Type Alias no_std_compat::num::NonZeroI16

1.34.0 · source ·

pub type NonZeroI16 = NonZero<i16>;

Expand description

An integer that is known not to equal zero.

This enables some memory layout optimization. For example, Option<NonZeroI16> is the same size as i16:

use std::mem::size_of;
assert_eq!(size_of::<Option<core::num::NonZeroI16>>(), size_of::<i16>());

§Layout

NonZeroI16 is guaranteed to have the same layout and bit validity as i16 with the exception that 0 is not a valid instance. Option<NonZeroI16> is guaranteed to be compatible with i16, including in FFI.

Thanks to the null pointer optimization, NonZeroI16 and Option<NonZeroI16> are guaranteed to have the same size and alignment:

use std::num::NonZeroI16;

assert_eq!(size_of::<NonZeroI16>(), size_of::<Option<NonZeroI16>>());
assert_eq!(align_of::<NonZeroI16>(), align_of::<Option<NonZeroI16>>());

Aliased Type§

struct NonZeroI16(/* private fields */);

Implementations

source §

impl<T> NonZero<T>
where T: ZeroablePrimitive,

1.28.0 (const: 1.47.0) · source

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

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

1.28.0 (const: 1.28.0) · source

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 behaviour if the value is zero.

§Safety

The value must not be zero.

source

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.

source

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.

1.28.0 (const: 1.34.0) · source

pub const fn get(self) -> T

Returns the contained value as a primitive type.

source §

impl NonZero<i16>

1.67.0 · source

pub const BITS: u32 = 16u32

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

This value is equal to i16::BITS.

§Examples

assert_eq!(NonZero::<i16>::BITS, i16::BITS);

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 = NonZero::<i16>::new(-1i16)?;

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

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 = NonZero::<i16>::new(0b0101000)?;

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

source

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::<i16>::new(0b100_0000)?;
let b = NonZero::<i16>::new(0b100_0011)?;

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

1.70.0 · source

pub const MIN: NonZero<i16> = _

The smallest value that can be represented by this non-zero integer type, equal to i16::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!(NonZero::<i16>::MIN.get(), i16::MIN);

1.70.0 · source

pub const MAX: NonZero<i16> = _

The largest value that can be represented by this non-zero integer type, equal to i16::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!(NonZero::<i16>::MAX.get(), i16::MAX);

1.64.0 (const: 1.64.0) · source

pub const fn abs(self) -> NonZero<i16>

Computes the absolute value of self. See i16::abs for documentation on overflow behaviour.

§Example

let pos = NonZero::new(1i16)?;
let neg = NonZero::new(-1i16)?;

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

1.64.0 (const: 1.64.0) · source

pub const fn checked_abs(self) -> Option<NonZero<i16>>

Checked absolute value. Checks for overflow and returns None if self == NonZero::<i16>::MIN. The result cannot be zero.

§Example

let pos = NonZero::new(1i16)?;
let neg = NonZero::new(-1i16)?;
let min = NonZero::new(i16::MIN)?;

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

1.64.0 (const: 1.64.0) · source

pub const fn overflowing_abs(self) -> (NonZero<i16>, bool)

Computes the absolute value of self, with overflow information, see i16::overflowing_abs.

§Example

let pos = NonZero::new(1i16)?;
let neg = NonZero::new(-1i16)?;
let min = NonZero::new(i16::MIN)?;

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

1.64.0 (const: 1.64.0) · source

pub const fn saturating_abs(self) -> NonZero<i16>

Saturating absolute value, see i16::saturating_abs.

§Example

let pos = NonZero::new(1i16)?;
let neg = NonZero::new(-1i16)?;
let min = NonZero::new(i16::MIN)?;
let min_plus = NonZero::new(i16::MIN + 1)?;
let max = NonZero::new(i16::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());

1.64.0 (const: 1.64.0) · source

pub const fn wrapping_abs(self) -> NonZero<i16>

Wrapping absolute value, see i16::wrapping_abs.

§Example

let pos = NonZero::new(1i16)?;
let neg = NonZero::new(-1i16)?;
let min = NonZero::new(i16::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());

1.64.0 (const: 1.64.0) · source

pub const fn unsigned_abs(self) -> NonZero<u16>

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

§Example

let u_pos = NonZero::new(1u16)?;
let i_pos = NonZero::new(1i16)?;
let i_neg = NonZero::new(-1i16)?;
let i_min = NonZero::new(i16::MIN)?;
let u_max = NonZero::new(u16::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());

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 = NonZero::new(5i16)?;
let neg_five = NonZero::new(-5i16)?;

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

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 = NonZero::new(5i16)?;
let neg_five = NonZero::new(-5i16)?;

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

1.71.0 (const: 1.71.0) · source

pub const fn checked_neg(self) -> Option<NonZero<i16>>

Checked negation. Computes -self, returning None if self == NonZero::<i16>::MIN.

§Example

let pos_five = NonZero::new(5i16)?;
let neg_five = NonZero::new(-5i16)?;
let min = NonZero::new(i16::MIN)?;

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

1.71.0 (const: 1.71.0) · source

pub const fn overflowing_neg(self) -> (NonZero<i16>, bool)

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

See i16::overflowing_neg for documentation on overflow behaviour.

§Example

let pos_five = NonZero::new(5i16)?;
let neg_five = NonZero::new(-5i16)?;
let min = NonZero::new(i16::MIN)?;

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

1.71.0 (const: 1.71.0) · source

pub const fn saturating_neg(self) -> NonZero<i16>

Saturating negation. Computes -self, returning NonZero::<i16>::MAX if self == NonZero::<i16>::MIN instead of overflowing.

§Example

let pos_five = NonZero::new(5i16)?;
let neg_five = NonZero::new(-5i16)?;
let min = NonZero::new(i16::MIN)?;
let min_plus_one = NonZero::new(i16::MIN + 1)?;
let max = NonZero::new(i16::MAX)?;

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

1.71.0 (const: 1.71.0) · source

pub const fn wrapping_neg(self) -> NonZero<i16>

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

See i16::wrapping_neg for documentation on overflow behaviour.

§Example

let pos_five = NonZero::new(5i16)?;
let neg_five = NonZero::new(-5i16)?;
let min = NonZero::new(i16::MIN)?;

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

1.64.0 (const: 1.64.0) · source

pub const fn checked_mul(self, other: NonZero<i16>) -> Option<NonZero<i16>>

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(2i16)?;
let four = NonZero::new(4i16)?;
let max = NonZero::new(i16::MAX)?;

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

1.64.0 (const: 1.64.0) · source

pub const fn saturating_mul(self, other: NonZero<i16>) -> NonZero<i16>

Multiplies two non-zero integers together. Return NonZero::<i16>::MAX on overflow.

§Examples

let two = NonZero::new(2i16)?;
let four = NonZero::new(4i16)?;
let max = NonZero::new(i16::MAX)?;

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

source

pub const unsafe fn unchecked_mul(self, other: NonZero<i16>) -> NonZero<i16>

🔬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 behaviour to overflow even if the result would wrap to a non-zero value. The behaviour is undefined as soon as self * rhs > i16::MAX, or self * rhs < i16::MIN.

§Examples

#![feature(nonzero_ops)]

let two = NonZero::new(2i16)?;
let four = NonZero::new(4i16)?;

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

1.64.0 (const: 1.64.0) · source

pub const fn checked_pow(self, other: u32) -> Option<NonZero<i16>>

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(3i16)?;
let twenty_seven = NonZero::new(27i16)?;
let half_max = NonZero::new(i16::MAX / 2)?;

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

1.64.0 (const: 1.64.0) · source

pub const fn saturating_pow(self, other: u32) -> NonZero<i16>

Raise non-zero value to an integer power. Return NonZero::<i16>::MIN or NonZero::<i16>::MAX on overflow.

§Examples

let three = NonZero::new(3i16)?;
let twenty_seven = NonZero::new(27i16)?;
let max = NonZero::new(i16::MAX)?;

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