxIsize>());
assert_eq!(size_of::<isize>(), size_of::<Option<NonMaxIsize>>());

Methods

impl NonMaxIsize

pub fn new(value: isize) -> Option<Self>

Creates an instance of NonMaxIsize by checking if the value is not isize::MAX.

pub unsafe fn new_unchecked(value: isize) -> Self

Creates an instance of NonMaxIsize without checking if the value is not isize::MAX.

Safety

The value cannot be equal to isize::MAX.

pub fn get(self) -> isize

Returns the integer value.

Trait Implementations

impl Clone for NonMaxIsize

fn clone(&self) -> NonMaxIsize

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for NonMaxIsize

impl Debug for NonMaxIsize

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Display for NonMaxIsize

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Eq for NonMaxIsize

impl From<NonMaxIsize> for isize

fn from(nontype: NonMaxIsize) -> Self

Performs the conversion.

impl Hash for NonMaxIsize

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given [Hasher].

impl Ord for NonMaxIsize

fn cmp(&self, other: &NonMaxIsize) -> Ordering

This method returns an [Ordering] between self and other.

#[must_use] fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

#[must_use] fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

#[must_use] fn clamp(self, min: Self, max: Self) -> Self

🔬 This is a nightly-only experimental API. (clamp)

Restrict a value to a certain interval.

impl PartialEq<NonMaxIsize> for NonMaxIsize

fn eq(&self, other: &NonMaxIsize) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &NonMaxIsize) -> bool

This method tests for !=.

impl PartialOrd<NonMaxIsize> for NonMaxIsize

fn partial_cmp(&self, other: &NonMaxIsize) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &NonMaxIsize) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &NonMaxIsize) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &NonMaxIsize) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &NonMaxIsize) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralEq for NonMaxIsize

impl StructuralPartialEq for NonMaxIsize