Struct NonValueU32 

pub struct NonValueU32<const V: u32>(/* private fields */);

⅀ ⚗️ An unsigned integer that is known not to equal some specific value.

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^{📍 num/grain/niche}

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It has the same memory layout optimization as NonZero<u32>, so that Option<NonValueU32> is the same size as NonValueU32.

Examples

assert![NonValueI8::<13>::new(13).is_none()];
assert![NonValueI8::<13>::new(12).unwrap().get() == 12];

See also NonMaxU32.

Implementations

impl<const V: u32> NonValueU32<V>

pub const MAX: Self

Returns the maximum possible value.

pub const MIN: Self

Returns the minimum possible value.

pub const VALID_VALUES: u32 = u32::MAX

Returns the number of valid values.

pub const INVALID_VALUES: u32 = 1

Returns the number of invalid values.

pub const fn new(value: u32) -> Option<Self>

Returns a NonValueU32 with the given value, if it is not equal to V.

pub const fn new_lossy(value: u32) -> Self

Creates a non-value integer, automatically converting the prohibited value V to the closest valid number (V-1 for most cases, V+1 for MIN).

Guarantees

• For unsigned MAX: V-1 → stored as !(V-1)
• For signed MIN: V+1 → stored as (V+1) ^ MIN
• All others: V-1 → stored as (V-1) ^ V

Features

• Can use the unsafe_niche feature internally.

Examples

let x = assert_eq![NonValueU8::<255>::new_lossy(255).get(), 254];
let y = assert_eq![NonValueI8::<-128>::new_lossy(-128).get(), -127];

pub const unsafe fn new_unchecked(value: u32) -> Self

Available on crate feature unsafe_niche only.

Returns a NonValueU32 if the given value if it is not equal to V.

Panics

Panics in debug if the given value is equal to V.

Safety

The given value must never be equal to V.

pub const fn get(&self) -> u32

Returns the value as a primitive type.

pub const fn is_max(&self) -> bool

Returns true if it is equal to the maximum value (MAX).

pub const fn is_min(&self) -> bool

Returns true if it is equal to the minimum value (MIN).

pub const fn checked_add(&self, other: u32) -> Result<Self, NicheValueError>

Checked integer addition. Computes self + rhs.

Errors

Returns Overflow if the operations overflows, or InvalidValue if the result equals the forbidden value V.

pub const fn checked_sub(&self, other: u32) -> Result<Self, NicheValueError>

Checked integer substration. Computes self - rhs.

Errors

Returns Overflow if the operations overflows, or InvalidValue if the result equals the forbidden value V.

pub const fn strict_add(&self, other: u32) -> Self

Strict integer addition. Computes self + rhs.

Panics

Panics on overflow or if the result equals the forbidden value V.

pub const fn strict_sub(&self, other: u32) -> Self

Strict integer substration. Computes self - rhs.

Panics

Panics on overflow or if the result equals the forbidden value V.

pub const fn saturating_add(&self, other: u32) -> Self

Saturating integer addition. Computes self + rhs.

Saturates at the numeric bounds instead of overflowing. If the result would equal V it will return V - 1.

pub const fn saturating_sub(&self, other: u32) -> Self

Saturating integer substration. Computes self - rhs.

Saturates at the numeric bounds instead of overflowing. If the result would equal V it will return V + 1.

pub const fn wrapping_add(&self, other: u32) -> Self

Wraping integer addition. Computes self + rhs.

Wraps at the numeric bounds instead of overflowing. If the result would equal V it will return V + 1.

pub const fn wrapping_sub(&self, other: u32) -> Self

Wraping integer subtraction. Computes self - rhs.

Wraps at the numeric bounds instead of overflowing. If the result would equal V it will return V - 1.

Trait Implementations

impl<const V: u32> Binary for NonValueU32<V>

fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult<()>

Formats the value using the given formatter.

impl<const V: u32> BitSized<{<$IP>::BYTE_SIZE * 8}> for NonValueU32<V>

const BIT_SIZE: usize = _

The bit size of this type (only the relevant data part, without padding).

const MIN_BYTE_SIZE: usize = _

The rounded up byte size for this type.

fn bit_size(&self) -> usize

Returns the bit size of this type (only the relevant data part, without padding).

fn min_byte_size(&self) -> usize

Returns the rounded up byte size for this type.

impl<const V: u32> Clone for NonValueU32<V>

fn clone(&self) -> NonValueU32<V>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<const V: u32> ConstInit for NonValueU32<V>

const INIT: Self

Initializes to 0 when allowed, or to Self::MIN when V == 0.

impl<const V: u32> Copy for NonValueU32<V>

impl<const V: u32> Debug for NonValueU32<V>

fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult<()>

Formats the value using the given formatter.

impl<const V: u32> Display for NonValueU32<V>

fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult<()>

Formats the value using the given formatter.

impl<const V: u32> Eq for NonValueU32<V>

impl<const V: u32> From<NonValueU32<V>> for u32

fn from(value: NonValueU32<V>) -> u32

Converts to this type from the input type.

impl<const V: u32> FromStr for NonValueU32<V>

type Err = ParseIntError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl<const V: u32> Hash for NonValueU32<V>

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, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<const V: u32> LowerHex for NonValueU32<V>

fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult<()>

Formats the value using the given formatter.

impl<const V: u32> Octal for NonValueU32<V>

fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult<()>

Formats the value using the given formatter.

impl<const V: u32> Ord for NonValueU32<V>

fn cmp(&self, other: &NonValueU32<V>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl<const V: u32> PartialEq for NonValueU32<V>

fn eq(&self, other: &NonValueU32<V>) -> bool

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<const V: u32> PartialOrd for NonValueU32<V>

fn partial_cmp(&self, other: &NonValueU32<V>) -> Option<Ordering>

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

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

Tests less than (for self and other) and is used by the < operator.

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

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

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

Tests greater than (for self and other) and is used by the > operator.

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

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

impl<const V: u32> StructuralPartialEq for NonValueU32<V>

impl<const V: u32> TryFrom<u32> for NonValueU32<V>

fn try_from(value: u32) -> Result<Self, Self::Error>

Features

Makes use of the unsafe_niche feature if enabled.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl<const V: u32> UpperHex for NonValueU32<V>

fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult<()>

Formats the value using the given formatter.