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.

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

Returns the value as a primitive type.

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::NonZeroI32::new(-1i32).unwrap();

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

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::NonZeroI32::new(0b0101000).unwrap();

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

Computes the absolute value of self. See i32::abs for documentation on overflow behaviour.

Example

let pos = NonZeroI32::new(1)?;
let neg = NonZeroI32::new(-1)?;

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

Checked absolute value. Checks for overflow and returns None if self == NonZeroI32::MIN. The result cannot be zero.

Example

let pos = NonZeroI32::new(1)?;
let neg = NonZeroI32::new(-1)?;
let min = NonZeroI32::new(i32::MIN)?;

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

Computes the absolute value of self, with overflow information, see i32::overflowing_abs.

Example

let pos = NonZeroI32::new(1)?;
let neg = NonZeroI32::new(-1)?;
let min = NonZeroI32::new(i32::MIN)?;

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

Saturating absolute value, see i32::saturating_abs.

Example

let pos = NonZeroI32::new(1)?;
let neg = NonZeroI32::new(-1)?;
let min = NonZeroI32::new(i32::MIN)?;
let min_plus = NonZeroI32::new(i32::MIN + 1)?;
let max = NonZeroI32::new(i32::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());

Wrapping absolute value, see i32::wrapping_abs.

Example

let pos = NonZeroI32::new(1)?;
let neg = NonZeroI32::new(-1)?;
let min = NonZeroI32::new(i32::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());

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

Example

let u_pos = NonZeroU32::new(1)?;
let i_pos = NonZeroI32::new(1)?;
let i_neg = NonZeroI32::new(-1)?;
let i_min = NonZeroI32::new(i32::MIN)?;
let u_max = NonZeroU32::new(u32::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());

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

Example

let pos_five = NonZeroI32::new(5)?;
let neg_five = NonZeroI32::new(-5)?;

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

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

Example

let pos_five = NonZeroI32::new(5)?;
let neg_five = NonZeroI32::new(-5)?;

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

Checked negation. Computes -self, returning None if self == NonZeroI32::MIN.

Example

let pos_five = NonZeroI32::new(5)?;
let neg_five = NonZeroI32::new(-5)?;
let min = NonZeroI32::new(i32::MIN)?;

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

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

See i32::overflowing_neg for documentation on overflow behaviour.

Example

let pos_five = NonZeroI32::new(5)?;
let neg_five = NonZeroI32::new(-5)?;
let min = NonZeroI32::new(i32::MIN)?;

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

Saturating negation. Computes -self, returning NonZeroI32::MAX if self == NonZeroI32::MIN instead of overflowing.

Example

let pos_five = NonZeroI32::new(5)?;
let neg_five = NonZeroI32::new(-5)?;
let min = NonZeroI32::new(i32::MIN)?;
let min_plus_one = NonZeroI32::new(i32::MIN + 1)?;
let max = NonZeroI32::new(i32::MAX)?;

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

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

See i32::wrapping_neg for documentation on overflow behaviour.

Example

let pos_five = NonZeroI32::new(5)?;
let neg_five = NonZeroI32::new(-5)?;
let min = NonZeroI32::new(i32::MIN)?;

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

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 = NonZeroI32::new(2)?;
let four = NonZeroI32::new(4)?;
let max = NonZeroI32::new(i32::MAX)?;

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

Multiplies two non-zero integers together. Return NonZeroI32::MAX on overflow.

Examples

let two = NonZeroI32::new(2)?;
let four = NonZeroI32::new(4)?;
let max = NonZeroI32::new(i32::MAX)?;

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

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 > i32::MAX, or self * rhs < i32::MIN.

Examples

#![feature(nonzero_ops)]

let two = NonZeroI32::new(2)?;
let four = NonZeroI32::new(4)?;

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

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 = NonZeroI32::new(3)?;
let twenty_seven = NonZeroI32::new(27)?;
let half_max = NonZeroI32::new(i32::MAX / 2)?;

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

Raise non-zero value to an integer power. Return NonZeroI32::MIN or NonZeroI32::MAX on overflow.

Examples

let three = NonZeroI32::new(3)?;
let twenty_seven = NonZeroI32::new(27)?;
let max = NonZeroI32::new(i32::MAX)?;

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

The smallest value that can be represented by this non-zero integer type, equal to i32::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!(NonZeroI32::MIN.get(), i32::MIN);

The largest value that can be represented by this non-zero integer type, equal to i32::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!(NonZeroI32::MAX.get(), i32::MAX);

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

This value is equal to i32::BITS.

Examples

assert_eq!(NonZeroI32::BITS, i32::BITS);

Converts NonZeroI16 to NonZeroI32 losslessly.

Converts NonZeroI32 to NonZeroI128 losslessly.

Converts NonZeroI32 to NonZeroI64 losslessly.

Converts a NonZeroI32 into an i32

Converts NonZeroI8 to NonZeroI32 losslessly.

Converts NonZeroU16 to NonZeroI32 losslessly.

Converts NonZeroU8 to NonZeroI32 losslessly.

Attempts to convert NonZeroI128 to NonZeroI32.

Attempts to convert NonZeroI32 to NonZeroI16.

Attempts to convert NonZeroI32 to NonZeroI8.

Attempts to convert NonZeroI32 to NonZeroIsize.

Attempts to convert NonZeroI32 to NonZeroU128.

Attempts to convert NonZeroI32 to NonZeroU16.

Attempts to convert NonZeroI32 to NonZeroU32.

Attempts to convert NonZeroI32 to NonZeroU64.

Attempts to convert NonZeroI32 to NonZeroU8.

Attempts to convert NonZeroI32 to NonZeroUsize.

Attempts to convert NonZeroI64 to NonZeroI32.

Attempts to convert NonZeroIsize to NonZeroI32.

Attempts to convert NonZeroU128 to NonZeroI32.

Attempts to convert NonZeroU32 to NonZeroI32.

Attempts to convert NonZeroU64 to NonZeroI32.

Attempts to convert NonZeroUsize to NonZeroI32.

Attempts to convert i32 to NonZeroI32.

Returns the argument unchanged.

Calls U::from(self).

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