Struct core::num::NonZeroI64

pub struct NonZeroI64(/* private fields */);

An integer that is known not to equal zero.

This enables some memory layout optimization. For example, Option<NonZeroI64> is the same size as i64:

use std::mem::size_of;
assert_eq!(size_of::<Option<core::num::NonZeroI64>>(), size_of::<i64>());

Layout

NonZeroI64 is guaranteed to have the same layout and bit validity as i64 with the exception that 0 is not a valid instance. Option<NonZeroI64> is guaranteed to be compatible with i64, including in FFI.

Thanks to the null pointer optimization, NonZeroI64 and Option<NonZeroI64> are guaranteed to have the same size and alignment:

use std::num::NonZeroI64;

assert_eq!(size_of::<NonZeroI64>(), size_of::<Option<NonZeroI64>>());
assert_eq!(align_of::<NonZeroI64>(), align_of::<Option<NonZeroI64>>());

Implementations

impl NonZeroI64

pub const unsafe fn new_unchecked(n: i64) -> Self

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: i64) -> Option<Self>

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

pub unsafe fn from_mut_unchecked(n: &mut i64) -> &mut Self

🔬This is a nightly-only experimental API. (nonzero_from_mut #106290)

Converts a primitive mutable reference to a non-zero mutable reference without checking whether the referenced value is non-zero. This results in undefined behavior if *n is zero.

Safety

The referenced value must not be currently zero.

pub fn from_mut(n: &mut i64) -> Option<&mut Self>

🔬This is a nightly-only experimental API. (nonzero_from_mut #106290)

Converts a primitive mutable reference to a non-zero mutable reference if the referenced integer is not zero.

pub const fn get(self) -> i64

Returns the value as a primitive type.

pub const BITS: u32 = 64u32

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

This value is equal to i64::BITS.

Examples

assert_eq!(NonZeroI64::BITS, i64::BITS);

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::NonZeroI64::new(-1i64).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::NonZeroI64::new(0b0101000).unwrap();

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

pub fn count_ones(self) -> NonZeroU32

🔬This is a nightly-only experimental API. (non_zero_count_ones #120287)

Returns the number of ones in the binary representation of self.

Examples

Basic usage:

#![feature(non_zero_count_ones)]

let one = num::NonZeroU32::new(1)?;
let three = num::NonZeroU32::new(3)?;
let a = NonZeroI64::new(0b100_0000)?;
let b = NonZeroI64::new(0b100_0011)?;

assert_eq!(a.count_ones(), one);
assert_eq!(b.count_ones(), three);

pub const MIN: Self = _

The smallest value that can be represented by this non-zero integer type, equal to i64::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!(NonZeroI64::MIN.get(), i64::MIN);

pub const MAX: Self = _

The largest value that can be represented by this non-zero integer type, equal to i64::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!(NonZeroI64::MAX.get(), i64::MAX);

pub const fn abs(self) -> Self

Computes the absolute value of self. See i64::abs for documentation on overflow behaviour.

Example

let pos = NonZeroI64::new(1)?;
let neg = NonZeroI64::new(-1)?;

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

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

Checked absolute value. Checks for overflow and returns None if self == NonZeroI64::MIN. The result cannot be zero.

Example

let pos = NonZeroI64::new(1)?;
let neg = NonZeroI64::new(-1)?;
let min = NonZeroI64::new(i64::MIN)?;

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

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

Computes the absolute value of self, with overflow information, see i64::overflowing_abs.

Example

let pos = NonZeroI64::new(1)?;
let neg = NonZeroI64::new(-1)?;
let min = NonZeroI64::new(i64::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) -> Self

Saturating absolute value, see i64::saturating_abs.

Example

let pos = NonZeroI64::new(1)?;
let neg = NonZeroI64::new(-1)?;
let min = NonZeroI64::new(i64::MIN)?;
let min_plus = NonZeroI64::new(i64::MIN + 1)?;
let max = NonZeroI64::new(i64::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) -> Self

Wrapping absolute value, see i64::wrapping_abs.

Example

let pos = NonZeroI64::new(1)?;
let neg = NonZeroI64::new(-1)?;
let min = NonZeroI64::new(i64::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) -> NonZeroU64

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

Example

let u_pos = NonZeroU64::new(1)?;
let i_pos = NonZeroI64::new(1)?;
let i_neg = NonZeroI64::new(-1)?;
let i_min = NonZeroI64::new(i64::MIN)?;
let u_max = NonZeroU64::new(u64::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 = NonZeroI64::new(5)?;
let neg_five = NonZeroI64::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 = NonZeroI64::new(5)?;
let neg_five = NonZeroI64::new(-5)?;

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

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

Checked negation. Computes -self, returning None if self == NonZeroI64::MIN.

Example

let pos_five = NonZeroI64::new(5)?;
let neg_five = NonZeroI64::new(-5)?;
let min = NonZeroI64::new(i64::MIN)?;

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

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

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

See i64::overflowing_neg for documentation on overflow behaviour.

Example

let pos_five = NonZeroI64::new(5)?;
let neg_five = NonZeroI64::new(-5)?;
let min = NonZeroI64::new(i64::MIN)?;

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

pub const fn saturating_neg(self) -> Self

Saturating negation. Computes -self, returning NonZeroI64::MAX if self == NonZeroI64::MIN instead of overflowing.

Example

let pos_five = NonZeroI64::new(5)?;
let neg_five = NonZeroI64::new(-5)?;
let min = NonZeroI64::new(i64::MIN)?;
let min_plus_one = NonZeroI64::new(i64::MIN + 1)?;
let max = NonZeroI64::new(i64::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) -> Self

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

See i64::wrapping_neg for documentation on overflow behaviour.

Example

let pos_five = NonZeroI64::new(5)?;
let neg_five = NonZeroI64::new(-5)?;
let min = NonZeroI64::new(i64::MIN)?;

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

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

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 = NonZeroI64::new(2)?;
let four = NonZeroI64::new(4)?;
let max = NonZeroI64::new(i64::MAX)?;

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

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

Multiplies two non-zero integers together. Return NonZeroI64::MAX on overflow.

Examples

let two = NonZeroI64::new(2)?;
let four = NonZeroI64::new(4)?;
let max = NonZeroI64::new(i64::MAX)?;

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

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

🔬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 > i64::MAX, or self * rhs < i64::MIN.

Examples

#![feature(nonzero_ops)]

let two = NonZeroI64::new(2)?;
let four = NonZeroI64::new(4)?;

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

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

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 = NonZeroI64::new(3)?;
let twenty_seven = NonZeroI64::new(27)?;
let half_max = NonZeroI64::new(i64::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) -> Self

Raise non-zero value to an integer power. Return NonZeroI64::MIN or NonZeroI64::MAX on overflow.

Examples

let three = NonZeroI64::new(3)?;
let twenty_seven = NonZeroI64::new(27)?;
let max = NonZeroI64::new(i64::MAX)?;

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

Trait Implementations

impl Binary for NonZeroI64

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

Formats the value using the given formatter.

impl BitOr<NonZeroI64> for i64

type Output = NonZeroI64

The resulting type after applying the | operator.

fn bitor(self, rhs: NonZeroI64) -> Self::Output

Performs the | operation.

impl BitOr<i64> for NonZeroI64

type Output = NonZeroI64

The resulting type after applying the | operator.

fn bitor(self, rhs: i64) -> Self::Output

Performs the | operation.

impl BitOr for NonZeroI64

type Output = NonZeroI64

The resulting type after applying the | operator.

fn bitor(self, rhs: Self) -> Self::Output

Performs the | operation.

impl BitOrAssign<i64> for NonZeroI64

fn bitor_assign(&mut self, rhs: i64)

Performs the |= operation.

impl BitOrAssign for NonZeroI64

fn bitor_assign(&mut self, rhs: Self)

Performs the |= operation.

impl Clone for NonZeroI64

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for NonZeroI64

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

Formats the value using the given formatter.

impl Display for NonZeroI64

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

Formats the value using the given formatter.

impl From<NonZeroI16> for NonZeroI64

fn from(small: NonZeroI16) -> Self

Converts NonZeroI16 to NonZeroI64 losslessly.

impl From<NonZeroI32> for NonZeroI64

fn from(small: NonZeroI32) -> Self

Converts NonZeroI32 to NonZeroI64 losslessly.

impl From<NonZeroI64> for NonZeroI128

fn from(small: NonZeroI64) -> Self

Converts NonZeroI64 to NonZeroI128 losslessly.

impl From<NonZeroI64> for i64

fn from(nonzero: NonZeroI64) -> Self

Converts a NonZeroI64 into an i64

impl From<NonZeroI8> for NonZeroI64

fn from(small: NonZeroI8) -> Self

Converts NonZeroI8 to NonZeroI64 losslessly.

impl From<NonZeroU16> for NonZeroI64

fn from(small: NonZeroU16) -> Self

Converts NonZeroU16 to NonZeroI64 losslessly.

impl From<NonZeroU32> for NonZeroI64

fn from(small: NonZeroU32) -> Self

Converts NonZeroU32 to NonZeroI64 losslessly.

impl From<NonZeroU8> for NonZeroI64

fn from(small: NonZeroU8) -> Self

Converts NonZeroU8 to NonZeroI64 losslessly.

impl FromStr for NonZeroI64

type Err = ParseIntError

The associated error which can be returned from parsing.

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

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

impl Hash for NonZeroI64

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

where H: Hasher,

Feeds this value into the given Hasher.

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

where Self: Sized,

Feeds a slice of this type into the given Hasher.

impl LowerHex for NonZeroI64

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

Formats the value using the given formatter.

impl Neg for &NonZeroI64

type Output = <NonZeroI64 as Neg>::Output

The resulting type after applying the - operator.

fn neg(self) -> <NonZeroI64 as Neg>::Output

Performs the unary - operation.

impl Neg for NonZeroI64

type Output = NonZeroI64

The resulting type after applying the - operator.

fn neg(self) -> Self

Performs the unary - operation.

impl Octal for NonZeroI64

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

Formats the value using the given formatter.

impl Ord for NonZeroI64

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

This method returns an Ordering between self and other.

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

Compares and returns the maximum of two values.

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

Compares and returns the minimum of two values.

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

Restrict a value to a certain interval.

impl PartialEq for NonZeroI64

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

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

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

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

impl PartialOrd for NonZeroI64

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

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

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

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

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

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

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

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

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

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

impl TryFrom<NonZeroI128> for NonZeroI64

fn try_from(value: NonZeroI128) -> Result<Self, Self::Error>

Attempts to convert NonZeroI128 to NonZeroI64.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI64> for NonZeroI16

fn try_from(value: NonZeroI64) -> Result<Self, Self::Error>

Attempts to convert NonZeroI64 to NonZeroI16.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI64> for NonZeroI32

fn try_from(value: NonZeroI64) -> Result<Self, Self::Error>

Attempts to convert NonZeroI64 to NonZeroI32.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI64> for NonZeroI8

fn try_from(value: NonZeroI64) -> Result<Self, Self::Error>

Attempts to convert NonZeroI64 to NonZeroI8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI64> for NonZeroIsize

fn try_from(value: NonZeroI64) -> Result<Self, Self::Error>

Attempts to convert NonZeroI64 to NonZeroIsize.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI64> for NonZeroU128

fn try_from(value: NonZeroI64) -> Result<Self, Self::Error>

Attempts to convert NonZeroI64 to NonZeroU128.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI64> for NonZeroU16

fn try_from(value: NonZeroI64) -> Result<Self, Self::Error>

Attempts to convert NonZeroI64 to NonZeroU16.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI64> for NonZeroU32

fn try_from(value: NonZeroI64) -> Result<Self, Self::Error>

Attempts to convert NonZeroI64 to NonZeroU32.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI64> for NonZeroU64

fn try_from(value: NonZeroI64) -> Result<Self, Self::Error>

Attempts to convert NonZeroI64 to NonZeroU64.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI64> for NonZeroU8

fn try_from(value: NonZeroI64) -> Result<Self, Self::Error>

Attempts to convert NonZeroI64 to NonZeroU8.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroI64> for NonZeroUsize

fn try_from(value: NonZeroI64) -> Result<Self, Self::Error>

Attempts to convert NonZeroI64 to NonZeroUsize.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroIsize> for NonZeroI64

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

Attempts to convert NonZeroIsize to NonZeroI64.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroU128> for NonZeroI64

fn try_from(value: NonZeroU128) -> Result<Self, Self::Error>

Attempts to convert NonZeroU128 to NonZeroI64.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroU64> for NonZeroI64

fn try_from(value: NonZeroU64) -> Result<Self, Self::Error>

Attempts to convert NonZeroU64 to NonZeroI64.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZeroUsize> for NonZeroI64

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

Attempts to convert NonZeroUsize to NonZeroI64.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<i64> for NonZeroI64

fn try_from(value: i64) -> Result<Self, Self::Error>

Attempts to convert i64 to NonZeroI64.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl UpperHex for NonZeroI64

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

Formats the value using the given formatter.

impl Copy for NonZeroI64

impl Eq for NonZeroI64

impl StructuralEq for NonZeroI64

impl StructuralPartialEq for NonZeroI64