Type Alias NonZeroU32

pub type NonZeroU32 = NonZero<u32>;

A u32 that is known not to equal zero.

This enables some memory layout optimization. For example, Option<NonZeroU32> is the same size as u32:

use std::mem::size_of;
assert_eq!(size_of::<Option<core::num::NonZeroU32>>(), size_of::<u32>());

Layout

NonZeroU32 is guaranteed to have the same layout and bit validity as u32 with the exception that 0 is not a valid instance. Option<NonZeroU32> is guaranteed to be compatible with u32, including in FFI.

Thanks to the null pointer optimization, NonZeroU32 and Option<NonZeroU32> are guaranteed to have the same size and alignment:

use std::num::NonZeroU32;

assert_eq!(size_of::<NonZeroU32>(), size_of::<Option<NonZeroU32>>());
assert_eq!(align_of::<NonZeroU32>(), align_of::<Option<NonZeroU32>>());

Aliased Type

struct NonZeroU32(/* 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<u32>

pub const fn div_ceil(self, rhs: NonZero<u32>) -> NonZero<u32>

🔬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(1u32).unwrap();
let max = NonZero::new(u32::MAX).unwrap();
assert_eq!(one.div_ceil(max), one);

let two = NonZero::new(2u32).unwrap();
let three = NonZero::new(3u32).unwrap();
assert_eq!(three.div_ceil(two), two);

impl NonZero<u32>

pub const BITS: u32 = 32u32

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

This value is equal to u32::BITS.

Examples

assert_eq!(NonZero::<u32>::BITS, u32::BITS);

pub const MIN: NonZero<u32>

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

Examples

assert_eq!(NonZero::<u32>::MIN.get(), 1u32);

pub const MAX: NonZero<u32>

The largest value that can be represented by this non-zero integer type, equal to u32::MAX.

Examples

assert_eq!(NonZero::<u32>::MAX.get(), u32::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::<u32>::new(u32::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::<u32>::new(0b0101000)?;

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

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

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

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

Examples

Basic usage:

#![feature(non_zero_count_ones)]

let a = NonZero::<u32>::new(0b100_0000)?;
let b = NonZero::<u32>::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<u32>

🔬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(0x10000b3u32)?;
let m = NonZero::new(0xb301)?;

assert_eq!(n.rotate_left(8), m);

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

🔬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(0xb301u32)?;
let m = NonZero::new(0x10000b3)?;

assert_eq!(n.rotate_right(8), m);

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

🔬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(0x12345678u32)?;
let m = n.swap_bytes();

assert_eq!(m, NonZero::new(0x78563412)?);

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

🔬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(0x12345678u32)?;
let m = n.reverse_bits();

assert_eq!(m, NonZero::new(0x1e6a2c48)?);

pub const fn from_be(x: NonZero<u32>) -> NonZero<u32>

🔬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::NonZeroU32;
let n = NonZero::new(0x1Au32)?;

if cfg!(target_endian = "big") {
    assert_eq!(NonZeroU32::from_be(n), n)
} else {
    assert_eq!(NonZeroU32::from_be(n), n.swap_bytes())
}

pub const fn from_le(x: NonZero<u32>) -> NonZero<u32>

🔬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::NonZeroU32;
let n = NonZero::new(0x1Au32)?;

if cfg!(target_endian = "little") {
    assert_eq!(NonZeroU32::from_le(n), n)
} else {
    assert_eq!(NonZeroU32::from_le(n), n.swap_bytes())
}

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

🔬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(0x1Au32)?;

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<u32>

🔬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(0x1Au32)?;

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: u32) -> Option<NonZero<u32>>

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(1u32)?;
let two = NonZero::new(2u32)?;
let max = NonZero::new(u32::MAX)?;

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

pub const fn saturating_add(self, other: u32) -> NonZero<u32>

Adds an unsigned integer to a non-zero value. Return NonZero::<u32>::MAX on overflow.

Examples

let one = NonZero::new(1u32)?;
let two = NonZero::new(2u32)?;
let max = NonZero::new(u32::MAX)?;

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

pub const unsafe fn unchecked_add(self, other: u32) -> NonZero<u32>

🔬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 > u32::MAX.

Examples

#![feature(nonzero_ops)]

let one = NonZero::new(1u32)?;
let two = NonZero::new(2u32)?;

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

pub const fn checked_next_power_of_two(self) -> Option<NonZero<u32>>

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(2u32)?;
let three = NonZero::new(3u32)?;
let four = NonZero::new(4u32)?;
let max = NonZero::new(u32::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 u32::ilog2, except that it has no failure cases to worry about since this value can never be zero.

Examples

assert_eq!(NonZero::new(7u32)?.ilog2(), 2);
assert_eq!(NonZero::new(8u32)?.ilog2(), 3);
assert_eq!(NonZero::new(9u32)?.ilog2(), 3);

pub const fn ilog10(self) -> u32

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

This is the same operation as u32::ilog10, except that it has no failure cases to worry about since this value can never be zero.

Examples

assert_eq!(NonZero::new(99u32)?.ilog10(), 1);
assert_eq!(NonZero::new(100u32)?.ilog10(), 2);
assert_eq!(NonZero::new(101u32)?.ilog10(), 2);

pub const fn midpoint(self, rhs: NonZero<u32>) -> NonZero<u32>

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(1u32)?;
let two = NonZero::new(2u32)?;
let four = NonZero::new(4u32)?;

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(8u32)?;
assert!(eight.is_power_of_two());
let ten = NonZero::new(10u32)?;
assert!(!ten.is_power_of_two());

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

Returns the square root of the number, rounded down.

Examples

Basic usage:

let ten = NonZero::new(10u32)?;
let three = NonZero::new(3u32)?;

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

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

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(2u32)?;
let four = NonZero::new(4u32)?;
let max = NonZero::new(u32::MAX)?;

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

pub const fn saturating_mul(self, other: NonZero<u32>) -> NonZero<u32>

Multiplies two non-zero integers together. Return NonZero::<u32>::MAX on overflow.

Examples

let two = NonZero::new(2u32)?;
let four = NonZero::new(4u32)?;
let max = NonZero::new(u32::MAX)?;

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

pub const unsafe fn unchecked_mul(self, other: NonZero<u32>) -> NonZero<u32>

🔬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 > u32::MAX.

Examples

#![feature(nonzero_ops)]

let two = NonZero::new(2u32)?;
let four = NonZero::new(4u32)?;

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

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

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(3u32)?;
let twenty_seven = NonZero::new(27u32)?;
let half_max = NonZero::new(u32::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<u32>

Raise non-zero value to an integer power. Return NonZero::<u32>::MAX on overflow.

Examples

let three = NonZero::new(3u32)?;
let twenty_seven = NonZero::new(27u32)?;
let max = NonZero::new(u32::MAX)?;

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

Trait Implementations

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<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<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<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<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<u32>

fn from(small: NonZero<u16>) -> NonZero<u32>

Converts NonZero<u16> to NonZero<u32> losslessly.

impl From<NonZero<u8>> for NonZero<u32>

fn from(small: NonZero<u8>) -> NonZero<u32>

Converts NonZero<u8> to NonZero<u32> losslessly.

impl FromStr for NonZero<u32>

type Err = ParseIntError

The associated error which can be returned from parsing.

fn from_str(src: &str) -> Result<NonZero<u32>, <NonZero<u32> 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<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 TryFrom<NonZero<i128>> for NonZero<u32>

fn try_from( value: NonZero<i128>, ) -> Result<NonZero<u32>, <NonZero<u32> as TryFrom<NonZero<i128>>>::Error>

Attempts to convert NonZero<i128> to NonZero<u32>.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZero<i16>> for NonZero<u32>

fn try_from( value: NonZero<i16>, ) -> Result<NonZero<u32>, <NonZero<u32> as TryFrom<NonZero<i16>>>::Error>

Attempts to convert NonZero<i16> to NonZero<u32>.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZero<i32>> for NonZero<u32>

fn try_from( value: NonZero<i32>, ) -> Result<NonZero<u32>, <NonZero<u32> as TryFrom<NonZero<i32>>>::Error>

Attempts to convert NonZero<i32> to NonZero<u32>.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZero<i64>> for NonZero<u32>

fn try_from( value: NonZero<i64>, ) -> Result<NonZero<u32>, <NonZero<u32> as TryFrom<NonZero<i64>>>::Error>

Attempts to convert NonZero<i64> to NonZero<u32>.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZero<i8>> for NonZero<u32>

fn try_from( value: NonZero<i8>, ) -> Result<NonZero<u32>, <NonZero<u32> as TryFrom<NonZero<i8>>>::Error>

Attempts to convert NonZero<i8> to NonZero<u32>.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZero<isize>> for NonZero<u32>

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

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

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZero<u128>> for NonZero<u32>

fn try_from( value: NonZero<u128>, ) -> Result<NonZero<u32>, <NonZero<u32> as TryFrom<NonZero<u128>>>::Error>

Attempts to convert NonZero<u128> to NonZero<u32>.

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<NonZero<u64>> for NonZero<u32>

fn try_from( value: NonZero<u64>, ) -> Result<NonZero<u32>, <NonZero<u32> as TryFrom<NonZero<u64>>>::Error>

Attempts to convert NonZero<u64> to NonZero<u32>.

type Error = TryFromIntError

The type returned in the event of a conversion error.

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

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

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

type Error = TryFromIntError

The type returned in the event of a conversion error.

impl TryFrom<u32> for NonZero<u32>

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

Attempts to convert u32 to NonZero<u32>.

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<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<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,