Struct std::num::NonZeroI128

pub struct NonZeroI128(/* private fields */);

An integer that is known not to equal zero.

This enables some memory layout optimization. For example, Option<NonZeroI128> is the same size as i128:

use std::mem::size_of;
assert_eq!(size_of::<Option<core::num::NonZeroI128>>(), size_of::<i128>());

Layout

NonZeroI128 is guaranteed to have the same layout and bit validity as i128 with the exception that 0 is not a valid instance. Option<NonZeroI128> is guaranteed to be compatible with i128, including in FFI.

Thanks to the null pointer optimization, NonZeroI128 and Option<NonZeroI128> are guaranteed to have the same size and alignment:

use std::num::NonZeroI128;

assert_eq!(size_of::<NonZeroI128>(), size_of::<Option<NonZeroI128>>());
assert_eq!(align_of::<NonZeroI128>(), align_of::<Option<NonZeroI128>>());

Implementations

impl NonZeroI128

pub const unsafe fn new_unchecked(n: i128) -> NonZeroI128

Creates a non-zero without checking whether the value is non-zero. This results in undefined behaviour if the value is zero.

Safety

The value must not be zero.

pub const fn new(n: i128) -> Option<NonZeroI128>

Creates a non-zero if the given value is not zero.

pub const fn get(self) -> i128

Returns the value as a primitive type.

impl NonZeroI128

pub const fn leading_zeros(self) -> u32

Returns the number of leading zeros in the binary representation of self.

On many architectures, this function can perform better than leading_zeros() on the underlying integer type, as special handling of zero can be avoided.

Examples

Basic usage:

let n = std::num::NonZeroI128::new(-1i128).unwrap();

assert_eq!(n.leading_zeros(), 0);

pub const fn trailing_zeros(self) -> u32

Returns the number of trailing zeros in the binary representation of self.

On many architectures, this function can perform better than trailing_zeros() on the underlying integer type, as special handling of zero can be avoided.

Examples

Basic usage:

let n = std::num::NonZeroI128::new(0b0101000).unwrap();

assert_eq!(n.trailing_zeros(), 3);

impl NonZeroI128

pub const fn abs(self) -> NonZeroI128

Computes the absolute value of self. See i128::abs for documentation on overflow behaviour.

Example

let pos = NonZeroI128::new(1)?;
let neg = NonZeroI128::new(-1)?;

assert_eq!(pos, pos.abs());
assert_eq!(pos, neg.abs());

pub const fn checked_abs(self) -> Option<NonZeroI128>

Checked absolute value. Checks for overflow and returns None if self == NonZeroI128::MIN. The result cannot be zero.

Example

let pos = NonZeroI128::new(1)?;
let neg = NonZeroI128::new(-1)?;
let min = NonZeroI128::new(i128::MIN)?;

assert_eq!(Some(pos), neg.checked_abs());
assert_eq!(None, min.checked_abs());

pub const fn overflowing_abs(self) -> (NonZeroI128, bool)

Computes the absolute value of self, with overflow information, see i128::overflowing_abs.

Example

let pos = NonZeroI128::new(1)?;
let neg = NonZeroI128::new(-1)?;
let min = NonZeroI128::new(i128::MIN)?;

assert_eq!((pos, false), pos.overflowing_abs());
assert_eq!((pos, false), neg.overflowing_abs());
assert_eq!((min, true), min.overflowing_abs());

pub const fn saturating_abs(self) -> NonZeroI128

Saturating absolute value, see i128::saturating_abs.

Example

let pos = NonZeroI128::new(1)?;
let neg = NonZeroI128::new(-1)?;
let min = NonZeroI128::new(i128::MIN)?;
let min_plus = NonZeroI128::new(i128::MIN + 1)?;
let max = NonZeroI128::new(i128::MAX)?;

assert_eq!(pos, pos.saturating_abs());
assert_eq!(pos, neg.saturating_abs());
assert_eq!(max, min.saturating_abs());
assert_eq!(max, min_plus.saturating_abs());

pub const fn wrapping_abs(self) -> NonZeroI128

Wrapping absolute value, see i128::wrapping_abs.

Example

let pos = NonZeroI128::new(1)?;
let neg = NonZeroI128::new(-1)?;
let min = NonZeroI128::new(i128::MIN)?;

assert_eq!(pos, pos.wrapping_abs());
assert_eq!(pos, neg.wrapping_abs());
assert_eq!(min, min.wrapping_abs());
assert_eq!(max, (-max).wrapping_abs());

pub const fn unsigned_abs(self) -> NonZeroU128

Computes the absolute value of self without any wrapping or panicking.

Example

let u_pos = NonZeroU128::new(1)?;
let i_pos = NonZeroI128::new(1)?;
let i_neg = NonZeroI128::new(-1)?;
let i_min = NonZeroI128::new(i128::MIN)?;
let u_max = NonZeroU128::new(u128::MAX / 2 + 1)?;

assert_eq!(u_pos, i_pos.unsigned_abs());
assert_eq!(u_pos, i_neg.unsigned_abs());
assert_eq!(u_max, i_min.unsigned_abs());

pub const fn is_positive(self) -> bool

Returns true if self is positive and false if the number is negative.

Example

let pos_five = NonZeroI128::new(5)?;
let neg_five = NonZeroI128::new(-5)?;

assert!(pos_five.is_positive());
assert!(!neg_five.is_positive());

pub const fn is_negative(self) -> bool

Returns true if self is negative and false if the number is positive.

Example

let pos_five = NonZeroI128::new(5)?;
let neg_five = NonZeroI128::new(-5)?;

assert!(neg_five.is_negative());
assert!(!pos_five.is_negative());

pub const fn checked_neg(self) -> Option<NonZeroI128>

Checked negation. Computes -self, returning None if self == NonZeroI128::MIN.

Example

let pos_five = NonZeroI128::new(5)?;
let neg_five = NonZeroI128::new(-5)?;
let min = NonZeroI128::new(i128::MIN)?;

assert_eq!(pos_five.checked_neg(), Some(neg_five));
assert_eq!(min.checked_neg(), None);

pub const fn overflowing_neg(self) -> (NonZeroI128, bool)

Negates self, overflowing if this is equal to the minimum value.

See i128::overflowing_neg for documentation on overflow behaviour.

Example

let pos_five = NonZeroI128::new(5)?;
let neg_five = NonZeroI128::new(-5)?;
let min = NonZeroI128::new(i128::MIN)?;

assert_eq!(pos_five.overflowing_neg(), (neg_five, false));
assert_eq!(min.overflowing_neg(), (min, true));

pub const fn saturating_neg(self) -> NonZeroI128

Saturating negation. Computes -self, returning NonZeroI128::MAX if self == NonZeroI128::MIN instead of overflowing.

Example

let pos_five = NonZeroI128::new(5)?;
let neg_five = NonZeroI128::new(-5)?;
let min = NonZeroI128::new(i128::MIN)?;
let min_plus_one = NonZeroI128::new(i128::MIN + 1)?;
let max = NonZeroI128::new(i128::MAX)?;

assert_eq!(pos_five.saturating_neg(), neg_five);
assert_eq!(min.saturating_neg(), max);
assert_eq!(max.saturating_neg(), min_plus_one);

pub const fn wrapping_neg(self) -> NonZeroI128

Wrapping (modular) negation. Computes -self, wrapping around at the boundary of the type.

See i128::wrapping_neg for documentation on overflow behaviour.

Example

let pos_five = NonZeroI128::new(5)?;
let neg_five = NonZeroI128::new(-5)?;
let min = NonZeroI128::new(i128::MIN)?;

assert_eq!(pos_five.wrapping_neg(), neg_five);
assert_eq!(min.wrapping_neg(), min);

impl NonZeroI128

pub const fn checked_mul(self, other: NonZeroI128) -> Option<NonZeroI128>

Multiplies two non-zero integers together. Checks for overflow and returns None on overflow. As a consequence, the result cannot wrap to zero.

Examples

let two = NonZeroI128::new(2)?;
let four = NonZeroI128::new(4)?;
let max = NonZeroI128::new(i128::MAX)?;

assert_eq!(Some(four), two.checked_mul(two));
assert_eq!(None, max.checked_mul(two));

pub const fn saturating_mul(self, other: NonZeroI128) -> NonZeroI128

Multiplies two non-zero integers together. Return NonZeroI128::MAX on overflow.

Examples

let two = NonZeroI128::new(2)?;
let four = NonZeroI128::new(4)?;
let max = NonZeroI128::new(i128::MAX)?;

assert_eq!(four, two.saturating_mul(two));
assert_eq!(max, four.saturating_mul(max));

pub const unsafe fn unchecked_mul(self, other: NonZeroI128) -> NonZeroI128

🔬This is a nightly-only experimental API. (nonzero_ops #84186)

Multiplies two non-zero integers together, assuming overflow cannot occur. Overflow is unchecked, and it is undefined behaviour to overflow even if the result would wrap to a non-zero value. The behaviour is undefined as soon as self * rhs > i128::MAX, or self * rhs < i128::MIN.

Examples

#![feature(nonzero_ops)]

let two = NonZeroI128::new(2)?;
let four = NonZeroI128::new(4)?;

assert_eq!(four, unsafe { two.unchecked_mul(two) });

pub const fn checked_pow(self, other: u32) -> Option<NonZeroI128>

Raises non-zero value to an integer power. Checks for overflow and returns None on overflow. As a consequence, the result cannot wrap to zero.

Examples

let three = NonZeroI128::new(3)?;
let twenty_seven = NonZeroI128::new(27)?;
let half_max = NonZeroI128::new(i128::MAX / 2)?;

assert_eq!(Some(twenty_seven), three.checked_pow(3));
assert_eq!(None, half_max.checked_pow(3));

pub const fn saturating_pow(self, other: u32) -> NonZeroI128

Raise non-zero value to an integer power. Return NonZeroI128::MIN or NonZeroI128::MAX on overflow.

Examples

let three = NonZeroI128::new(3)?;
let twenty_seven = NonZeroI128::new(27)?;
let max = NonZeroI128::new(i128::MAX)?;

assert_eq!(twenty_seven, three.saturating_pow(3));
assert_eq!(max, max.saturating_pow(3));

impl NonZeroI128

pub const MIN: NonZeroI128 = _

The smallest value that can be represented by this non-zero integer type, equal to i128::MIN.

Note: While most integer types are defined for every whole number between MIN and MAX, signed non-zero integers are a special case. They have a “gap” at 0.

Examples

assert_eq!(NonZeroI128::MIN.get(), i128::MIN);

pub const MAX: NonZeroI128 = _

The largest value that can be represented by this non-zero integer type, equal to i128::MAX.

Note: While most integer types are defined for every whole number between MIN and MAX, signed non-zero integers are a special case. They have a “gap” at 0.

Examples

assert_eq!(NonZeroI128::MAX.get(), i128::MAX);

impl NonZeroI128

pub const BITS: u32 = 128u32

The size of this non-zero integer type in bits.

This value is equal to i128::BITS.

Examples

assert_eq!(NonZeroI128::BITS, i128::BITS);

Trait Implementations

impl Binary for NonZeroI128

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

Formats the value using the given formatter.

impl BitOr<NonZeroI128> for i128

type Output = NonZeroI128

The resulting type after applying the | operator.

fn bitor(self, rhs: NonZeroI128) -> <i128 as BitOr<NonZeroI128>>::Output

Performs the | operation.

impl BitOr<i128> for NonZeroI128

type Output = NonZeroI128

The resulting type after applying the | operator.

fn bitor(self, rhs: i128) -> <NonZeroI128 as BitOr<i128>>::Output

Performs the | operation.

impl BitOr for NonZeroI128

type Output = NonZeroI128

The resulting type after applying the | operator.

fn bitor(self, rhs: NonZeroI128) -> <NonZeroI128 as BitOr>::Output

Performs the | operation.

impl BitOrAssign<i128> for NonZeroI128

fn bitor_assign(&mut self, rhs: i128)

Performs the |= operation.

impl BitOrAssign for NonZeroI128

fn bitor_assign(&mut self, rhs: NonZeroI128)

Performs the |= operation.

impl Clone for NonZeroI128

fn clone(&self) -> NonZeroI128

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for NonZeroI128

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

Formats the value using the given formatter.

impl Display for NonZeroI128

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

Formats the value using the given formatter.

impl From<NonZeroI128> for i128

fn from(nonzero: NonZeroI128) -> i128

Converts a NonZeroI128 into an i128

impl From<NonZeroI16> for NonZeroI128

fn from(small: NonZeroI16) -> NonZeroI128

Converts NonZeroI16 to NonZeroI128 losslessly.

impl From<NonZeroI32> for NonZeroI128

fn from(small: NonZeroI32) -> NonZeroI128

Converts NonZeroI32 to NonZeroI128 losslessly.

impl From<NonZeroI64> for NonZeroI128

fn from(small: NonZeroI64) -> NonZeroI128

Converts NonZeroI64 to NonZeroI128 losslessly.

impl From<NonZeroI8> for NonZeroI128

fn from(small: NonZeroI8) -> NonZeroI128

Converts NonZeroI8 to NonZeroI128 losslessly.

impl From<NonZeroU16> for NonZeroI128

fn from(small: NonZeroU16) -> NonZeroI128

Converts NonZeroU16 to NonZeroI128 losslessly.

impl From<NonZeroU32> for NonZeroI128

fn from(small: NonZeroU32) -> NonZeroI128

Converts NonZeroU32 to NonZeroI128 losslessly.

impl From<NonZeroU64> for NonZeroI128

fn from(small: NonZeroU64) -> NonZeroI128

Converts NonZeroU64 to NonZeroI128 losslessly.

impl From<NonZeroU8> for NonZeroI128

fn from(small: NonZeroU8) -> NonZeroI128

Converts NonZeroU8 to NonZeroI128 losslessly.

impl FromStr for NonZeroI128

type Err = ParseIntError

The associated error which can be returned from parsing.

fn from_str(src: &str) -> Result<NonZeroI128, <NonZeroI128 as FromStr>::Err>

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

impl Hash for NonZeroI128

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

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 LowerHex for NonZeroI128

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

Formats the value using the given formatter.

impl Neg for &NonZeroI128

type Output = <NonZeroI128 as Neg>::Output

The resulting type after applying the - operator.

fn neg(self) -> <NonZeroI128 as Neg>::Output

Performs the unary - operation.

impl Neg for NonZeroI128

type Output = NonZeroI128

The resulting type after applying the - operator.

fn neg(self) -> NonZeroI128

Performs the unary - operation.

impl Octal for NonZeroI128

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

Formats the value using the given formatter.

impl Ord for NonZeroI128

fn cmp(&self, other: &NonZeroI128) -> Ordering

This method returns an Ordering between self and other.

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

Compares and returns the maximum of two values.

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

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd,

Restrict a value to a certain interval.

impl PartialEq for NonZeroI128

fn eq(&self, other: &NonZeroI128) -> bool

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

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

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

impl PartialOrd for NonZeroI128

fn partial_cmp(&self, other: &NonZeroI128) -> Option<Ordering>

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

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

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

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

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

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

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

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

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

impl TryFrom<NonZeroI128> for NonZeroI16

fn try_from( value: NonZeroI128 ) -> Result<NonZeroI16, <NonZeroI16 as TryFrom<NonZeroI128>>::Error>

Attempts to convert NonZeroI128 to NonZeroI16.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI128> for NonZeroI32

fn try_from( value: NonZeroI128 ) -> Result<NonZeroI32, <NonZeroI32 as TryFrom<NonZeroI128>>::Error>

Attempts to convert NonZeroI128 to NonZeroI32.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI128> for NonZeroI64

fn try_from( value: NonZeroI128 ) -> Result<NonZeroI64, <NonZeroI64 as TryFrom<NonZeroI128>>::Error>

Attempts to convert NonZeroI128 to NonZeroI64.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI128> for NonZeroI8

fn try_from( value: NonZeroI128 ) -> Result<NonZeroI8, <NonZeroI8 as TryFrom<NonZeroI128>>::Error>

Attempts to convert NonZeroI128 to NonZeroI8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI128> for NonZeroIsize

fn try_from( value: NonZeroI128 ) -> Result<NonZeroIsize, <NonZeroIsize as TryFrom<NonZeroI128>>::Error>

Attempts to convert NonZeroI128 to NonZeroIsize.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI128> for NonZeroU128

fn try_from( value: NonZeroI128 ) -> Result<NonZeroU128, <NonZeroU128 as TryFrom<NonZeroI128>>::Error>

Attempts to convert NonZeroI128 to NonZeroU128.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI128> for NonZeroU16

fn try_from( value: NonZeroI128 ) -> Result<NonZeroU16, <NonZeroU16 as TryFrom<NonZeroI128>>::Error>

Attempts to convert NonZeroI128 to NonZeroU16.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI128> for NonZeroU32

fn try_from( value: NonZeroI128 ) -> Result<NonZeroU32, <NonZeroU32 as TryFrom<NonZeroI128>>::Error>

Attempts to convert NonZeroI128 to NonZeroU32.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI128> for NonZeroU64

fn try_from( value: NonZeroI128 ) -> Result<NonZeroU64, <NonZeroU64 as TryFrom<NonZeroI128>>::Error>

Attempts to convert NonZeroI128 to NonZeroU64.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI128> for NonZeroU8

fn try_from( value: NonZeroI128 ) -> Result<NonZeroU8, <NonZeroU8 as TryFrom<NonZeroI128>>::Error>

Attempts to convert NonZeroI128 to NonZeroU8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI128> for NonZeroUsize

fn try_from( value: NonZeroI128 ) -> Result<NonZeroUsize, <NonZeroUsize as TryFrom<NonZeroI128>>::Error>

Attempts to convert NonZeroI128 to NonZeroUsize.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroIsize> for NonZeroI128

fn try_from( value: NonZeroIsize ) -> Result<NonZeroI128, <NonZeroI128 as TryFrom<NonZeroIsize>>::Error>

Attempts to convert NonZeroIsize to NonZeroI128.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroU128> for NonZeroI128

fn try_from( value: NonZeroU128 ) -> Result<NonZeroI128, <NonZeroI128 as TryFrom<NonZeroU128>>::Error>

Attempts to convert NonZeroU128 to NonZeroI128.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroUsize> for NonZeroI128

fn try_from( value: NonZeroUsize ) -> Result<NonZeroI128, <NonZeroI128 as TryFrom<NonZeroUsize>>::Error>

Attempts to convert NonZeroUsize to NonZeroI128.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<i128> for NonZeroI128

fn try_from( value: i128 ) -> Result<NonZeroI128, <NonZeroI128 as TryFrom<i128>>::Error>

Attempts to convert i128 to NonZeroI128.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl UpperHex for NonZeroI128

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

Formats the value using the given formatter.

impl Copy for NonZeroI128

impl Eq for NonZeroI128

impl StructuralEq for NonZeroI128

impl StructuralPartialEq for NonZeroI128