Struct core::num::NonZeroI8

1.34.0 · source ·
pub struct NonZeroI8(/* private fields */);
Expand description

An integer that is known not to equal zero.

This enables some memory layout optimization. For example, Option<NonZeroI8> is the same size as i8:

use std::mem::size_of;
assert_eq!(size_of::<Option<core::num::NonZeroI8>>(), size_of::<i8>());
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Layout

NonZeroI8 is guaranteed to have the same layout and bit validity as i8 with the exception that 0 is not a valid instance. Option<NonZeroI8> is guaranteed to be compatible with i8, including in FFI.

Thanks to the null pointer optimization, NonZeroI8 and Option<NonZeroI8> are guaranteed to have the same size and alignment:

use std::num::NonZeroI8;

assert_eq!(size_of::<NonZeroI8>(), size_of::<Option<NonZeroI8>>());
assert_eq!(align_of::<NonZeroI8>(), align_of::<Option<NonZeroI8>>());
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Implementations§

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impl NonZeroI8

const: 1.34.0 · source

pub const unsafe fn new_unchecked(n: i8) -> 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.

const: 1.47.0 · source

pub const fn new(n: i8) -> Option<Self>

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

const: 1.34.0 · source

pub const fn get(self) -> i8

Returns the value as a primitive type.

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impl NonZeroI8

1.53.0 (const: 1.53.0) · source

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::NonZeroI8::new(-1i8).unwrap();

assert_eq!(n.leading_zeros(), 0);
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1.53.0 (const: 1.53.0) · source

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::NonZeroI8::new(0b0101000).unwrap();

assert_eq!(n.trailing_zeros(), 3);
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impl NonZeroI8

1.64.0 (const: 1.64.0) · source

pub const fn abs(self) -> NonZeroI8

Computes the absolute value of self. See i8::abs for documentation on overflow behaviour.

Example
let pos = NonZeroI8::new(1)?;
let neg = NonZeroI8::new(-1)?;

assert_eq!(pos, pos.abs());
assert_eq!(pos, neg.abs());
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1.64.0 (const: 1.64.0) · source

pub const fn checked_abs(self) -> Option<NonZeroI8>

Checked absolute value. Checks for overflow and returns None if self == NonZeroI8::MIN. The result cannot be zero.

Example
let pos = NonZeroI8::new(1)?;
let neg = NonZeroI8::new(-1)?;
let min = NonZeroI8::new(i8::MIN)?;

assert_eq!(Some(pos), neg.checked_abs());
assert_eq!(None, min.checked_abs());
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1.64.0 (const: 1.64.0) · source

pub const fn overflowing_abs(self) -> (NonZeroI8, bool)

Computes the absolute value of self, with overflow information, see i8::overflowing_abs.

Example
let pos = NonZeroI8::new(1)?;
let neg = NonZeroI8::new(-1)?;
let min = NonZeroI8::new(i8::MIN)?;

assert_eq!((pos, false), pos.overflowing_abs());
assert_eq!((pos, false), neg.overflowing_abs());
assert_eq!((min, true), min.overflowing_abs());
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1.64.0 (const: 1.64.0) · source

pub const fn saturating_abs(self) -> NonZeroI8

Saturating absolute value, see i8::saturating_abs.

Example
let pos = NonZeroI8::new(1)?;
let neg = NonZeroI8::new(-1)?;
let min = NonZeroI8::new(i8::MIN)?;
let min_plus = NonZeroI8::new(i8::MIN + 1)?;
let max = NonZeroI8::new(i8::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());
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1.64.0 (const: 1.64.0) · source

pub const fn wrapping_abs(self) -> NonZeroI8

Wrapping absolute value, see i8::wrapping_abs.

Example
let pos = NonZeroI8::new(1)?;
let neg = NonZeroI8::new(-1)?;
let min = NonZeroI8::new(i8::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());
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1.64.0 (const: 1.64.0) · source

pub const fn unsigned_abs(self) -> NonZeroU8

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

Example

let u_pos = NonZeroU8::new(1)?;
let i_pos = NonZeroI8::new(1)?;
let i_neg = NonZeroI8::new(-1)?;
let i_min = NonZeroI8::new(i8::MIN)?;
let u_max = NonZeroU8::new(u8::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());
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1.71.0 (const: 1.71.0) · source

pub const fn is_positive(self) -> bool

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

Example
let pos_five = NonZeroI8::new(5)?;
let neg_five = NonZeroI8::new(-5)?;

assert!(pos_five.is_positive());
assert!(!neg_five.is_positive());
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1.71.0 (const: 1.71.0) · source

pub const fn is_negative(self) -> bool

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

Example
let pos_five = NonZeroI8::new(5)?;
let neg_five = NonZeroI8::new(-5)?;

assert!(neg_five.is_negative());
assert!(!pos_five.is_negative());
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1.71.0 (const: 1.71.0) · source

pub const fn checked_neg(self) -> Option<NonZeroI8>

Checked negation. Computes -self, returning None if self == NonZeroI8::MIN.

Example
let pos_five = NonZeroI8::new(5)?;
let neg_five = NonZeroI8::new(-5)?;
let min = NonZeroI8::new(i8::MIN)?;

assert_eq!(pos_five.checked_neg(), Some(neg_five));
assert_eq!(min.checked_neg(), None);
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1.71.0 (const: 1.71.0) · source

pub const fn overflowing_neg(self) -> (NonZeroI8, bool)

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

See i8::overflowing_neg for documentation on overflow behaviour.

Example
let pos_five = NonZeroI8::new(5)?;
let neg_five = NonZeroI8::new(-5)?;
let min = NonZeroI8::new(i8::MIN)?;

assert_eq!(pos_five.overflowing_neg(), (neg_five, false));
assert_eq!(min.overflowing_neg(), (min, true));
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1.71.0 (const: 1.71.0) · source

pub const fn saturating_neg(self) -> NonZeroI8

Saturating negation. Computes -self, returning NonZeroI8::MAX if self == NonZeroI8::MIN instead of overflowing.

Example
let pos_five = NonZeroI8::new(5)?;
let neg_five = NonZeroI8::new(-5)?;
let min = NonZeroI8::new(i8::MIN)?;
let min_plus_one = NonZeroI8::new(i8::MIN + 1)?;
let max = NonZeroI8::new(i8::MAX)?;

assert_eq!(pos_five.saturating_neg(), neg_five);
assert_eq!(min.saturating_neg(), max);
assert_eq!(max.saturating_neg(), min_plus_one);
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1.71.0 (const: 1.71.0) · source

pub const fn wrapping_neg(self) -> NonZeroI8

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

See i8::wrapping_neg for documentation on overflow behaviour.

Example
let pos_five = NonZeroI8::new(5)?;
let neg_five = NonZeroI8::new(-5)?;
let min = NonZeroI8::new(i8::MIN)?;

assert_eq!(pos_five.wrapping_neg(), neg_five);
assert_eq!(min.wrapping_neg(), min);
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impl NonZeroI8

1.64.0 (const: 1.64.0) · source

pub const fn checked_mul(self, other: NonZeroI8) -> Option<NonZeroI8>

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 = NonZeroI8::new(2)?;
let four = NonZeroI8::new(4)?;
let max = NonZeroI8::new(i8::MAX)?;

assert_eq!(Some(four), two.checked_mul(two));
assert_eq!(None, max.checked_mul(two));
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1.64.0 (const: 1.64.0) · source

pub const fn saturating_mul(self, other: NonZeroI8) -> NonZeroI8

Multiplies two non-zero integers together. Return NonZeroI8::MAX on overflow.

Examples
let two = NonZeroI8::new(2)?;
let four = NonZeroI8::new(4)?;
let max = NonZeroI8::new(i8::MAX)?;

assert_eq!(four, two.saturating_mul(two));
assert_eq!(max, four.saturating_mul(max));
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pub const unsafe fn unchecked_mul(self, other: NonZeroI8) -> NonZeroI8

🔬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 > i8::MAX, or self * rhs < i8::MIN.

Examples
#![feature(nonzero_ops)]

let two = NonZeroI8::new(2)?;
let four = NonZeroI8::new(4)?;

assert_eq!(four, unsafe { two.unchecked_mul(two) });
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1.64.0 (const: 1.64.0) · source

pub const fn checked_pow(self, other: u32) -> Option<NonZeroI8>

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 = NonZeroI8::new(3)?;
let twenty_seven = NonZeroI8::new(27)?;
let half_max = NonZeroI8::new(i8::MAX / 2)?;

assert_eq!(Some(twenty_seven), three.checked_pow(3));
assert_eq!(None, half_max.checked_pow(3));
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1.64.0 (const: 1.64.0) · source

pub const fn saturating_pow(self, other: u32) -> NonZeroI8

Raise non-zero value to an integer power. Return NonZeroI8::MIN or NonZeroI8::MAX on overflow.

Examples
let three = NonZeroI8::new(3)?;
let twenty_seven = NonZeroI8::new(27)?;
let max = NonZeroI8::new(i8::MAX)?;

assert_eq!(twenty_seven, three.saturating_pow(3));
assert_eq!(max, max.saturating_pow(3));
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impl NonZeroI8

1.70.0 · source

pub const MIN: Self = _

The smallest value that can be represented by this non-zero integer type, equal to i8::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!(NonZeroI8::MIN.get(), i8::MIN);
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1.70.0 · source

pub const MAX: Self = _

The largest value that can be represented by this non-zero integer type, equal to i8::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!(NonZeroI8::MAX.get(), i8::MAX);
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impl NonZeroI8

1.67.0 · source

pub const BITS: u32 = 8u32

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

This value is equal to i8::BITS.

Examples

assert_eq!(NonZeroI8::BITS, i8::BITS);
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Trait Implementations§

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impl Binary for NonZeroI8

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

Formats the value using the given formatter.
1.45.0 · source§

impl BitOr<NonZeroI8> for i8

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type Output = NonZeroI8

The resulting type after applying the | operator.
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fn bitor(self, rhs: NonZeroI8) -> Self::Output

Performs the | operation. Read more
1.45.0 · source§

impl BitOr<i8> for NonZeroI8

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type Output = NonZeroI8

The resulting type after applying the | operator.
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fn bitor(self, rhs: i8) -> Self::Output

Performs the | operation. Read more
1.45.0 · source§

impl BitOr for NonZeroI8

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type Output = NonZeroI8

The resulting type after applying the | operator.
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fn bitor(self, rhs: Self) -> Self::Output

Performs the | operation. Read more
1.45.0 · source§

impl BitOrAssign<i8> for NonZeroI8

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fn bitor_assign(&mut self, rhs: i8)

Performs the |= operation. Read more
1.45.0 · source§

impl BitOrAssign for NonZeroI8

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fn bitor_assign(&mut self, rhs: Self)

Performs the |= operation. Read more
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impl Clone for NonZeroI8

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fn clone(&self) -> NonZeroI8

Returns a copy of the value. Read more
1.0.0 · source§

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

Performs copy-assignment from source. Read more
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impl Debug for NonZeroI8

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

Formats the value using the given formatter. Read more
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impl Display for NonZeroI8

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

Formats the value using the given formatter. Read more
1.41.0 · source§

impl From<NonZeroI8> for NonZeroI128

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fn from(small: NonZeroI8) -> Self

Converts NonZeroI8 to NonZeroI128 losslessly.

1.41.0 · source§

impl From<NonZeroI8> for NonZeroI16

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fn from(small: NonZeroI8) -> Self

Converts NonZeroI8 to NonZeroI16 losslessly.

1.41.0 · source§

impl From<NonZeroI8> for NonZeroI32

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fn from(small: NonZeroI8) -> Self

Converts NonZeroI8 to NonZeroI32 losslessly.

1.41.0 · source§

impl From<NonZeroI8> for NonZeroI64

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fn from(small: NonZeroI8) -> Self

Converts NonZeroI8 to NonZeroI64 losslessly.

1.41.0 · source§

impl From<NonZeroI8> for NonZeroIsize

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fn from(small: NonZeroI8) -> Self

Converts NonZeroI8 to NonZeroIsize losslessly.

1.31.0 · source§

impl From<NonZeroI8> for i8

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fn from(nonzero: NonZeroI8) -> Self

Converts a NonZeroI8 into an i8

1.35.0 · source§

impl FromStr for NonZeroI8

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type Err = ParseIntError

The associated error which can be returned from parsing.
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fn from_str(src: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type. Read more
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impl Hash for NonZeroI8

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

Feeds this value into the given Hasher. Read more
1.3.0 · source§

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

Feeds a slice of this type into the given Hasher. Read more
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impl LowerHex for NonZeroI8

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

Formats the value using the given formatter.
1.71.0 · source§

impl Neg for &NonZeroI8

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type Output = <NonZeroI8 as Neg>::Output

The resulting type after applying the - operator.
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fn neg(self) -> <NonZeroI8 as Neg>::Output

Performs the unary - operation. Read more
1.71.0 · source§

impl Neg for NonZeroI8

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type Output = NonZeroI8

The resulting type after applying the - operator.
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fn neg(self) -> NonZeroI8

Performs the unary - operation. Read more
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impl Octal for NonZeroI8

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

Formats the value using the given formatter.
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impl Ord for NonZeroI8

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fn cmp(&self, other: &NonZeroI8) -> Ordering

This method returns an Ordering between self and other. Read more
1.21.0 · source§

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

Compares and returns the maximum of two values. Read more
1.21.0 · source§

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

Compares and returns the minimum of two values. Read more
1.50.0 · source§

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

Restrict a value to a certain interval. Read more
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impl PartialEq for NonZeroI8

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fn eq(&self, other: &NonZeroI8) -> bool

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

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.
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impl PartialOrd for NonZeroI8

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fn partial_cmp(&self, other: &NonZeroI8) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
1.0.0 · source§

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

This method tests less than (for self and other) and is used by the < operator. Read more
1.0.0 · source§

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

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
1.0.0 · source§

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

This method tests greater than (for self and other) and is used by the > operator. Read more
1.0.0 · source§

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

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
1.49.0 · source§

impl TryFrom<NonZeroI128> for NonZeroI8

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

Attempts to convert NonZeroI128 to NonZeroI8.

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type Error = TryFromIntError

The type returned in the event of a conversion error.
1.49.0 · source§

impl TryFrom<NonZeroI16> for NonZeroI8

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fn try_from(value: NonZeroI16) -> Result<Self, Self::Error>

Attempts to convert NonZeroI16 to NonZeroI8.

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type Error = TryFromIntError

The type returned in the event of a conversion error.
1.49.0 · source§

impl TryFrom<NonZeroI32> for NonZeroI8

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fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>

Attempts to convert NonZeroI32 to NonZeroI8.

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type Error = TryFromIntError

The type returned in the event of a conversion error.
1.49.0 · source§

impl TryFrom<NonZeroI64> for NonZeroI8

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

Attempts to convert NonZeroI64 to NonZeroI8.

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type Error = TryFromIntError

The type returned in the event of a conversion error.
1.49.0 · source§

impl TryFrom<NonZeroI8> for NonZeroU128

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fn try_from(value: NonZeroI8) -> Result<Self, Self::Error>

Attempts to convert NonZeroI8 to NonZeroU128.

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type Error = TryFromIntError

The type returned in the event of a conversion error.
1.49.0 · source§

impl TryFrom<NonZeroI8> for NonZeroU16

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fn try_from(value: NonZeroI8) -> Result<Self, Self::Error>

Attempts to convert NonZeroI8 to NonZeroU16.

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type Error = TryFromIntError

The type returned in the event of a conversion error.
1.49.0 · source§

impl TryFrom<NonZeroI8> for NonZeroU32

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fn try_from(value: NonZeroI8) -> Result<Self, Self::Error>

Attempts to convert NonZeroI8 to NonZeroU32.

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type Error = TryFromIntError

The type returned in the event of a conversion error.
1.49.0 · source§

impl TryFrom<NonZeroI8> for NonZeroU64

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fn try_from(value: NonZeroI8) -> Result<Self, Self::Error>

Attempts to convert NonZeroI8 to NonZeroU64.

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type Error = TryFromIntError

The type returned in the event of a conversion error.
1.49.0 · source§

impl TryFrom<NonZeroI8> for NonZeroU8

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fn try_from(value: NonZeroI8) -> Result<Self, Self::Error>

Attempts to convert NonZeroI8 to NonZeroU8.

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type Error = TryFromIntError

The type returned in the event of a conversion error.
1.49.0 · source§

impl TryFrom<NonZeroI8> for NonZeroUsize

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fn try_from(value: NonZeroI8) -> Result<Self, Self::Error>

Attempts to convert NonZeroI8 to NonZeroUsize.

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type Error = TryFromIntError

The type returned in the event of a conversion error.
1.49.0 · source§

impl TryFrom<NonZeroIsize> for NonZeroI8

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

Attempts to convert NonZeroIsize to NonZeroI8.

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type Error = TryFromIntError

The type returned in the event of a conversion error.
1.49.0 · source§

impl TryFrom<NonZeroU128> for NonZeroI8

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

Attempts to convert NonZeroU128 to NonZeroI8.

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type Error = TryFromIntError

The type returned in the event of a conversion error.
1.49.0 · source§

impl TryFrom<NonZeroU16> for NonZeroI8

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fn try_from(value: NonZeroU16) -> Result<Self, Self::Error>

Attempts to convert NonZeroU16 to NonZeroI8.

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type Error = TryFromIntError

The type returned in the event of a conversion error.
1.49.0 · source§

impl TryFrom<NonZeroU32> for NonZeroI8

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fn try_from(value: NonZeroU32) -> Result<Self, Self::Error>

Attempts to convert NonZeroU32 to NonZeroI8.

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type Error = TryFromIntError

The type returned in the event of a conversion error.
1.49.0 · source§

impl TryFrom<NonZeroU64> for NonZeroI8

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

Attempts to convert NonZeroU64 to NonZeroI8.

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type Error = TryFromIntError

The type returned in the event of a conversion error.
1.49.0 · source§

impl TryFrom<NonZeroU8> for NonZeroI8

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fn try_from(value: NonZeroU8) -> Result<Self, Self::Error>

Attempts to convert NonZeroU8 to NonZeroI8.

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type Error = TryFromIntError

The type returned in the event of a conversion error.
1.49.0 · source§

impl TryFrom<NonZeroUsize> for NonZeroI8

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

Attempts to convert NonZeroUsize to NonZeroI8.

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type Error = TryFromIntError

The type returned in the event of a conversion error.
1.46.0 · source§

impl TryFrom<i8> for NonZeroI8

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fn try_from(value: i8) -> Result<Self, Self::Error>

Attempts to convert i8 to NonZeroI8.

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type Error = TryFromIntError

The type returned in the event of a conversion error.
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impl UpperHex for NonZeroI8

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

Formats the value using the given formatter.
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impl Copy for NonZeroI8

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impl Eq for NonZeroI8

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impl StructuralEq for NonZeroI8

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impl StructuralPartialEq for NonZeroI8

Auto Trait Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.