Type Alias NonZeroUsize

pub type NonZeroUsize = NonZero<usize>;

core An unsigned integer that is known not to equal zero.

Re-exported from core::num:: .

---

A usize that is known not to equal zero.

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

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

Layout

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

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

use std::num::NonZeroUsize;

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

Aliased Type

struct NonZeroUsize(/* private fields */);

Implementations

impl<T> NonZero<T>

where T: ZeroablePrimitive,

pub const fn new(n: T) -> Option<NonZero<T>>

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

pub const unsafe fn new_unchecked(n: T) -> NonZero<T>

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

Safety

The value must not be zero.

pub fn from_mut(n: &mut T) -> Option<&mut NonZero<T>>

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

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

pub unsafe fn from_mut_unchecked(n: &mut T) -> &mut NonZero<T>

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

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

Safety

The referenced value must not be zero.

pub const fn get(self) -> T

Returns the contained value as a primitive type.

impl NonZero<usize>

pub const fn div_ceil(self, rhs: NonZero<usize>) -> NonZero<usize>

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

Calculates the quotient of self and rhs, rounding the result towards positive infinity.

The result is guaranteed to be non-zero.

Examples

let one = NonZero::new(1usize).unwrap();
let max = NonZero::new(usize::MAX).unwrap();
assert_eq!(one.div_ceil(max), one);

let two = NonZero::new(2usize).unwrap();
let three = NonZero::new(3usize).unwrap();
assert_eq!(three.div_ceil(two), two);

impl NonZero<usize>

pub const BITS: u32 = 64u32

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

This value is equal to usize::BITS.

Examples

assert_eq!(NonZero::<usize>::BITS, usize::BITS);

pub const MIN: NonZero<usize>

The smallest value that can be represented by this non-zero integer type, 1.

Examples

assert_eq!(NonZero::<usize>::MIN.get(), 1usize);

pub const MAX: NonZero<usize>

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

Examples

assert_eq!(NonZero::<usize>::MAX.get(), usize::MAX);

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 = NonZero::<usize>::new(usize::MAX)?;

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 = NonZero::<usize>::new(0b0101000)?;

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

pub const fn isolate_most_significant_one(self) -> NonZero<usize>

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

Returns self with only the most significant bit set.

Example

Basic usage:

#![feature(isolate_most_least_significant_one)]

let a = NonZero::<usize>::new(0b_01100100)?;
let b = NonZero::<usize>::new(0b_01000000)?;

assert_eq!(a.isolate_most_significant_one(), b);

pub const fn isolate_least_significant_one(self) -> NonZero<usize>

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

Returns self with only the least significant bit set.

Example

Basic usage:

#![feature(isolate_most_least_significant_one)]

let a = NonZero::<usize>::new(0b_01100100)?;
let b = NonZero::<usize>::new(0b_00000100)?;

assert_eq!(a.isolate_least_significant_one(), b);

pub const fn count_ones(self) -> NonZero<u32>

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

Examples

Basic usage:

let a = NonZero::<usize>::new(0b100_0000)?;
let b = NonZero::<usize>::new(0b100_0011)?;

assert_eq!(a.count_ones(), NonZero::new(1)?);
assert_eq!(b.count_ones(), NonZero::new(3)?);

pub const fn rotate_left(self, n: u32) -> NonZero<usize>

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

Shifts the bits to the left by a specified amount, n, wrapping the truncated bits to the end of the resulting integer.

Please note this isn’t the same operation as the << shifting operator!

Examples

Basic usage:

#![feature(nonzero_bitwise)]
let n = NonZero::new(0xaa00000000006e1usize)?;
let m = NonZero::new(0x6e10aa)?;

assert_eq!(n.rotate_left(12), m);

pub const fn rotate_right(self, n: u32) -> NonZero<usize>

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

Shifts the bits to the right by a specified amount, n, wrapping the truncated bits to the beginning of the resulting integer.

Please note this isn’t the same operation as the >> shifting operator!

Examples

Basic usage:

#![feature(nonzero_bitwise)]
let n = NonZero::new(0x6e10aausize)?;
let m = NonZero::new(0xaa00000000006e1)?;

assert_eq!(n.rotate_right(12), m);

pub const fn swap_bytes(self) -> NonZero<usize>

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

Reverses the byte order of the integer.

Examples

Basic usage:

#![feature(nonzero_bitwise)]
let n = NonZero::new(0x1234567890123456usize)?;
let m = n.swap_bytes();

assert_eq!(m, NonZero::new(0x5634129078563412)?);

pub const fn reverse_bits(self) -> NonZero<usize>

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

Reverses the order of bits in the integer. The least significant bit becomes the most significant bit, second least-significant bit becomes second most-significant bit, etc.

Examples

Basic usage:

#![feature(nonzero_bitwise)]
let n = NonZero::new(0x1234567890123456usize)?;
let m = n.reverse_bits();

assert_eq!(m, NonZero::new(0x6a2c48091e6a2c48)?);

pub const fn from_be(x: NonZero<usize>) -> NonZero<usize>

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

Converts an integer from big endian to the target’s endianness.

On big endian this is a no-op. On little endian the bytes are swapped.

Examples

Basic usage:

#![feature(nonzero_bitwise)]
use std::num::NonZeroUsize;
let n = NonZero::new(0x1Ausize)?;

if cfg!(target_endian = "big") {
    assert_eq!(NonZeroUsize::from_be(n), n)
} else {
    assert_eq!(NonZeroUsize::from_be(n), n.swap_bytes())
}

pub const fn from_le(x: NonZero<usize>) -> NonZero<usize>

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

Converts an integer from little endian to the target’s endianness.

On little endian this is a no-op. On big endian the bytes are swapped.

Examples

Basic usage:

#![feature(nonzero_bitwise)]
use std::num::NonZeroUsize;
let n = NonZero::new(0x1Ausize)?;

if cfg!(target_endian = "little") {
    assert_eq!(NonZeroUsize::from_le(n), n)
} else {
    assert_eq!(NonZeroUsize::from_le(n), n.swap_bytes())
}

pub const fn to_be(self) -> NonZero<usize>

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

Converts self to big endian from the target’s endianness.

On big endian this is a no-op. On little endian the bytes are swapped.

Examples

Basic usage:

#![feature(nonzero_bitwise)]
let n = NonZero::new(0x1Ausize)?;

if cfg!(target_endian = "big") {
    assert_eq!(n.to_be(), n)
} else {
    assert_eq!(n.to_be(), n.swap_bytes())
}

pub const fn to_le(self) -> NonZero<usize>

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

Converts self to little endian from the target’s endianness.

On little endian this is a no-op. On big endian the bytes are swapped.

Examples

Basic usage:

#![feature(nonzero_bitwise)]
let n = NonZero::new(0x1Ausize)?;

if cfg!(target_endian = "little") {
    assert_eq!(n.to_le(), n)
} else {
    assert_eq!(n.to_le(), n.swap_bytes())
}

pub const fn checked_add(self, other: usize) -> Option<NonZero<usize>>

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

Examples

let one = NonZero::new(1usize)?;
let two = NonZero::new(2usize)?;
let max = NonZero::new(usize::MAX)?;

assert_eq!(Some(two), one.checked_add(1));
assert_eq!(None, max.checked_add(1));

pub const fn saturating_add(self, other: usize) -> NonZero<usize>

Adds an unsigned integer to a non-zero value. Return NonZero::<usize>::MAX on overflow.

Examples

let one = NonZero::new(1usize)?;
let two = NonZero::new(2usize)?;
let max = NonZero::new(usize::MAX)?;

assert_eq!(two, one.saturating_add(1));
assert_eq!(max, max.saturating_add(1));

pub const unsafe fn unchecked_add(self, other: usize) -> NonZero<usize>

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

Adds an unsigned integer to a non-zero value, assuming overflow cannot occur. Overflow is unchecked, and it is undefined behavior to overflow even if the result would wrap to a non-zero value. The behavior is undefined as soon as self + rhs > usize::MAX.

Examples

#![feature(nonzero_ops)]

let one = NonZero::new(1usize)?;
let two = NonZero::new(2usize)?;

assert_eq!(two, unsafe { one.unchecked_add(1) });

pub const fn checked_next_power_of_two(self) -> Option<NonZero<usize>>

Returns the smallest power of two greater than or equal to self. Checks for overflow and returns None if the next power of two is greater than the type’s maximum value. As a consequence, the result cannot wrap to zero.

Examples

let two = NonZero::new(2usize)?;
let three = NonZero::new(3usize)?;
let four = NonZero::new(4usize)?;
let max = NonZero::new(usize::MAX)?;

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

pub const fn ilog2(self) -> u32

Returns the base 2 logarithm of the number, rounded down.

This is the same operation as usize::ilog2, except that it has no failure cases to worry about since this value can never be zero.

Examples

assert_eq!(NonZero::new(7usize)?.ilog2(), 2);
assert_eq!(NonZero::new(8usize)?.ilog2(), 3);
assert_eq!(NonZero::new(9usize)?.ilog2(), 3);

pub const fn ilog10(self) -> u32

Returns the base 10 logarithm of the number, rounded down.

This is the same operation as usize::ilog10, except that it has no failure cases to worry about since this value can never be zero.

Examples

assert_eq!(NonZero::new(99usize)?.ilog10(), 1);
assert_eq!(NonZero::new(100usize)?.ilog10(), 2);
assert_eq!(NonZero::new(101usize)?.ilog10(), 2);

pub const fn midpoint(self, rhs: NonZero<usize>) -> NonZero<usize>

Calculates the middle point of self and rhs.

midpoint(a, b) is (a + b) >> 1 as if it were performed in a sufficiently-large signed integral type. This implies that the result is always rounded towards negative infinity and that no overflow will ever occur.

Examples

let one = NonZero::new(1usize)?;
let two = NonZero::new(2usize)?;
let four = NonZero::new(4usize)?;

assert_eq!(one.midpoint(four), two);
assert_eq!(four.midpoint(one), two);

pub const fn is_power_of_two(self) -> bool

Returns true if and only if self == (1 << k) for some k.

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

Examples

Basic usage:

let eight = NonZero::new(8usize)?;
assert!(eight.is_power_of_two());
let ten = NonZero::new(10usize)?;
assert!(!ten.is_power_of_two());

pub const fn isqrt(self) -> NonZero<usize>

Returns the square root of the number, rounded down.

Examples

Basic usage:

let ten = NonZero::new(10usize)?;
let three = NonZero::new(3usize)?;

assert_eq!(ten.isqrt(), three);

pub const fn cast_signed(self) -> NonZero<isize>

Returns the bit pattern of self reinterpreted as a signed integer of the same size.

Examples

Basic usage:

let n = NonZero::<usize>::MAX;

assert_eq!(n.cast_signed(), NonZero::new(-1isize).unwrap());

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

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 = NonZero::new(2usize)?;
let four = NonZero::new(4usize)?;
let max = NonZero::new(usize::MAX)?;

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

pub const fn saturating_mul(self, other: NonZero<usize>) -> NonZero<usize>

Multiplies two non-zero integers together. Return NonZero::<usize>::MAX on overflow.

Examples

let two = NonZero::new(2usize)?;
let four = NonZero::new(4usize)?;
let max = NonZero::new(usize::MAX)?;

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

pub const unsafe fn unchecked_mul(self, other: NonZero<usize>) -> NonZero<usize>

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

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

Examples

#![feature(nonzero_ops)]

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

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

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

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 = NonZero::new(3usize)?;
let twenty_seven = NonZero::new(27usize)?;
let half_max = NonZero::new(usize::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) -> NonZero<usize>

Raise non-zero value to an integer power. Return NonZero::<usize>::MAX on overflow.

Examples

let three = NonZero::new(3usize)?;
let twenty_seven = NonZero::new(27usize)?;
let max = NonZero::new(usize::MAX)?;

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

Trait Implementations

impl BitSized<64> for NonZeroUsize

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 ExtNumConst for NonZeroUsize

const NUM_ZERO: Option<NonZeroUsize> = None

The additive identity (0), if applicable.

const NUM_ONE: NonZeroUsize

The multiplicative identity (1).

const NUM_TWO: NonZeroUsize

The only even prime and the fundamental doubling factor (2).

const NUM_THREE: NonZeroUsize

The smallest odd prime and the first nontrivial divisor (3).

const NUM_NEG_ONE: Option<NonZeroUsize> = None

The additive inverse of ONE (-1), if applicable.

const NUM_MIN_POSITIVE: NonZeroUsize

The smallest representable positive value.

const NUM_MAX_NEGATIVE: Option<NonZeroUsize> = None

The greatest representable negative value, if applicable.

const NUM_MAX_POWER_OF_TWO: NonZeroUsize

The maximum power of two within the type’s range.

type Num = NonZero<usize>

The underlying numeric type implementing this trait.

impl<T> Binary for NonZero<T>

where T: ZeroablePrimitive + Binary,

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

Formats the value using the given formatter.

impl<T> BitOr<NonZero<T>> for T

where T: ZeroablePrimitive + BitOr<Output = T>,

type Output = NonZero<T>

The resulting type after applying the | operator.

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

Performs the | operation.

impl<T> BitOr<T> for NonZero<T>

where T: ZeroablePrimitive + BitOr<Output = T>,

type Output = NonZero<T>

The resulting type after applying the | operator.

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

Performs the | operation.

impl<T> BitOr for NonZero<T>

where T: ZeroablePrimitive + BitOr<Output = T>,

type Output = NonZero<T>

The resulting type after applying the | operator.

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

Performs the | operation.

impl<T> BitOrAssign<T> for NonZero<T>

where T: ZeroablePrimitive, NonZero<T>: BitOr<T, Output = NonZero<T>>,

fn bitor_assign(&mut self, rhs: T)

Performs the |= operation.

impl<T> BitOrAssign for NonZero<T>

where T: ZeroablePrimitive, NonZero<T>: BitOr<Output = NonZero<T>>,

fn bitor_assign(&mut self, rhs: NonZero<T>)

Performs the |= operation.

impl CheckedBitPattern for NonZero<usize>

type Bits = usize

Self must have the same layout as the specified Bits except for the possible invalid bit patterns being checked during is_valid_bit_pattern.

fn is_valid_bit_pattern( bits: &<NonZero<usize> as CheckedBitPattern>::Bits, ) -> bool

If this function returns true, then it must be valid to reinterpret bits as &Self.

impl<T> Clone for NonZero<T>

where T: ZeroablePrimitive,

fn clone(&self) -> NonZero<T>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Contiguous for NonZero<usize>

const MAX_VALUE: usize = 18_446_744_073_709_551_615usize

The upper inclusive bound for valid instances of this type.

const MIN_VALUE: usize = 1usize

The lower inclusive bound for valid instances of this type.

type Int = usize

The primitive integer type with an identical representation to this type.

fn from_integer(value: Self::Int) -> Option<Self>

If value is within the range for valid instances of this type, returns Some(converted_value), otherwise, returns None.

fn into_integer(self) -> Self::Int

Perform the conversion from C into the underlying integral type. This mostly exists otherwise generic code would need unsafe for the value as integer

impl<T> Debug for NonZero<T>

where T: ZeroablePrimitive + Debug,

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for NonZero<usize>

fn deserialize<D>( deserializer: D, ) -> Result<NonZero<usize>, <D as Deserializer<'de>>::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<T> Display for NonZero<T>

where T: ZeroablePrimitive + Display,

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

Formats the value using the given formatter.

impl From<Alignment> for NonZero<usize>

fn from(align: Alignment) -> NonZero<usize>

Converts to this type from the input type.

impl From<CodecBe<NonZero<usize>>> for NonZero<usize>

fn from(be: CodecBe<NonZero<usize>>) -> Self

Converts to this type from the input type.

impl From<CodecLe<NonZero<usize>>> for NonZero<usize>

fn from(be: CodecLe<NonZero<usize>>) -> Self

Converts to this type from the input type.

impl<T> From<NonZero<T>> for T

where T: ZeroablePrimitive,

fn from(nonzero: NonZero<T>) -> T

Converts to this type from the input type.

impl From<NonZero<u16>> for NonZero<usize>

fn from(small: NonZero<u16>) -> NonZero<usize>

Converts NonZero<u16> to NonZero<usize> losslessly.

impl From<NonZero<u8>> for NonZero<usize>

fn from(small: NonZero<u8>) -> NonZero<usize>

Converts NonZero<u8> to NonZero<usize> losslessly.

impl FromPyObject<'_> for NonZero<usize>

fn extract_bound(obj: &Bound<'_, PyAny>) -> Result<NonZero<usize>, PyErr>

Extracts Self from the bound smart pointer obj.

impl FromStr for NonZero<usize>

type Err = ParseIntError

The associated error which can be returned from parsing.

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

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

impl<T> Hash for NonZero<T>

where T: ZeroablePrimitive + Hash,

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 IntoPy<Py<PyAny>> for NonZero<usize>

fn into_py(self, py: Python<'_>) -> Py<PyAny>

👎Deprecated since 0.23.0: IntoPy is going to be replaced by IntoPyObject. See the migration guide (https://pyo3.rs/v0.23.0/migration) for more information.

Performs the conversion.

impl<'py> IntoPyObject<'py> for NonZero<usize>

type Target = PyInt

The Python output type

type Output = Bound<'py, <NonZero<usize> as IntoPyObject<'py>>::Target>

The smart pointer type to use.

type Error = Infallible

The type returned in the event of a conversion error.

fn into_pyobject( self, py: Python<'py>, ) -> Result<<NonZero<usize> as IntoPyObject<'py>>::Output, <NonZero<usize> as IntoPyObject<'py>>::Error>

Performs the conversion.

impl<T> LowerExp for NonZero<T>

where T: ZeroablePrimitive + LowerExp,

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

Formats the value using the given formatter.

impl<T> LowerHex for NonZero<T>

where T: ZeroablePrimitive + LowerHex,

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

Formats the value using the given formatter.

impl<T> Octal for NonZero<T>

where T: ZeroablePrimitive + Octal,

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

Formats the value using the given formatter.

impl<T> Ord for NonZero<T>

where T: ZeroablePrimitive + Ord,

fn cmp(&self, other: &NonZero<T>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: NonZero<T>) -> NonZero<T>

Compares and returns the maximum of two values.

fn min(self, other: NonZero<T>) -> NonZero<T>

Compares and returns the minimum of two values.

fn clamp(self, min: NonZero<T>, max: NonZero<T>) -> NonZero<T>

Restrict a value to a certain interval.

impl<T> PartialEq for NonZero<T>

where T: ZeroablePrimitive + PartialEq,

fn eq(&self, other: &NonZero<T>) -> bool

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

fn ne(&self, other: &NonZero<T>) -> bool

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

impl<T> PartialOrd for NonZero<T>

where T: ZeroablePrimitive + PartialOrd,

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

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

fn lt(&self, other: &NonZero<T>) -> bool

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

fn le(&self, other: &NonZero<T>) -> bool

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

fn gt(&self, other: &NonZero<T>) -> bool

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

fn ge(&self, other: &NonZero<T>) -> bool

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

impl Serialize for NonZero<usize>

fn serialize<S>( &self, serializer: S, ) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl ToPyObject for NonZero<usize>

fn to_object(&self, py: Python<'_>) -> Py<PyAny>

👎Deprecated since 0.23.0: ToPyObject is going to be replaced by IntoPyObject. See the migration guide (https://pyo3.rs/v0.23.0/migration) for more information.

Converts self into a Python object.

impl TryFrom<NonZero<i128>> for NonZero<usize>

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

Attempts to convert NonZero<i128> to NonZero<usize>.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZero<i16>> for NonZero<usize>

fn try_from( value: NonZero<i16>, ) -> Result<NonZero<usize>, <NonZero<usize> as TryFrom<NonZero<i16>>>::Error>

Attempts to convert NonZero<i16> to NonZero<usize>.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZero<i32>> for NonZero<usize>

fn try_from( value: NonZero<i32>, ) -> Result<NonZero<usize>, <NonZero<usize> as TryFrom<NonZero<i32>>>::Error>

Attempts to convert NonZero<i32> to NonZero<usize>.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZero<i64>> for NonZero<usize>

fn try_from( value: NonZero<i64>, ) -> Result<NonZero<usize>, <NonZero<usize> as TryFrom<NonZero<i64>>>::Error>

Attempts to convert NonZero<i64> to NonZero<usize>.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZero<i8>> for NonZero<usize>

fn try_from( value: NonZero<i8>, ) -> Result<NonZero<usize>, <NonZero<usize> as TryFrom<NonZero<i8>>>::Error>

Attempts to convert NonZero<i8> to NonZero<usize>.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZero<isize>> for NonZero<usize>

fn try_from( value: NonZero<isize>, ) -> Result<NonZero<usize>, <NonZero<usize> as TryFrom<NonZero<isize>>>::Error>

Attempts to convert NonZero<isize> to NonZero<usize>.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZero<u128>> for NonZero<usize>

fn try_from( value: NonZero<u128>, ) -> Result<NonZero<usize>, <NonZero<usize> as TryFrom<NonZero<u128>>>::Error>

Attempts to convert NonZero<u128> to NonZero<usize>.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZero<u32>> for NonZero<usize>

fn try_from( value: NonZero<u32>, ) -> Result<NonZero<usize>, <NonZero<usize> as TryFrom<NonZero<u32>>>::Error>

Attempts to convert NonZero<u32> to NonZero<usize>.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZero<u64>> for NonZero<usize>

fn try_from( value: NonZero<u64>, ) -> Result<NonZero<usize>, <NonZero<usize> as TryFrom<NonZero<u64>>>::Error>

Attempts to convert NonZero<u64> to NonZero<usize>.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<usize> for NonZero<usize>

fn try_from( value: usize, ) -> Result<NonZero<usize>, <NonZero<usize> as TryFrom<usize>>::Error>

Attempts to convert usize to NonZero<usize>.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl<T> UpperExp for NonZero<T>

where T: ZeroablePrimitive + UpperExp,

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

Formats the value using the given formatter.

impl<T> UpperHex for NonZero<T>

where T: ZeroablePrimitive + UpperHex,

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

Formats the value using the given formatter.

impl Value for NonZero<usize>

fn record(&self, key: &Field, visitor: &mut dyn Visit)

Visits this value with the given Visitor.

impl Zeroize for NonZero<usize>

fn zeroize(&mut self)

Zero out this object from memory using Rust intrinsics which ensure the zeroization operation is not “optimized away” by the compiler.

impl<T> Copy for NonZero<T>

where T: ZeroablePrimitive,

impl<T> Eq for NonZero<T>

where T: ZeroablePrimitive + Eq,

impl<T> Freeze for NonZero<T>

where T: ZeroablePrimitive + Freeze,

impl NoUninit for NonZero<usize>

impl PodInOption for NonZero<usize>

impl<T> RefUnwindSafe for NonZero<T>

where T: ZeroablePrimitive + RefUnwindSafe,

impl<T> Send for NonZero<T>

where T: ZeroablePrimitive + Send,

impl<T> StructuralPartialEq for NonZero<T>

where T: ZeroablePrimitive + StructuralPartialEq,

impl<T> Sync for NonZero<T>

where T: ZeroablePrimitive + Sync,

impl<T> Unpin for NonZero<T>

where T: ZeroablePrimitive + Unpin,

impl<T> UnwindSafe for NonZero<T>

where T: ZeroablePrimitive + UnwindSafe,

impl ZeroableInOption for NonZero<usize>